CN112698282A - Internal calibration device and internal calibration method for DBF satellite-borne SAR system - Google Patents
Internal calibration device and internal calibration method for DBF satellite-borne SAR system Download PDFInfo
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Abstract
The embodiment of the application discloses calibration device in DBF satellite-borne SAR system, the device includes: the internal calibration module and the data fusion module; the inner calibration module receives a calibration signal, performs frequency conversion on the calibration signal, and outputs the calibration signal after the frequency conversion; and the data fusion module receives the frequency-converted calibration signal, converts the frequency-converted calibration signal into a digital calibration signal and performs calibration according to the digital calibration signal. In addition, the embodiment of the application also discloses an internal calibration method suitable for the DBF satellite-borne SAR system.
Description
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to but not limited to a calibration device and a calibration method in a Digital Beam Forming (DBF) satellite-borne Synthetic Aperture Radar (SAR) system.
Background
The receiving and transmitting path characteristics of the satellite-borne SAR system are influenced by factors such as temperature change, and the like, certain uncertainty exists, and the uncertainty can influence the SAR image radiometric calibration precision and the image distance pulse compression effect.
The internal calibration is introduced into the satellite-borne SAR system for solving the problems, and the implementation method is that equipment specially used for calibration is configured in the system, the communication is established between the receiving and transmitting channels of the system, the characteristics of the whole active receiving and transmitting channel except the antenna array are calibrated, and corresponding compensation is carried out according to the calibration result during ground imaging processing.
For a phased array spaceborne SAR system, the conventional internal calibration design scheme comprises the following steps: and adding an inner calibrator and an antenna calibration network outside a normal radar transceiving channel. However, after the DBF technology is adopted, the composition of the receiving and transmitting channels of the satellite-borne SAR system and the conventional system are greatly changed, and the internal calibration design scheme is not applicable.
In the related art, an internal calibration design scheme of an optional DBF spaceborne SAR system includes: the design scheme of adding a plurality of electronic switches and a plurality of high-frequency cables between each DBF receiving module and a transceiving channel is much more complicated than the conventional internal standard design scheme.
Disclosure of Invention
In view of this, embodiments of the present application provide a scaling device and an internal scaling method in a DBF space-borne SAR system to solve at least one problem in the related art, and implement receiving and collecting of a scaling signal by introducing a separate scaling receiving channel, thereby avoiding introducing a plurality of electronic switches and a plurality of high-frequency cables, and simplifying an internal scaling scheme.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a calibration device in a DBF space-borne SAR system, where the device includes: the internal calibration module and the data fusion module;
the inner calibration module receives a calibration signal, performs frequency conversion on the calibration signal, and outputs the calibration signal after the frequency conversion;
and the data fusion module receives the frequency-converted calibration signal, converts the frequency-converted calibration signal into a digital calibration signal and performs calibration according to the digital calibration signal.
In a second aspect, an embodiment of the present application provides an internal calibration method, where the method includes:
receiving a calibration signal through an inner calibration module, and carrying out frequency conversion on the calibration signal;
and converting the frequency-converted calibration signal into a digital calibration signal through a data fusion module, and calibrating according to the digital calibration signal.
In an embodiment of the present application, the calibration apparatus in the DBF space-borne SAR system includes: the internal calibration module and the data fusion module; the inner calibration module receives a calibration signal, performs frequency conversion on the calibration signal, and outputs the calibration signal after the frequency conversion; the data fusion module receives the frequency-converted calibration signal, converts the frequency-converted calibration signal into a digital calibration signal and performs calibration according to the digital calibration signal; therefore, the calibration signal is received in a frequency conversion mode and converted into the digital calibration signal, so that the calibration signal is received and collected, and the internal calibration scheme is simplified.
Drawings
Fig. 1 is a schematic structural diagram of a first component of a scaling device in a DBF space-borne SAR system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a component of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a third component of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a component of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a component of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram six of a component of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application;
fig. 7 is a schematic flow chart illustrating an implementation of an internal calibration method according to an embodiment of the present application;
fig. 8 is a schematic diagram seven of a composition structure of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application;
fig. 9 is a schematic structural diagram eight illustrating a composition structure of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application;
fig. 10 is a schematic structural diagram nine of a component of a scaling device in a DBF space-borne SAR system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will describe the specific technical solutions of the present application in further detail with reference to the accompanying drawings in the embodiments of the present application. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
In describing the embodiments of the present application in detail, the cross-sectional views illustrating the structure of the device are not enlarged partially in a general scale for convenience of illustration, and the schematic drawings are only examples, which should not limit the scope of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
An embodiment of the present application provides a calibration device in a DBF space-borne SAR system, as shown in fig. 1, the calibration device 100 in the DBF space-borne SAR system includes: an inner scaling module 101 and a data fusion module 102.
And the inner calibration module 101 is configured to receive a calibration signal, perform frequency conversion on the calibration signal, and output the frequency-converted calibration signal.
And the data fusion module 102 is configured to receive the frequency-converted calibration signal output by the inner calibration module 101, convert the frequency-converted calibration signal into a digital calibration signal, and perform calibration according to the digital calibration signal.
Here, the internal calibration module 101 is connected to the data fusion module 102, and the internal calibration module 101 transmits the frequency-converted calibration signal to the data fusion module 102 through the connection. The inner calibration module 101 may include a calibration receiving unit, and the data fusion module 102 may include a calibration acquiring unit, which may be wired to the calibration acquiring unit.
And receiving the calibration signal through the calibration receiving unit, carrying out frequency conversion on the calibration signal, and outputting the calibration signal after frequency conversion.
And the calibration acquisition unit is used for receiving the frequency-converted calibration signal output by the calibration receiving unit, converting the frequency-converted calibration signal into a digital calibration signal and calibrating according to the digital calibration signal.
In an embodiment of the present application, the apparatus includes: the internal calibration module and the data fusion module; the inner calibration module receives a calibration signal, performs frequency conversion on the calibration signal, and outputs the calibration signal after the frequency conversion; the data fusion module receives the frequency-converted calibration signal, converts the frequency-converted calibration signal into a digital calibration signal and performs calibration according to the digital calibration signal; therefore, the calibration signal is received in a frequency conversion mode and converted into a digital calibration signal, so that the calibration signal is received and collected, and an internal calibration scheme is simplified.
In one embodiment, as shown in fig. 2, the apparatus 100 further comprises: a frequency modulated signal generation module 103; and the frequency modulation signal generation module 103 is configured to generate a linear frequency modulation signal.
Here, the fm signal generating module 103 is connected to the inner calibration module 101, the fm signal generating module 103 generates a chirp signal, and the fm signal generating module 103 transmits the generated chirp signal to the inner calibration module 101 directly or indirectly as a calibration signal.
In one example, the chirp generation module 103 sends the chirp signal directly to the inner scaling module as a scaled signal. In an example, the fm signal generating module 103 sends the chirp signal to the antenna array module, and the antenna array module processes the chirp signal to obtain a calibration signal and transmits the calibration signal to the internal calibration module.
In the embodiment of the application, the chirp signal generation module generates a chirp signal, the chirp signal is transmitted to the internal calibration module, subjected to frequency conversion processing of the internal calibration module and then transmitted to the data fusion module, an internal calibration scheme is realized, and a chirp signal is provided for the internal calibration scheme.
In an embodiment, as shown in fig. 2, in the reference scaling mode, the fm signal generating module 103 transmits the chirp signal to the inner scaling module 101 as a first scaling signal, where the scaling signal includes: the first scaling signal of the scaling mode is referenced. In the embodiment of the present application, the scaling signal of the reference scaling mode is referred to as a first scaling signal.
Here, in the reference scaling mode, the reference scaling path of the apparatus includes: the system comprises a frequency modulation signal generation module 103, an internal calibration module 101 and a data fusion module 102. The frequency modulation signal generation module 103 is connected with the internal calibration module 101, and the internal calibration module 101 is connected with the data fusion module 102.
Here, the fm signal generating module 103 generates a chirp signal, the fm signal generating module 103 transmits the generated chirp signal to the inner calibration module 101 as a first calibration signal, and the inner calibration module 101 receives the first calibration signal transmitted by the fm signal generating module 103, performs frequency conversion on the first calibration signal, and outputs the frequency-converted first calibration signal. The chirp signal in the reference scaling mode is referred to as a first scaling signal in the present application.
Here, the data fusion module 102 receives the frequency-converted first scaling signal transmitted by the inner scaling module 101, converts the frequency-converted first scaling signal into a digital scaling signal, and performs scaling according to the digital scaling signal.
In the embodiment of the application, a reference calibration path of a calibration device in a DBF space-borne SAR system in a reference calibration mode comprises: the frequency modulation signal generation module, the internal calibration module and the data fusion module are connected with the data fusion module; the frequency modulation signal generation module generates a linear frequency modulation signal, the linear frequency modulation signal is transmitted to the internal calibration module as a first calibration signal, the first calibration signal after frequency conversion is obtained through processing of the internal calibration module, and then the first calibration signal is transmitted to the data fusion module to obtain a digital calibration signal.
In one embodiment, as shown in fig. 3, the apparatus 100 further comprises: an antenna array module 104; in the transmit scaling mode, the fm signal generation module 103 transmits the chirp signal as a transmit signal to the antenna array module 104; the antenna array module 104 receives the transmitting signal, couples and outputs the transmitting signal to obtain a second scaling signal, and transmits the second scaling signal to the inner scaling module 101. At this time, the scaling signal includes: a second scaled signal of the scaled mode is transmitted.
Here, the fm signal generating module 103 is connected to the antenna array module 104, the antenna array module 104 is connected to the inner calibration module 101, the inner calibration module 101 is connected to the data fusion module 102, and the signal transmission path is: a frequency modulation signal generating module 103, an antenna array module 104, an internal calibration module 101 and a data fusion module 102.
Here, the transmission scaling path in the transmission scaling mode includes: a frequency modulation signal generating module 103, an antenna array module 104, an internal calibration module 101 and a data fusion module 102.
The fm signal generating module 103 generates a linear fm signal, the fm signal generating module 103 transmits the generated linear fm signal to the antenna array module 104 as a transmitting signal, the antenna array module 104 receives the transmitting signal transmitted by the fm signal generating module 103, and performs coupling output and power synthesis on the transmitting signal to obtain a second scaling signal, the second scaling signal is transmitted to the inner scaling module 101, the inner scaling module 101 receives the second scaling signal, performs frequency conversion on the second scaling signal, and outputs the frequency-converted second scaling signal to the data fusion module 102; the data fusion module 102 receives the frequency-converted second scaling signal, converts the frequency-converted second scaling signal into a digital scaling signal, and performs scaling according to the digital scaling signal.
In an embodiment of the present application, a transmit scaling path in a transmit scaling mode includes: the system comprises a frequency modulation signal generation module, an antenna array module, an internal calibration module and a data fusion module; the frequency modulation signal generation module generates a linear frequency modulation signal, the linear frequency modulation signal is transmitted to the antenna array module and the inner calibration module as a transmitting signal, a second calibration signal after frequency conversion is obtained through the processing of the antenna array module and the inner calibration module, and then the second calibration signal is transmitted to the data fusion module to obtain a digital calibration signal, so that the calibration of a transmitting calibration channel in the inner calibration scheme is realized.
In one embodiment, as shown in fig. 4, the antenna array module 104 includes: an antenna transceiving unit 1041 and an antenna scaling network unit 1042. The antenna transceiving unit 1041 includes a plurality of transceiving components.
In practical applications, the antenna transceiving unit includes a plurality of transceiving components, and each transceiving component includes at least one transceiving path. And in the transmitting scaling mode, a transmitting path in the transceiving path is in an operating state.
And an antenna transceiver unit 1041, configured to receive a transmission signal, and couple and output the transmission signal to the antenna network calibration unit through each transceiver component after power distribution.
The antenna scaling network unit 1042 is configured to perform power synthesis on the transmit signals coupled and output by different transceiver components to obtain the second scaling signal, and send the second scaling signal to the internal scaling module number.
Here, the antenna transceiving unit 1041 and the antenna scaling network unit 1042 are connected. The antenna transceiver unit performs power distribution and power amplification on the transmit signal, and couples the transmit signal transmitted by the path corresponding to each transceiver component to the antenna scaling network unit 1042. The antenna scaling network unit 1042 performs power synthesis on the received transmission signals coupled and output by each transceiver module to obtain a signal, i.e. a second scaling signal.
Here, the transmission scaling path in the transmission scaling mode includes: the device comprises a frequency modulation signal generating module 103, an antenna transceiving unit 1041, an antenna scaling network unit 1042, an inner scaling module 101 and a data fusion module 102.
Here, the fm signal generating module 103 generates a chirp signal, the fm signal generating module 103 transmits the generated chirp signal to the antenna transceiver unit 1041 as a transmission signal, the antenna transceiver unit 1041 receives the transmission signal transmitted by the fm signal generating module 103, performs power distribution and power amplification on the transmission signal, and couples and outputs the transmission signal of each channel to the antenna scaling network unit 1042; the antenna scaling network unit 1042 synthesizes power of the received transmission signal to obtain a second scaling signal, transmits the second scaling signal to the inner scaling module 101, and the inner scaling module 101 receives the second scaling signal, performs frequency conversion on the second scaling signal, and outputs the frequency-converted second scaling signal to the data fusion module 102; the data fusion module 102 receives the frequency-converted second scaling signal, converts the frequency-converted second scaling signal into a digital scaling signal, and performs scaling according to the digital scaling signal.
In an embodiment of the present application, in the transmission scaling mode, a transmission scaling path of the apparatus includes: the system comprises a frequency modulation signal generation module, an antenna transceiving unit, an antenna calibration network unit, an internal calibration module and a data fusion module; the frequency modulation signal generation module generates a linear frequency modulation signal, the linear frequency modulation signal is transmitted to the antenna transceiving unit, the antenna calibration network unit and the internal calibration module as a transmitting signal, a second calibration signal after frequency conversion is obtained through the processing of the antenna transceiving unit, the antenna calibration network unit and the internal calibration module, and then the second calibration signal is transmitted to the data fusion module to obtain a digital calibration signal, so that the calibration of a transmitting calibration channel in the internal calibration scheme is realized.
In one embodiment, as shown in fig. 5, the apparatus comprises: the DBF reception processing module 105; and a DBF receiving processing module 105, configured to perform scaling in a receiving scaling mode.
Here, the inner calibration module receives the chirp signal in a receive calibration mode and sends the chirp signal to the antenna array module as a third calibration signal;
the antenna array module amplifies the third scaling signal and transmits the amplified third scaling signal to the DBF receiving and processing module;
and the DBF receiving and processing module is used for carrying out frequency conversion and amplification on the amplified third calibration signal, converting the amplified third calibration signal into a digital calibration signal and carrying out calibration according to the digital calibration signal.
In practical applications, the antenna array module includes a plurality of signal transceiving paths, and in the transmit scaling mode, the signal transceiving paths are used as transmit paths, and in the receive scaling mode, the signal transceiving paths are used as receive paths.
In one embodiment, as shown in fig. 5, in the receiving scaling mode, the fm signal generating module 103 transmits the chirp signal as a third scaling signal to the inner scaling module 101; the inner scaling module 101 receives the third scaling signal and transmits it to the antenna array module 104; the antenna array module 104 amplifies the third calibration signal and transmits the amplified third calibration signal to the DBF receiving and processing module 105; the DBF receiving processing module 105 performs frequency conversion and amplification on the received third scaling signal, converts the third scaling signal into a digital scaling signal, and performs scaling according to the digital scaling signal.
Here, in the reception scaling mode, the reception scaling path of the apparatus includes: a frequency modulation signal generating module 103, an internal calibration module 101, an antenna array module 104 to a DBF receiving processing module 105; the fm signal generating module 103 is connected to the inner calibration module 101, the inner calibration module 101 is connected to the antenna array module 104, and the antenna array module 104 is connected to the DBF receiving and processing module 105.
In one example, as shown in fig. 6, the antenna array module 104 includes: an antenna transceiving unit 1041 and an antenna scaling network unit 1042; the antenna scaling network unit 1042 is connected to the antenna transceiver unit 1041, and the antenna scaling network unit 1042 transmits the chirp signal to the antenna transceiver unit 1041.
Here, the antenna scaling network unit performs power distribution on the third scaling signal and transmits the third scaling signal to the antenna transceiver unit; and the antenna transceiving unit amplifies and power-synthesizes the third calibration signal after power distribution and transmits the third calibration signal to the DBF receiving and processing module.
Here, the fm signal generation module 103 transmits the chirp signal to the inner calibration module 101 as a third calibration signal; the inner scaling module 101 receives the third scaling signal and transmits the third scaling signal to the antenna scaling network unit 1042; the antenna scaling network unit 1042 receives a third scaling signal, distributes power of the third scaling signal, and transmits the third scaling signal to the antenna transceiver unit 1041; the antenna transceiver 1041 receives the third scaling signal after power distribution, and transmits the amplified third scaling signal to the DBF receive processing module 105; the DBF receiving and processing module 105 converts and amplifies the third scaling signal into a digital scaling signal, and scales according to the digital scaling signal.
In an embodiment of the present application, a receive scaling path in a receive scaling mode includes: the system comprises a frequency modulation signal generating module, an internal calibration module, an antenna array module and a DBF receiving and processing module; the frequency modulation signal generating module generates a linear frequency modulation signal, the linear frequency modulation signal is transmitted to the inner calibration module, the antenna array module and the DBF receiving and processing module as a third calibration signal, and the digital calibration signal is obtained through the processing of the inner calibration module, the antenna array module and the DBF receiving and processing module, so that the calibration of a receiving calibration channel in the inner calibration scheme is realized.
Embodiments of the internal calibration method, device and storage medium provided by the embodiments of the present application are described below with reference to a schematic diagram of an internal calibration device in a DBF space-borne SAR system shown in fig. 1.
The embodiment of the application provides an internal calibration method, which is applied to a calibration device in a DBF (digital broadcast receiver) spaceborne SAR (synthetic aperture radar) system, wherein the calibration device in the DBF spaceborne SAR system can be computer equipment. The functions implemented by the method may be implemented by calling program code by a processor in a computer device, which may, of course, be stored in a computer storage medium, which may comprise at least a processor and a storage medium.
Based on the internal calibration device in the DBF space-borne SAR system shown in fig. 1, an embodiment of the present application provides an internal calibration method, as shown in fig. 7, the method may include the following steps:
s701, receiving a calibration signal through an inner calibration module, and carrying out frequency conversion on the calibration signal;
here, the calibration device in the DBF space-borne SAR system comprises: the system comprises an inner calibration module and a data fusion module; the internal calibration module is connected with the data fusion module; and receiving the calibration signal through the inner calibration module, carrying out frequency conversion on the received calibration signal, and outputting the calibration signal after frequency conversion.
Here, the inner calibration module receives the calibration signal in a transmission calibration mode or a reference calibration mode, performs frequency conversion on the received calibration signal, transmits the frequency-converted calibration signal to the data fusion module, and the data fusion module converts the frequency-converted calibration signal into a data calibration signal.
In an embodiment, a chirp signal is generated by the chirp signal generation module, and the chirp signal is used to obtain the scaling signal.
The inner calibration module can directly receive the chirp signals from the frequency modulation signal generation module as calibration signals, and can also receive the chirp signals generated by the frequency modulation signal generation module through other modules, and the received signals are the chirp signals processed by other modules.
In the embodiment of the present application, as shown in fig. 2, the apparatus 100 further includes: a frequency modulated signal generation module 103; and the frequency modulation signal generation module 103 is configured to generate a linear frequency modulation signal.
In one example, the chirp generation module 103 sends the chirp signal directly to the inner scaling module as a scaled signal.
In an example, the fm signal generating module 103 sends the chirp signal to the antenna array module, and the antenna array module processes the chirp signal to obtain a calibration signal and transmits the calibration signal to the internal calibration module.
Here, the scaling signal includes: and transmitting a second scaling signal in the scaling mode by referring to the first scaling signal in the scaling mode. And the first calibration signal in the reference calibration mode or the second calibration signal in the emission calibration mode is transmitted to the data fusion module, and the third calibration signal in the receiving calibration mode is transmitted to the DBF receiving and processing module.
S702, converting the frequency-converted calibration signal into a digital calibration signal through a data fusion module, and calibrating according to the digital calibration signal.
After the frequency-converted calibration signal is transmitted to the data fusion module, the frequency-converted calibration signal transmitted by the inner calibration module is received by the data fusion module, the frequency-converted calibration signal is converted into a digital calibration signal, and calibration is performed according to the digital calibration signal.
In an embodiment of the present application, the internal calibration method includes: receiving a calibration signal through an inner calibration module, carrying out frequency conversion on the calibration signal, and outputting the calibration signal after frequency conversion; the data fusion module receives the calibration signal after frequency conversion, converts the calibration signal after frequency conversion into a digital calibration signal, and calibrates according to the digital calibration signal, so that the emission calibration signal is received through frequency conversion of the emission calibration signal and converted into the digital calibration signal, and the emission calibration signal is received and collected. Therefore, the receiving and the acquisition of the emission calibration signal and the reference calibration signal are realized by introducing a separate calibration receiving channel, the introduction of a plurality of electronic switches and a plurality of high-frequency cables is avoided, and the internal calibration scheme of the DBF satellite-borne SAR is simplified.
In an embodiment, in the reference scaling mode, the chirp signal is transmitted as the first scaling signal to the inner scaling module by the chirp signal generation module.
Here, in the reference scaling mode, the fm signal generation module, the inner scaling module, and the data fusion module form a reference scaling path.
Generating a linear frequency modulation signal through a frequency modulation signal generating module, and transmitting the linear frequency modulation signal to an inner calibration module as a first calibration signal; the method comprises the steps of receiving a first calibration signal through an inner calibration module, carrying out frequency conversion on the first calibration signal, and outputting the frequency-converted first calibration signal to a data fusion module. And receiving the frequency-converted first calibration signal through a data fusion module, converting the frequency-converted first calibration signal into a digital calibration signal, and calibrating according to the digital calibration signal.
In the embodiment of the application, a linear frequency modulation signal is generated by a frequency modulation signal generation module, the linear frequency modulation signal is processed by an inner calibration module and a data fusion module to obtain a digital calibration signal, and calibration is performed according to the digital calibration signal, so that calibration of a reference calibration channel is realized.
In an embodiment, in the transmission scaling mode, the chirp signal is transmitted to the antenna array module as a transmission signal through the chirp signal generation module, and a second scaling signal is obtained by coupling and outputting the transmission signal through the antenna array module, and the second scaling signal is transmitted to the inner scaling module.
Here, in the transmit scaling mode, the fm signal generation module, the antenna array module, the internal scaling module, and the data fusion module form a transmit scaling path.
Here, a chirp signal is generated by the chirp signal generation module and transmitted as a transmission signal to the antenna array module;
and receiving the transmitting signal through the antenna array module, coupling and outputting the transmitting signal to form a second calibration signal, and transmitting the second calibration signal to the inner calibration module.
And receiving a second calibration signal through the inner calibration module, carrying out frequency conversion on the second calibration signal, and outputting the second calibration signal after frequency conversion to the data fusion module.
And receiving the second calibration signal after frequency conversion through a data fusion module, converting the second calibration signal after frequency conversion into a digital calibration signal, and calibrating according to the digital calibration signal.
In the embodiment of the application, a linear frequency modulation signal is generated by a frequency modulation signal generation module, the linear frequency modulation signal is processed by an antenna array module, an inner calibration module and a data fusion module to obtain a digital calibration signal, and calibration is performed according to the digital calibration signal, so that calibration of a transmitting calibration channel is realized.
In an example, in the receive scaling mode, the apparatus further comprises: and the DBF receives the processing module. The frequency modulation signal generation module, the inner calibration module, the antenna array module and the DBF receiving and processing module form a receiving calibration channel. Wherein, the antenna array module includes: the antenna calibration system comprises an antenna transceiving unit and an antenna calibration network unit; in the receiving calibration mode, the antenna transceiving unit is used for receiving the linear frequency modulation signal; the antenna scaling network unit transmits the chirp signal to the antenna transceiving unit.
Generating a linear frequency modulation signal through a frequency modulation signal generating module, and transmitting the linear frequency modulation signal to an inner calibration module as a third calibration signal;
and receiving a third calibration signal through the inner calibration module and transmitting the third calibration signal to the antenna array module.
Amplifying the third calibration signal through an antenna array module and transmitting the amplified third calibration signal to a DBF receiving and processing module;
and the amplified third scaling signal is subjected to frequency conversion and amplification through the DBF receiving and processing module, and is converted into a digital scaling signal, and scaling is performed according to the digital scaling signal.
In the embodiment of the application, a linear frequency modulation signal is generated by a frequency modulation signal generation module, the linear frequency modulation signal is processed by an inner calibration module, an antenna array module and a DBF receiving and processing module to obtain a digital calibration signal, and calibration is performed according to the digital calibration signal, so that calibration of a receiving calibration channel is realized.
The internal calibration device and the internal calibration method for the DBF spaceborne SAR system provided by the embodiment of the present application are further described below by taking an internal calibration scheme of the DBF spaceborne SAR system as an example.
In the related technology, because the characteristics of the receiving and transmitting path of the satellite-borne SAR system are influenced by factors such as temperature change and the like, certain uncertainty exists, and the uncertainty can influence the SAR image radiometric calibration precision and the image distance to the pulse compression effect.
The internal calibration is introduced into the satellite-borne SAR system for solving the problems, and the implementation method is that equipment specially used for calibration is configured in the system, the communication is established between the receiving and transmitting channels of the system, the characteristics of the whole active receiving and transmitting channel except the antenna array are calibrated, and corresponding compensation is carried out according to the calibration result during ground imaging processing.
For a conventional phased array space-borne SAR system, an internal calibration design scheme is mature, as shown in fig. 8. The conventional phased array spaceborne SAR system comprises: a central device 81 and an active phased array antenna 82. Among them, the central device 81 includes: a frequency modulation signal source 811, a data former 812, a radar receiver 813; the active phased array antenna 82 includes: an antenna feed network 821, and a transmit-receive channel 822. An inner scaler 814 is added to the central device 81 and an antenna scaling network 823 is added to the active phased array antenna 82 to form three inner scaling loops: a transmit scaling loop, a receive scaling loop, and a reference scaling loop.
Wherein, the reference calibration loop is: frequency modulation signal source → inner calibrator → radar receiver → data former.
The receiving calibration loop is as follows: frequency modulation signal source → inner calibrator → antenna calibration network → antenna receiving channel → radar receiver → data former.
The emission calibration loop is as follows: frequency modulation signal source → antenna transmitting channel → antenna calibration network → inner calibrator → radar receiver → data former.
In recent years, the DBF technology is applied to a conventional phased array spaceborne SAR system, the DBF technology is applied to a receiving beam in the SAR distance direction, the antenna receiving gain can be greatly improved, and the DBF technology plays an obvious role in improving the sensitivity and the distance ambiguity performance of a radar system.
However, after the DBF technology is adopted, the composition of the receiving and transmitting channels of the DBF spaceborne SAR system and the conventional phased array spaceborne SAR system have changed greatly, as shown in fig. 9. The DBF spaceborne SAR system comprises: a central electronic device 91, an active phased array antenna 92, and a DBF reception processing unit 93. Wherein the central electronic device 91 comprises: a frequency modulation signal source 911 and a data fusion device 912; the active phased array antenna 92 comprises an antenna feed network 921, a transceiving channel 922; the DBF reception processing unit 93 includes: a DBF unit 931, a receiving module 1, a receiving module 2, …, and a receiving module N, wherein the receiving modules 1 to N constitute the receiving module 932. The receiving modules 1 to N are used for receiving chirp signals transmitted by different transceiving channels.
The conventional phased array spaceborne SAR system is centralized signal receiving and signal acquisition; the signal receiving is realized in a radar receiver, and the signal acquisition is realized in a data former; and the DBF satellite-borne SAR system is changed into a plurality of DBF receiving and collecting channels and is dispersed at different positions of the antenna.
Due to the difference between the composition of the receiving and transmitting channels of the DBF spaceborne SAR system after the DBF technology and the conventional phased array spaceborne SAR system, the original conventional internal calibration design scheme is not directly applicable any more, and an internal calibration design scheme suitable for the DBF spaceborne SAR system is necessary to be provided.
In the DBF satellite-borne SAR system, a calibration loop similar to that of a conventional phased array satellite-borne SAR system can be realized by adding a plurality of electronic switches and high-frequency cables between each DBF receiving module and a transmitting-receiving channel, but the internal calibration design scheme becomes more complicated.
The embodiment of the application provides a novel internal calibration design scheme of a DBF satellite-borne SAR system, so as to adapt to the change of the composition of a system transceiving channel after a distance direction receiving beam DBF technology is adopted.
In order to achieve the above object, the present application provides a new internal calibration design scheme for a DBF space-borne SAR system, and by adding a separate calibration signal receiving and collecting channel, the required transmission calibration and reference calibration are achieved, thereby avoiding the introduction of multiple electronic switches and multiple high-frequency cables, and simultaneously satisfying various requirements for calibration in the system, as shown in fig. 10.
As can be seen from fig. 10, compared to the internal calibration design scheme shown in fig. 9, the scheme provided in the embodiment of the present application mainly performs two adjustments: 1) a scaling receiving module 1002 is added to the inner scaler 913 to implement frequency conversion receiving of the scaling signal; 2) a calibration acquisition module 1001 is added to the data fusion device 912 to implement digital conversion of the calibration signal.
Here, the scaling receiving module 1002 is configured to perform frequency conversion receiving on the scaling signal; and the calibration acquisition module 1004 is configured to convert the frequency-converted calibration signal into a digital calibration signal.
The internal calibration scheme provided by the embodiment of the application comprises the following calibration paths:
1) reference calibration loop: frequency modulation signal source → inner calibrator (calibration receiving) → data fusion (calibration acquisition);
2) emission calibration loop: frequency modulation signal source → antenna emission channel → antenna scaling network → inner scaler (scaling reception) → data fusion (scaling collection);
3) receiving a calibration loop: frequency modulation signal source → inner scaler → antenna scaling network → antenna receiving channel → DBF receiving channel.
The calibration scheme provided by the embodiment of the application has the following main characteristics:
1) compared with the internal calibration design scheme of the conventional phased array spaceborne SAR system, the signal receiving module and the signal acquisition module are only added in the original single machine, and the amount of independently added equipment is small;
2) by introducing an independent calibration signal receiving and collecting channel, leakage of the receiving channel is avoided during emission calibration, and an optical fiber delay or a high-isolation switch in an internal calibration scheme of a conventional phased array spaceborne SAR system is not required to be considered, so that the internal calibration design scheme is simplified to a certain extent;
3) by including the additional scaled signal receive and acquisition channels in the reference scaling loop, its effect on the transmit and receive channel gain scaling can be eliminated.
The calibration scheme provided by the embodiment of the application can achieve the following beneficial effects:
a. aiming at the design requirement of a DBF satellite-borne SAR system adopting a DBF technology on internal calibration, a new internal calibration design scheme is provided, and the problem that the conventional internal calibration scheme is not applicable any more due to the composition difference of a transmitting channel and a receiving channel is solved;
b. the proposed internal calibration design scheme for the DBF satellite-borne SAR system adopting the DBF technology only adds a signal receiving module and a signal acquisition module, and realizes the required internal calibration function of the system under the condition of adding very small equipment quantity;
c. the proposed internal calibration design scheme for the DBF spaceborne SAR system adopting the DBF technology avoids leakage of a receiving channel during emission calibration by introducing a separate calibration signal receiving channel and a calibration signal collecting channel, does not need to consider an optical fiber delay or a high-isolation switch in a conventional internal calibration scheme, and simplifies the internal calibration design scheme.
It should be noted that, in the embodiment of the present application, if the internal calibration method is implemented in the form of a software functional module and is sold or used as a stand-alone product, the internal calibration method may also be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or portions thereof contributing to the related art may be embodied in the form of a software product stored in a storage medium, and including several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
Accordingly, embodiments of the present application provide a storage medium, that is, a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps in the internal calibration method provided in the above embodiments.
Here, it should be noted that: the above description of the storage medium, similar to the description of the above method embodiment, has similar advantageous effects as the method embodiment. For technical details not disclosed in the storage medium of the present application, reference is made to the description of the embodiments of the method of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiment of the apparatus is only illustrative, for example, the splitting of the unit is only a logical function splitting, and there may be other splitting manners in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated units described above in the present application may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or portions thereof contributing to the related art may be embodied in the form of a software product stored in a storage medium, and including several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A digital beamforming DBF on-board Synthetic Aperture Radar (SAR) system internal calibration apparatus, the apparatus comprising: the internal calibration module and the data fusion module;
the inner calibration module receives a calibration signal, performs frequency conversion on the calibration signal, and outputs the calibration signal after the frequency conversion;
and the data fusion module receives the frequency-converted calibration signal, converts the frequency-converted calibration signal into a digital calibration signal and performs calibration according to the digital calibration signal.
2. The apparatus of claim 1, further comprising:
the frequency modulation signal generation module is used for generating a linear frequency modulation signal.
3. The apparatus of claim 2, wherein the scaling signal comprises: a first scaling signal of a reference scaling mode;
in the reference scaling mode, the fm signal generation module transmits the chirp signal as the first scaling signal to the inner scaling module.
4. The apparatus of claim 2, wherein the scaling signal comprises: transmitting a second scaled signal of the scaled mode; the device further comprises: an antenna array module;
in a transmitting calibration mode, the chirp generation module transmits the chirp as a transmitting signal to the antenna array module; and the antenna array module receives the transmitting signal, couples and outputs the transmitting signal to obtain a second calibration signal, and transmits the second calibration signal to the inner calibration module.
5. The apparatus of claim 4, wherein the antenna array module comprises: the antenna calibration system comprises an antenna transceiving unit and an antenna calibration network unit; the antenna transceiving unit comprises a plurality of transceiving components;
the antenna transceiver unit is used for receiving the transmitting signal, and coupling and outputting the transmitting signal to the antenna scaling network unit through each transceiver component after power distribution;
and the antenna calibration network unit is used for performing power synthesis on the transmitting signals coupled and output by different transceiving components to obtain a second calibration signal, and sending the second calibration signal to the internal calibration module.
6. The apparatus of claim 2, further comprising: a DBF receiving and processing module;
the inner calibration module receives the linear frequency modulation signal in a receiving calibration mode, and sends the linear frequency modulation signal to the antenna array module as a third calibration signal;
the antenna array module amplifies the third scaling signal and transmits the amplified third scaling signal to the DBF receiving and processing module;
and the DBF receiving and processing module is used for carrying out frequency conversion and amplification on the amplified third calibration signal, converting the amplified third calibration signal into a digital calibration signal and carrying out calibration according to the digital calibration signal.
7. The apparatus of claim 6, wherein the antenna array module comprises: the antenna calibration system comprises an antenna transceiving unit and an antenna calibration network unit;
the antenna scaling network unit distributes the power of the third scaling signal and transmits the third scaling signal to the antenna transceiver unit;
and the antenna transceiving unit amplifies and power-synthesizes the third calibration signal after power distribution and transmits the third calibration signal to the DBF receiving and processing module.
8. A method for internal calibration of a digital beamforming DBF space-borne Synthetic Aperture Radar (SAR) system, the method comprising:
receiving a calibration signal through an inner calibration module, and carrying out frequency conversion on the calibration signal;
and converting the frequency-converted calibration signal into a digital calibration signal through a data fusion module, and calibrating according to the digital calibration signal.
9. The method of claim 8, further comprising:
and generating a linear frequency modulation signal through a frequency modulation signal generation module, wherein the linear frequency modulation signal is used for obtaining the calibration signal.
10. The method of claim 9, further comprising:
under a reference calibration mode, transmitting the linear frequency modulation signal as a first calibration signal to the inner calibration module through the frequency modulation signal generation module;
or in a transmitting calibration mode, the chirp signal is transmitted to the antenna array module as a transmitting signal through the chirp signal generation module, a second calibration signal is obtained through the coupling output of the antenna array module, and the second calibration signal is transmitted to the inner calibration module.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659352A (en) * | 2021-07-28 | 2021-11-16 | 中国电子科技集团公司第十四研究所 | Satellite-borne full-polarization broadband phased array antenna |
| CN113917470A (en) * | 2021-12-14 | 2022-01-11 | 成都锐芯盛通电子科技有限公司 | High-efficiency DBF radar and calibration method |
| CN114185016A (en) * | 2022-02-16 | 2022-03-15 | 中国科学院空天信息创新研究院 | Method for measuring and compensating amplitude-phase error between channels of multi-channel satellite-borne SAR (synthetic aperture radar) antenna |
| CN115629363A (en) * | 2022-12-16 | 2023-01-20 | 西安空间无线电技术研究所 | Real-time internal calibration method and device for satellite-borne detection radar |
| CN116299246A (en) * | 2023-05-19 | 2023-06-23 | 中国科学院空天信息创新研究院 | Method for evaluating internal calibration precision of synthetic aperture radar system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107219526A (en) * | 2017-05-23 | 2017-09-29 | 王辉 | The default mark systems of double star Ka FMCW SAR, method and imaging system |
| CN107271994A (en) * | 2017-05-16 | 2017-10-20 | 上海卫星工程研究所 | Satellite-borne synthetic aperture radar reference function acquisition methods based on internal calibration data |
| CN108562880A (en) * | 2018-04-26 | 2018-09-21 | 西安空间无线电技术研究所 | A kind of reflecting surface Spaceborne SAR System internal calibration network element and internal calibration method |
| CN109633578A (en) * | 2018-12-03 | 2019-04-16 | 上海无线电设备研究所 | A kind of binary channels high-precision phase position Calibration System and method |
-
2020
- 2020-12-11 CN CN202011457918.0A patent/CN112698282B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271994A (en) * | 2017-05-16 | 2017-10-20 | 上海卫星工程研究所 | Satellite-borne synthetic aperture radar reference function acquisition methods based on internal calibration data |
| CN107219526A (en) * | 2017-05-23 | 2017-09-29 | 王辉 | The default mark systems of double star Ka FMCW SAR, method and imaging system |
| CN108562880A (en) * | 2018-04-26 | 2018-09-21 | 西安空间无线电技术研究所 | A kind of reflecting surface Spaceborne SAR System internal calibration network element and internal calibration method |
| CN109633578A (en) * | 2018-12-03 | 2019-04-16 | 上海无线电设备研究所 | A kind of binary channels high-precision phase position Calibration System and method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659352A (en) * | 2021-07-28 | 2021-11-16 | 中国电子科技集团公司第十四研究所 | Satellite-borne full-polarization broadband phased array antenna |
| CN113917470A (en) * | 2021-12-14 | 2022-01-11 | 成都锐芯盛通电子科技有限公司 | High-efficiency DBF radar and calibration method |
| CN113917470B (en) * | 2021-12-14 | 2022-06-17 | 成都锐芯盛通电子科技有限公司 | High-efficiency DBF radar and calibration method |
| CN114185016A (en) * | 2022-02-16 | 2022-03-15 | 中国科学院空天信息创新研究院 | Method for measuring and compensating amplitude-phase error between channels of multi-channel satellite-borne SAR (synthetic aperture radar) antenna |
| CN114185016B (en) * | 2022-02-16 | 2022-05-17 | 中国科学院空天信息创新研究院 | Method for measuring and compensating amplitude-phase error between channels of multi-channel satellite-borne SAR (synthetic aperture radar) antenna |
| CN115629363A (en) * | 2022-12-16 | 2023-01-20 | 西安空间无线电技术研究所 | Real-time internal calibration method and device for satellite-borne detection radar |
| CN116299246A (en) * | 2023-05-19 | 2023-06-23 | 中国科学院空天信息创新研究院 | Method for evaluating internal calibration precision of synthetic aperture radar system |
| CN116299246B (en) * | 2023-05-19 | 2023-07-21 | 中国科学院空天信息创新研究院 | Method for evaluating internal calibration precision of synthetic aperture radar system |
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