CN111294116B - Linear frequency modulation signal processing method, device and equipment - Google Patents
Linear frequency modulation signal processing method, device and equipment Download PDFInfo
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Abstract
A linear frequency modulation signal processing method, a device and equipment comprise the following steps: carrying out pulse modulation on a narrow-band linear frequency modulation signal to be transmitted; the frequency of the modulation pulse is not less than the bandwidth of the narrow-band linear frequency modulation signal; closing a receiving channel when the modulated narrow-band linear frequency modulation signal sub-pulse is transmitted; carrying out radio frequency signal storage DRFM on a broadband linear frequency modulation signal to be transmitted and playing in sections; the sum of the pulse width and the bandwidth of each sub pulse of the broadband linear frequency modulation signal is the same as that of the original signal; and closing the receiving channel when the broadband linear frequency modulation signal sub-pulse played in the segmented mode is transmitted. By adopting the scheme in the application, the realization is easy and the isolation effect is good.
Description
Technical Field
The present application relates to radio frequency simulation technologies, and in particular, to a method, an apparatus, and a device for processing a linear frequency modulation signal.
Background
In a microwave darkroom radiation type radio frequency simulation system, the distance between a transmitting antenna and a receiving antenna cannot be large, a transmitting signal enters the receiving antenna through an antenna side lobe, and the isolation is poor.
The traditional methods for solving the isolation include methods of adding wave-absorbing materials, radio frequency cancellation and the like, the wave-absorbing materials have poor isolation effect, the wave-absorbing materials used in different wave bands are different, the radio frequency cancellation method has limited improvement on isolation, has extremely high requirement on signal phase control precision, and is difficult to realize.
Disclosure of Invention
The embodiment of the application provides a linear frequency modulation signal processing method, a device and equipment, which are used for solving the technical problem.
According to a first aspect of embodiments of the present application, there is provided a chirp signal processing method, including the steps of:
carrying out pulse modulation on a narrow-band linear frequency modulation signal to be transmitted; the frequency of the modulation pulse is not less than the bandwidth of the narrow-band linear frequency modulation signal;
and closing the receiving channel when the modulated narrow-band chirp signal sub-pulse is transmitted.
According to a second aspect of the embodiments of the present application, there is provided a chirp signal processing method, including:
carrying out radio frequency signal storage DRFM on a broadband linear frequency modulation signal to be transmitted and playing in sections; the sum of the pulse width and the bandwidth of each sub pulse of the broadband linear frequency modulation signal is the same as that of the original signal;
and closing the receiving channel when the broadband linear frequency modulation signal sub-pulse played in the segmented mode is transmitted.
According to a third aspect of the embodiments of the present application, there is provided a chirp signal processing apparatus including:
the modulation module is used for carrying out pulse modulation on the narrow-band linear frequency modulation signal to be transmitted; the frequency of the modulation pulse is not less than the bandwidth of the narrow-band linear frequency modulation signal;
and the first processing module is used for closing the receiving channel when the modulated narrow-band chirp signal sub-pulse is transmitted.
According to a fourth aspect of the embodiments of the present application, there is provided a chirp signal processing apparatus including:
the storage module is used for storing the radio frequency signal DRFM for the broadband linear frequency modulation signal to be transmitted and playing the signal in sections; the sum of the pulse width and the bandwidth of each sub pulse of the broadband linear frequency modulation signal is the same as that of the original signal;
and the second processing module is used for closing the receiving channel when the broadband linear frequency modulation signal sub-pulse played in a segmented mode is transmitted.
According to a fifth aspect of the embodiments of the present application, there is provided a chirp signal transceiving apparatus including the chirp signal processing device, the transmission channel, the reception channel, the transmission antenna, and the reception antenna as described above.
By adopting the linear frequency modulation signal processing method, the device and the equipment provided by the embodiment of the application, the narrow-band linear frequency modulation signal is modulated and transmitted by adopting extremely narrow pulse at high speed, the modulation pulse frequency is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted; the DRFM (radio frequency signal storage) is adopted for carrying out segmented playing on the broadband linear frequency modulation signal, and the receiving channel is closed when the sub-pulse is transmitted, so that the realization is easy and the isolation effect is good.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flow chart illustrating an implementation of a chirp signal processing method according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating transmission and reception of a narrowband chirp signal in an embodiment of the present application;
fig. 3 shows a modulation diagram of a narrowband chirp signal in an embodiment of the present application;
fig. 4 is a schematic flow chart illustrating an implementation of a chirp signal processing method according to a second embodiment of the present application;
fig. 5 is a schematic diagram illustrating the transceiving of a wideband chirp signal in the second embodiment of the present application;
fig. 6 shows a modulation diagram of a wideband chirp signal in an embodiment two of the present application;
fig. 7 is a schematic structural diagram of a chirp signal processing apparatus according to a third embodiment of the present application;
fig. 8 is a schematic structural diagram of a chirp signal processing apparatus according to a fourth embodiment of the present application;
fig. 9 is a schematic structural diagram of a fifth chirp signal transceiving device according to an embodiment of the present application.
Detailed Description
The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Aiming at the technical problems in the prior art, the embodiment of the application provides a linear frequency modulation pulse signal generation and processing method compatible with wide and narrow band signals, which is suitable for a microwave darkroom radio frequency radiation type simulation test, and has the advantages of easy realization and good isolation effect.
The wideband and narrowband chirp signals are used differently in radar, and the processing methods for improving isolation are different, and are described below.
Example one
The embodiment of the application provides a processing method for improving isolation aiming at narrow-band linear frequency modulation signals.
The inventor notices in the process of invention that:
the narrow-band linear frequency modulation signal is used for searching and tracking a target by a radar, and the resolution is improved without reducing the searching and tracking distance by adopting the linear frequency modulation signal in order to improve the time-bandwidth product of the signal. In a microwave darkroom radiation test, the distance is limited, and the equivalent tracking and searching effect on the target can be realized by adopting a modulation isolation method.
Fig. 1 is a schematic flowchart illustrating an implementation of a chirp signal processing method according to an embodiment of the present application.
As shown in the figure, the chirp signal processing method includes:
step 101, performing pulse modulation on a narrow-band linear frequency modulation signal to be transmitted; the frequency of the modulation pulse is not less than the bandwidth of the narrow-band linear frequency modulation signal;
and step 102, closing a receiving channel when the modulated narrow-band chirp signal sub-pulse is transmitted.
Fig. 2 shows a schematic diagram of transceiving of a narrowband chirp signal in an embodiment of the present application.
As shown in the figure, in the prior art, as shown in the left side of the figure, a transmitting channel transmits a narrowband chirp signal through a transmitting antenna, a receiving channel receives a narrowband chirp signal through a receiving antenna, and a direct signal can be transmitted between the transmitting antenna and the receiving antenna. In the embodiment of the application, as shown in the right figure, a modulation process is added.
Fig. 3 shows a modulation diagram of a narrowband chirp signal in an embodiment of the present application.
As shown in the figure, in the embodiment of the present application, an original transmission signal is modulated into a modulated transmission signal through a certain modulation frequency, and a received narrowband chirp signal is also a modulated received signal. Both the modulated transmitted signal and the received signal (including the overall bandwidth of the sub-pulses and the gaps) have the same bandwidth as the original transmitted signal.
The modulation frequency is not less than the signal bandwidth, so that the modulated signal is not aliased in the frequency domain, and the high-speed modulation is difficult to realize for the signal with the larger bandwidth.
By adopting the linear frequency modulation signal processing method provided by the embodiment of the application, the narrow-band linear frequency modulation signal is subjected to extremely narrow pulse high-speed modulation transmission signal, the modulation pulse frequency is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted, so that the realization is easy and the isolation effect is good.
In one embodiment, the method further comprises:
an echo signal is received in a gap between the transmission of the plurality of narrowband chirp signal sub-pulses.
In specific implementation, the design of the sub-pulse width and the sub-pulse gap is required to cover the target, and the echo signal and the direct signal are not overlapped.
In the embodiment of the application, the modulation isolation is used for modulating the transmitted signal at a high speed by using an extremely narrow pulse, the modulation pulse frequency is not less than the signal bandwidth, the receiving channel is closed when the sub-pulses are transmitted, and the echo signal is received in the gap between the sub-pulses.
In one embodiment, the method further comprises:
and filtering the received signal, and recovering to obtain the original signal before modulation.
In specific implementation, the received signal is filtered by a filter, and can be restored to the signal which should be received originally, and pulse compression is carried out according to normal signal processing.
Example two
The embodiment of the application provides a processing method for improving isolation aiming at a broadband linear frequency modulation signal.
The inventor notices in the process of invention that:
the broadband linear frequency modulation signal is used for imaging a target by a radar, the large bandwidth ensures the distance resolution of imaging, azimuth-resolved imaging is realized through azimuth accumulation, the requirement on the accumulation time is not high, and only enough accumulation angle is needed, so that the pulse splicing mode is adopted to realize transceiving isolation, and the length of a modulated pulse train is allowed to be longer than that of the original pulse.
Fig. 4 is a schematic flow chart illustrating an implementation of a chirp signal processing method in the second embodiment of the present application.
As shown in the figure, the chirp signal processing method includes:
step 401, storing a radio frequency signal DRFM for a broadband linear frequency modulation signal to be transmitted and playing the signal in a segmented manner; the sum of the pulse width and the bandwidth of each sub pulse of the broadband linear frequency modulation signal is the same as that of the original signal;
and step 402, closing the receiving channel when the broadband linear frequency modulation signal sub-pulse played in a segmented mode is transmitted.
In specific implementation, in the embodiment of the present application, the transmitted wideband chirp signal is segmented and played by using a DRFM (radio frequency signal storage), and a sum of pulse widths and a sum of bandwidths of sub-pulses is equal to a sum of pulse widths and a bandwidth of an original transmitted signal. And closing the receiving channel when the sub-pulse is transmitted so as to improve the isolation.
Fig. 5 shows a schematic diagram of transceiving of a wideband chirp signal in the second embodiment of the present application.
As shown in the drawing, in the prior art, as shown in the left side of the drawing, the transmitting channel transmits a broadband chirp signal through the transmitting antenna, the receiving channel receives the broadband chirp signal through the receiving antenna, and a direct signal can be transmitted between the transmitting antenna and the receiving antenna. In the embodiment of the application, as shown in the right figure, a DRFM component is added to each of the transmitting channel and the receiving channel.
Fig. 6 shows a modulation diagram of a wideband chirp signal in the second embodiment of the present application.
As shown in the figure, in the embodiment of the present application, an original transmission signal is modulated into a modulated transmission signal through a certain modulation frequency, and a received signal is also a modulated received signal. The sum of the pulse width and the bandwidth of each sub-pulse of the modulated signal (excluding the gap) is equal to the pulse width and the bandwidth of the original transmitting signal.
By adopting the linear frequency modulation signal processing method provided by the embodiment of the application, the DRFM (radio frequency signal storage) is adopted for carrying out segmented playing on the broadband linear frequency modulation signal, and the receiving channel is closed when the sub-pulse is transmitted, so that the realization is easy, and the isolation effect is good.
In one embodiment, the method further comprises:
and storing the DRFM by the radio frequency signal of the received broadband linear frequency modulation signal and playing the DRFM in a delayed mode.
In specific implementation, the embodiment of the present application also adopts DRFM to store and delay the received signal.
In one embodiment, the method further comprises:
after all the sub-pulses are received, pulse gaps are removed, the sub-pulses are spliced into complete pulses, and the width and the bandwidth of the spliced pulses are the same as those of original signals.
In specific implementation, pulse gaps are eliminated after all sub-pulses are received, the sub-pulses are spliced into a complete pulse, the pulse width and the signal bandwidth are the same as those of an original signal, and therefore the equivalence of a signal transmitted and received after modulation and a signal before modulation is achieved.
In one embodiment, the DRFM uses a first-in-first-out FIFO structure when receiving signals, only the part with signals is received, and the sub-pulse gap does not receive signals; and after the number of the received signals exceeds half of the number of the sub-pulses, the signals are played while being received.
In the embodiment of the application, the receiving channel is closed to improve the isolation degree when the sub-pulse is transmitted, the DRFM component adopts an FIFO structure during receiving, only the part with the signal is received, the sub-pulse gap does not receive the signal, the signal is received and played after the number of the received signal exceeds half of the number of the sub-pulse, the signal synthesized by the sub-pulse and the signal which should be received originally have little delay, and the bandwidth pulse width is consistent.
The design of the sub-pulse width and the sub-pulse gap is required to cover the target, and the echo signal and the direct signal are not overlapped. And processing the spliced signals by adopting an original broadband pulse compression algorithm.
EXAMPLE III
Based on the same inventive concept, the embodiments of the present application provide a linear frequency modulation signal processing apparatus, and the principle of the apparatus for solving the technical problem is similar to that of the linear frequency modulation signal processing method in the first embodiment, and repeated parts are not described again.
Fig. 7 is a schematic structural diagram of a chirp signal processing apparatus according to a third embodiment of the present application.
As shown in the figure, the chirp signal processing apparatus includes:
the modulation module 701 is configured to perform pulse modulation on a to-be-transmitted narrowband chirp signal; the frequency of the modulation pulse is not less than the bandwidth of the narrow-band linear frequency modulation signal;
a first processing module 702, configured to close the receiving channel when the modulated narrowband chirp signal sub-pulse is transmitted.
By adopting the linear frequency modulation signal processing device provided by the embodiment of the application, the narrow-band linear frequency modulation signal is subjected to extremely narrow pulse high-speed modulation transmission signal, the modulation pulse frequency is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted, so that the realization is easy and the isolation effect is good.
In one embodiment, further comprising:
a receiving module for receiving the echo signal at a gap between the transmitted plurality of narrowband chirp signal sub-pulses.
In one embodiment, further comprising:
and the filtering module is used for filtering the received signal and recovering to obtain the original signal before modulation.
Example four
Based on the same inventive concept, the embodiment of the present application provides a linear frequency modulation signal processing apparatus, and the principle of the apparatus for solving the technical problem is similar to that of the linear frequency modulation signal processing method in the second embodiment, and repeated parts are not described again.
Fig. 8 is a schematic structural diagram of a chirp signal processing apparatus according to a fourth embodiment of the present application.
As shown in the figure, the chirp signal processing apparatus includes:
the storage module 801 is configured to perform radio frequency signal storage DRFM on a to-be-transmitted wideband linear frequency modulation signal and perform segmented playing; the sum of the pulse width and the bandwidth of each sub pulse of the broadband linear frequency modulation signal is the same as that of the original signal;
and a second processing module 802, configured to close the receiving channel when the wideband chirp signal sub-pulse played in segments is transmitted.
By adopting the linear frequency modulation signal processing device provided by the embodiment of the application, the DRFM (radio frequency signal storage) is adopted for carrying out segmented playing on the broadband linear frequency modulation signal, and the receiving channel is closed when the sub-pulse is transmitted, so that the realization is easy, and the isolation effect is good.
In one embodiment, further comprising:
and the first receiving and processing module is used for storing the radio frequency signal DRFM and playing the received broadband linear frequency modulation signal in a delayed manner.
In one embodiment, further comprising:
and the second receiving and processing module is used for eliminating the pulse gaps after receiving all the sub-pulses, splicing the sub-pulses into a complete pulse, and ensuring that the width and the bandwidth of the spliced pulse are the same as those of the original signal.
In one embodiment, further comprising:
when receiving signals, the DRFM adopts a first-in first-out FIFO structure, only receives the part with signals, and the sub-pulse interval does not receive the signals; and after the number of the received signals exceeds half of the number of the sub-pulses, the signals are played while being received.
EXAMPLE five
Based on the same inventive concept, the embodiment of the present application further provides a chirp signal transceiver device, which is described below.
Fig. 9 is a schematic structural diagram of a fifth chirp signal transceiving device according to an embodiment of the present application.
As shown, the chirp transceiving apparatus comprises: a chirp signal processing apparatus as described in embodiment three and/or a chirp signal processing apparatus as described in embodiment four, and a transmit channel, a receive channel, a transmit antenna and a receive antenna.
By adopting the linear frequency modulation signal transceiver provided by the embodiment of the application, the narrow-band linear frequency modulation signal is modulated and transmitted by adopting extremely narrow pulse at high speed, the modulation pulse frequency is not less than the signal bandwidth, and the receiving channel is closed when the sub-pulse is transmitted; the DRFM (radio frequency signal storage) is adopted for carrying out segmented playing on the broadband linear frequency modulation signal, and the receiving channel is closed when the sub-pulse is transmitted, so that the realization is easy and the isolation effect is good.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (5)
1. A method of processing a chirp signal, comprising:
carrying out radio frequency signal storage DRFM on a broadband linear frequency modulation signal to be transmitted and playing in sections; the sum of the pulse width and the bandwidth of each sub pulse of the broadband linear frequency modulation signal is the same as the pulse width and the bandwidth of the broadband linear frequency modulation signal to be transmitted;
closing a receiving channel when the broadband linear frequency modulation signal sub-pulse played in a segmented mode is transmitted;
when receiving signals, the DRFM adopts a first-in first-out FIFO structure, only receives the part with signals, and the sub-pulse interval does not receive the signals; after the number of the received signals exceeds half of the number of the sub-pulses, the received signals are played simultaneously; the design of the sub-pulse width and the sub-pulse gap meets the coverage target, an echo signal and a direct signal are not overlapped, and the received signal comprises the echo signal and the direct signal.
2. The method of claim 1, further comprising:
and storing the DRFM by the radio frequency signal of the received broadband linear frequency modulation signal and playing the DRFM in a delayed mode.
3. The method of claim 1, further comprising:
and after receiving all the sub-pulses, eliminating the pulse gaps, splicing the sub-pulses into a complete pulse, wherein the width and the bandwidth of the spliced pulse are the same as those of the broadband linear frequency modulation signal to be transmitted.
4. A chirp signal processing apparatus, comprising:
the storage module is used for storing the radio frequency signal DRFM for the broadband linear frequency modulation signal to be transmitted and playing the signal in sections; the sum of the pulse width and the bandwidth of each sub pulse of the broadband linear frequency modulation signal is the same as the pulse width and the bandwidth of the broadband linear frequency modulation signal to be transmitted;
the second processing module is used for closing the receiving channel when the broadband linear frequency modulation signal sub-pulse played in a segmented mode is transmitted;
the second receiving and processing module is used for receiving the signal, the DRFM adopts a first-in first-out FIFO structure, only receives the part with the signal, and does not receive the signal in the sub-pulse gap; after the number of the received signals exceeds half of the number of the sub-pulses, the received signals are played simultaneously; the design of the sub-pulse width and the sub-pulse gap meets the coverage target, an echo signal and a direct signal are not overlapped, and the received signal comprises the echo signal and the direct signal.
5. A chirp transceiving apparatus comprising the chirp processing apparatus of claim 4, and a transmit channel, a receive channel, a transmit antenna and a receive antenna.
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| CN103760528B (en) * | 2014-01-22 | 2016-06-29 | 中国科学院电子学研究所 | A kind of continuous impulse radar base band signal producing means |
| CN106353739B (en) * | 2016-09-30 | 2018-12-25 | 中国人民解放军装备学院 | A kind of radar chaff method based on leggy segmentation modulation |
| CN107271980B (en) * | 2017-07-17 | 2019-07-12 | 中国人民解放军国防科学技术大学 | A kind of segmented matched filter processing method of pair of interval modulated signal |
| CN109490884B (en) * | 2018-11-21 | 2020-08-07 | 中国科学院电子学研究所 | Multi-pulse combined imaging method for realizing anti-interference of SAR (synthetic aperture radar) |
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| CN101071404A (en) * | 2006-05-09 | 2007-11-14 | 大唐移动通信设备有限公司 | Small-capacity FIFO storage device data-moving trigger and method |
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