CN114325618A - Target clutter simulation device and method and radar testing device - Google Patents
Target clutter simulation device and method and radar testing device Download PDFInfo
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Abstract
The invention discloses a target clutter simulation device and method and a radar testing device, and relates to the field of radar training and testing. The device includes: the frequency conversion device comprises a switch filtering module, a frequency conversion module, a medium-frequency digital frequency storage module and a control module, wherein the switch filtering module, the frequency conversion module and the medium-frequency digital frequency storage module are sequentially connected, and the control module is respectively connected with the switch filtering module, the frequency conversion module and the medium-frequency digital frequency storage module; the target clutter simulation device realizes target interference simulation of a wide frequency band, can realize radar test measurement, and is more helpful for simulation training of radar.
Description
Technical Field
The invention relates to the field of radar training and testing, in particular to a target clutter simulation device and method and a radar testing device.
Background
Radars in different frequency bands have training requirements, so that research and development of target simulation equipment are needed. At present, most target simulation equipment is designed for a certain type of radar, so that the target simulation equipment is designed only for a certain specific frequency band and can only be applied to an up-down frequency conversion module with the specific frequency band. The training requirements of radars with different frequency bands cannot be met.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a target clutter simulation device, a target clutter simulation method and a radar testing device.
The technical scheme for solving the technical problems is as follows:
a target clutter simulation apparatus comprising: the device comprises a switch filtering module, a frequency conversion module, an intermediate frequency digital frequency storage module and a control module;
the switch filtering module, the frequency conversion module and the intermediate-frequency digital frequency storage module are sequentially connected;
the control module is respectively connected with the switch filtering module, the frequency conversion module and the intermediate-frequency digital frequency storage module;
the switch filtering module is used for receiving a first radio frequency signal to be processed and performing first filtering processing on the first radio frequency signal according to a first control parameter sent by the control module to obtain a first radio frequency signal;
the frequency conversion module is used for carrying out first frequency conversion processing on the first radio frequency signal according to a second control parameter issued by the control module to obtain an intermediate frequency signal;
the intermediate frequency digital frequency storage module is used for carrying out target signal analog processing on the intermediate frequency signal according to a third control parameter issued by the control module;
the frequency conversion module is further used for carrying out second frequency conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal;
and the switch filtering module is also used for carrying out second filtering processing on the second radio frequency signal according to the first control parameter to obtain a target signal.
The invention has the beneficial effects that: the target clutter simulation device comprises a switch filtering module, a frequency conversion module, an intermediate frequency digital frequency storage module and a control module, and the target interference simulation of a wide frequency range is realized, so that radar test measurement can be realized, and more assistance is provided for simulation training of a radar. The problem of single, the repeated development of traditional method target clutter analog equipment frequency channel is solved, this scheme universalization, standardization level are high, have solved the problem of the repeated development of different frequency channel radar target clutter analog equipment, and have increased radar parameter measurement function, have more abundant function.
Further, the switch filter module includes: the uplink switch filtering module and the downlink switch filtering module;
the downlink switch filtering module is used for receiving a first radio frequency signal to be processed, and carrying out amplitude limiting and band-pass filtering processing of a preset frequency band on the first radio frequency signal according to a first control parameter to obtain a first radio frequency signal;
and the uplink switch filtering module is used for filtering, amplifying and attenuating the second radio frequency signal according to a first control parameter to obtain a target signal.
The beneficial effect of adopting the further scheme is that: according to the scheme, the downlink switch filtering module is used for carrying out amplitude limiting and filtering processing on the received signal, and the target clutter simulation equipment can be controlled to work in a corresponding working frequency band. And filtering, amplifying and attenuating the radio frequency signal through the uplink switch filtering module.
Further, the downstream switch filtering module includes: the device comprises a limiter, a first switch, a first band-pass filter bank and a second switch;
the amplitude limiter, the first switch, the first band-pass filter bank and the second switch are connected in sequence;
the first band-pass filter bank comprises a plurality of band-pass filters in different frequency bands, and the band-pass filter in each frequency band is connected with the first switch and the second switch respectively.
The beneficial effect of adopting the further scheme is that: according to the scheme, the downlink switch filtering module is used for carrying out amplitude limiting and filtering processing on the received signal, and the target clutter simulation equipment can be controlled to work in a corresponding working frequency band.
Further, the upstream switch filtering module includes: the third switch, the second band-pass filter group, the fourth switch, the amplifier and the programmable attenuator;
the third switch, the second band-pass filter bank, the fourth switch, the amplifier and the programmable attenuator are connected in sequence;
the programmable attenuator is respectively connected with the third switch and the fourth switch;
the second band-pass filter group comprises a plurality of band-pass filters in different frequency bands, and the band-pass filter in each frequency band is connected with the third switch and the fourth switch respectively.
The beneficial effect of adopting the further scheme is that: according to the scheme, the radio-frequency signal is filtered, amplified and attenuated through the uplink switch filtering module, and the attenuation range of program-controlled attenuation is determined according to the range of the amplitude fluctuation of the simulated target.
Further, the frequency conversion module includes: the device comprises an up-conversion module and a down-conversion module;
the down-conversion module is used for performing down-conversion processing on the first radio frequency signal according to a second control parameter to obtain an intermediate frequency signal;
and the up-conversion module is used for carrying out up-conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal.
The beneficial effect of adopting the further scheme is that: according to the scheme, the intermediate frequency signal is subjected to frequency conversion processing through the frequency conversion module, and the target clutter simulation equipment is controlled to work in a corresponding working frequency band.
Further, the control module includes: control software and a display control module; the control software is used for receiving a target simulation parameter, calculating a first control parameter, a second control parameter and a third control parameter according to the target simulation parameter, and outputting the first control parameter, the second control parameter and the third control parameter to the display control module;
the display control module is used for displaying the first control parameter, the second control parameter and the third control parameter.
The beneficial effect of adopting the further scheme is that: according to the scheme, the functions of calculating target simulation parameters and measuring the parameters are realized through a control module; and the display of the loopback parameters and the monitoring data is realized through the display control module.
Another technical solution of the present invention for solving the above technical problems is as follows:
a target clutter simulation method comprises the following steps:
receiving a first radio frequency signal to be processed, and performing first filtering processing on the first radio frequency signal according to a first control parameter issued by a control module to obtain a first radio frequency signal;
performing first frequency conversion processing on the first radio frequency signal according to a second control parameter issued by the control module to obtain an intermediate frequency signal;
performing target signal simulation processing on the intermediate frequency signal according to a third control parameter issued by the control module;
performing second frequency conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal;
and carrying out second filtering processing on the second radio frequency signal according to the first control parameter to obtain a target signal.
The invention has the beneficial effects that: according to the scheme, the target clutter simulation method is executed in the target clutter simulation device, the target interference simulation of a wide frequency band is realized, the radar test measurement can be realized, and the simulation training of the radar is assisted. The problem of single, the repeated development of traditional method target clutter analog equipment frequency channel is solved, this scheme universalization, standardization level are high, have solved the problem of the repeated development of different frequency channel radar target clutter analog equipment, and have increased radar parameter measurement function, have more abundant function.
Further, the receiving a first radio frequency signal to be processed, and performing a first filtering process on the first radio frequency signal according to a first control parameter to obtain a first radio frequency signal specifically includes:
carrying out amplitude limiting and band-pass filtering processing of a preset frequency band on the first radio frequency signal according to a first control parameter to obtain a first radio frequency signal;
the second filtering the second radio frequency signal according to the first control parameter to obtain the target signal specifically includes: and filtering, amplifying and attenuating the second radio frequency signal according to the first control parameter to obtain a target signal.
The beneficial effect of adopting the further scheme is that: according to the scheme, the downlink switch filtering module is used for carrying out amplitude limiting and filtering processing on the received signal, and the target clutter simulation equipment can be controlled to work in a corresponding working frequency band. And filtering, amplifying and attenuating the radio frequency signal through the uplink switch filtering module.
Further, the performing, according to the second control parameter, the first frequency conversion processing on the first radio frequency signal to obtain an intermediate frequency signal specifically includes:
performing down-conversion processing on the first radio frequency signal according to a second control parameter to obtain an intermediate frequency signal;
the obtaining of the second radio frequency signal by performing the second frequency conversion processing on the preset intermediate frequency signal according to the second control parameter specifically includes:
and carrying out up-conversion processing on the preset intermediate frequency signal according to a second control parameter to obtain a second radio frequency signal.
The beneficial effect of adopting the further scheme is that: according to the scheme, the intermediate frequency signal is subjected to frequency conversion processing through the frequency conversion module, and the target clutter simulation equipment is controlled to work in a corresponding working frequency band.
Further, still include: receiving a target simulation parameter, calculating a first control parameter, a second control parameter and a third control parameter according to the target simulation parameter, and outputting the first control parameter, the second control parameter and the third control parameter to the display control module;
and displaying the first control parameter, the second control parameter and the third control parameter.
The beneficial effect of adopting the further scheme is that: according to the scheme, the functions of calculating target simulation parameters and measuring the parameters are realized through a control module; and the display of the loopback parameters and the monitoring data is realized through the display control module.
Another technical solution of the present invention for solving the above technical problems is as follows:
a radar testing apparatus comprising: adopt a target clutter analogue means of any one above-mentioned scheme.
The invention has the beneficial effects that: the target clutter simulation device comprises a switch filtering module, a frequency conversion module, an intermediate frequency digital frequency storage module and a control module, and the target interference simulation of a wide frequency range is realized, so that radar test measurement can be realized, and more assistance is provided for simulation training of a radar. The problem of single, the repeated development of traditional method target clutter analog equipment frequency channel is solved, this scheme universalization, standardization level are high, have solved the problem of the repeated development of different frequency channel radar target clutter analog equipment, and have increased radar parameter measurement function, have more abundant function.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of a target clutter simulation apparatus according to an embodiment of the present invention
Fig. 2 is a schematic flowchart of a target clutter simulation method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a target clutter simulation apparatus according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a control module according to another embodiment of the present invention;
FIG. 5 is a control flow diagram of control software according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a downlink switch filtering module according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of an uplink switch filtering module according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a down-conversion module according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of an up-conversion module according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of an intermediate frequency digital frequency storage module according to another embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
As shown in fig. 1, a target clutter simulation apparatus provided in an embodiment of the present invention includes: the device comprises a switch filtering module 1101, a frequency conversion module 1102, an intermediate frequency digital frequency storage module 1103 and a control module 1104;
in one embodiment, the up-down conversion module of the target clutter simulation device in the wide band needs to perform a frequency division design, and the frequency division may include: 1-6GHz, 6-10GHz, 10-14GHz and 14-18 GHz;
the switch filtering module 1101, the frequency conversion module 1102 and the intermediate frequency digital frequency storage module 1103 are connected in sequence;
the control module 1104 is respectively connected with the switch filtering module 1101, the frequency conversion module 1102 and the middle frequency digital frequency storage module 1103;
the switch filtering module 1101 is configured to receive a first radio frequency signal to be processed, and perform first filtering processing on the first radio frequency signal according to a first control parameter to obtain a first radio frequency signal;
the frequency conversion module 1102 is configured to perform a first frequency conversion process on the first radio frequency signal according to the second control parameter, so as to obtain an intermediate frequency signal;
the intermediate frequency digital frequency storage module 1103 is configured to perform target signal analog processing on the intermediate frequency signal according to a third control parameter;
the frequency conversion module 1102 is further configured to perform a second frequency conversion process on the preset intermediate frequency signal according to a second control parameter to obtain a second radio frequency signal;
the switch filtering module 1101 is further configured to perform a second filtering process on the second radio frequency signal according to the first control parameter to obtain a target signal;
it should be noted that, in a certain embodiment, the up-down conversion link includes a switch filtering module 1101 and a frequency conversion module 1102, the switch filtering module 1101 includes a down-switch filtering and an up-switch filtering, and the frequency conversion module 1102 includes a down-conversion module and an up-conversion module. After receiving the radio frequency signal, the downlink switch filtering in the switch filtering module 1101 performs amplitude limiting, gating and filtering on the signal, and then the signal is sent to the down-conversion module of the frequency conversion module 1102 for down-conversion processing, and the processed intermediate frequency signal is sent to the intermediate frequency digital frequency storage module 1103. The intermediate frequency signal processed by the intermediate frequency digital frequency storage module 1103 is first up-converted by the frequency conversion module 1102 into a radio frequency signal, and then is sent to the up switch filter of the switch filter module 1101 for filtering, amplifying, attenuating and transmitting.
Preferably, in a certain embodiment, the receive down-conversion is firstly performed with receive filtering, and the radar detection signals of 1 to 18GHz are gated according to frequency division and then sent to the frequency conversion module 1102 at the rear end; the frequency conversion module 1102 adopts a two-stage frequency conversion system, converts the received and filtered strobe signal into an intermediate frequency signal with 1.2GHz and a bandwidth of 1GHz by independently changing a local oscillator signal and a fixed two local oscillator signals, and sends the intermediate frequency signal to the intermediate frequency digital frequency storage module 1103 for processing the intermediate frequency signal. It should be noted that the filtering gating is used for gating a frequency band, and the working frequency band of the target clutter simulation device is designed to be wide and can be applied to all radar training within the range of 1-18 GHz.
The control module 1104 is configured to calculate a first control parameter, a second control parameter, and a third control parameter according to the received target simulation parameter, and send the first control parameter to the switch filtering module 1101; sending the second control parameter to the frequency conversion module 1102; the third control parameter is sent to the if digital frequency storage block 1103. The target simulation parameters are input to the control software by the upper computer through a network interface and are determined by a user needing the target clutter simulation equipment. It should be noted that, the working parameters of each module are set as required to complete the simulation function of the target and the clutter signal. The working frequency band required by radar training can be gated by issuing the control parameters, and the applicable frequency band of the device is improved.
It should be noted that, in an embodiment, the structure of the control module 1104 is shown in fig. 4, and the design method of the control module 1104 may include: after the target analog parameters are received through the network interface, the target analog parameters need to be analyzed into control parameters of the switch filter module 1101, the frequency conversion module 1102 and the intermediate frequency digital frequency storage module 1103, namely, first control parameters, second control parameters and third control parameters, which are issued according to a certain time sequence relationship, and parameters and monitoring data returned by the switch filter module 1101, the frequency conversion module 1102 and the intermediate frequency digital frequency storage module 1103 are received and output to the display control module through the network interface for display. The data returned by the target clutter simulation equipment comprises real-time parameters such as target signal frequency, target current distance, current speed, receiving attenuation, transmitting attenuation and monitoring data, and the real-time parameters are returned at a fixed period in the target signal simulation.
In another embodiment, as shown in fig. 5, the control software in the control module 1104 controls the process, and first performs internal hardware initialization, network initialization, self-test, interrupt enable, and timed interrupt enable, when an interrupt occurs, calculates a target parameter, continues to monitor the interrupt if the interrupt does not occur, measures a radar parameter after the target parameter is calculated, outputs the target parameter, and continues to monitor whether the interrupt occurs after the target parameter is output. In another embodiment, the design of each software module is performed according to a program flow chart, and the target parameter can be calculated by a first formula, a second formula and a third formula;
the following is a first formula expressing the relationship between the delay time τ and the radial distance R of the target:
τ＝2R/c，
where τ represents a delay time, R represents a target radial distance, and c represents a propagation speed of an electromagnetic wave in air.
According to a second formula:
Pr＝C(Pt/R4)，
obtaining the distance attenuation characteristic of the target echo: the power of the target echo is inversely proportional to the 4 th power of the target to radar distance R;
wherein C represents a constant determined by radar and target parameters, PrRepresenting the power, P, of a target echo received by the radartRepresenting the power of the wave transmitted by the radar and R representing the distance of the target from the radar.
When the target moves radially relative to the radar, the target echo will produce doppler frequency shift, according to the third formula:
fd＝2vr/λ，
calculating the Doppler frequency, where λ denotes the emission wavelength, vrRepresenting the target radial velocity. The pulse width is measured by the rising and falling edges of the pulseThe time interval of two points at 50% of the amplitude. When the pulse envelope sequence arrives, pulse data are classified through differential operation, and rising edge data, falling edge data and top data (pulse peak values) are taken out and sent to a pulse width measuring module. Pulse width measurements were made by an internal counter with 50% top data as the start and end of pulse width calculation.
In a certain embodiment, the working frequency band of the target clutter simulation equipment can be selected to be 1-18 GHz, and the working instantaneous bandwidth is 1 GHz. The up-down conversion module of the target clutter simulation equipment in the wide frequency band needs to be designed with frequency division, as shown in fig. 3, the frequency division idea is selected as follows: 1 to 6GHz, 6 to 10GHz, 10 to 14GHz and 14 to 18 GHz. The treatment method comprises the following steps: receiving down-conversion is firstly carried out receiving filtering, radar detection signals of 1-18 GHz are gated according to frequency band division, and then the signals are sent to a rear-end frequency conversion module 1102; the frequency conversion module 1102 adopts a two-stage frequency conversion system, converts the received and filtered strobe signal into an intermediate frequency signal with 1.2GHz and a bandwidth of 1GHz by independently changing a local oscillator signal and a fixed two local oscillator signals, and sends the intermediate frequency signal to the intermediate frequency digital frequency storage module 1103 for processing the intermediate frequency signal.
The signal processed by the intermediate frequency digital frequency storage module 1103 is 1.2GHz, the bandwidth is 1GHz, and the signal is converted into a radio frequency signal of 1-6GHz, or 6-10GHz, or 10-14GHz, or 14-18GHz through an up-conversion link of the frequency conversion module 1102, and the radio frequency signal is sent to the transmission switch filtering component for band-pass filtering and gating, and then is transmitted after amplification and attenuation, where it is to be noted that, in a certain embodiment, the attenuation range of program-controlled attenuation can be determined according to the range of analog target amplitude fluctuation.
In another embodiment, designing the if digital frequency storage block 1103 may include: determining the instantaneous working bandwidth of the intermediate-frequency digital frequency storage module 1103 according to the instantaneous bandwidth of the target clutter simulation equipment; determining the storage depth of a DDR (double data rate synchronous dynamic random access memory) selected by the digital frequency storage module according to the target simulation distance range and the size of the injection type clutter data, and determining the clock frequency of the digital frequency storage module according to the target distance simulation precision, the pulse width and the pulse repetition period measurement error; the attenuation range of the attenuator of the receive chain and the number of bits of the AD in the intermediate digital frequency storage block 1103 are performed according to the requirement of the receive instantaneous dynamic range. And determining the sampling rate of the selected DDS (direct digital frequency synthesis) chip according to the speed analog precision and the Doppler analog precision. It should be noted that, in a certain embodiment, the velocity simulation accuracy and the doppler simulation accuracy may be determined according to the requirement index.
The invention has the beneficial effects that: the target clutter simulation device comprises a switch filtering module 1101, a frequency conversion module 1102, an intermediate frequency digital frequency storage module 1103 and a control module 1104, so that the target interference simulation of a wide frequency band is realized, the radar test measurement can be realized, and the radar clutter simulation device is more helpful for the simulation training of a radar. The problem of single, the repeated development of traditional method target clutter analog equipment frequency channel is solved, this scheme universalization, standardization level are high, have solved the problem of the repeated development of different frequency channel radar target clutter analog equipment, and have increased radar parameter measurement function, have more abundant function.
Preferably, in any of the above embodiments, the switch filter module 1101 includes: the uplink switch filtering module and the downlink switch filtering module;
the downlink switch filtering module is used for receiving a first radio frequency signal to be processed, and carrying out amplitude limiting and band-pass filtering processing of a preset frequency band on the first radio frequency signal according to a first control parameter to obtain a first radio frequency signal;
and the uplink switch filtering module is used for filtering, amplifying and attenuating the second radio frequency signal according to the first control parameter to obtain a target signal.
According to the scheme, the downlink switch filtering module is used for carrying out amplitude limiting and filtering processing on the received signal, and the target clutter simulation equipment can be controlled to work in a corresponding working frequency band. And filtering, amplifying and attenuating the radio frequency signal through the uplink switch filtering module.
Preferably, in any of the above embodiments, as shown in fig. 6, the downstream switch filtering module includes: the device comprises a limiter, a first switch, a first band-pass filter bank and a second switch;
the amplitude limiter, the first switch, the first band-pass filter bank and the second switch are connected in sequence;
the first band-pass filter bank comprises a plurality of band-pass filters of different frequency bands, and the band-pass filter of each frequency band is connected with the first switch and the second switch respectively. Wherein the plurality of band pass filters of different frequency bands may include: a 1-6GHz band-pass filter, a 6-10GHz band-pass filter, a 10-14GHz band-pass filter, and a 14-18GHz band-pass filter.
It should be noted that the downlink switch filtering module performs amplitude limiting and band-pass filtering on the received signal in a corresponding frequency band, and can control the target clutter simulation equipment to operate in the corresponding operating frequency band, and after gating the signal in the frequency band, the signal is sent to the frequency conversion module 1102 for down-conversion processing
According to the scheme, the downlink switch filtering module is used for carrying out amplitude limiting and filtering processing on the received signal, and the target clutter simulation equipment can be controlled to work in a corresponding working frequency band.
Preferably, in a certain embodiment, the signal processed by the if digital frequency storage module 1103 is 1.2GHz, and the bandwidth is 1GHz, and the signal is converted into a radio frequency signal of 1 to 6GHz, or 6 to 10GHz, or 10 to 14GHz, or 14 to 18GHz by an up-conversion link of the frequency conversion module 1102, and the radio frequency signal is sent to the transmit switch filtering component for band-pass filtering and gating, and then is transmitted after being amplified and attenuated. And determining the attenuation range of the program-controlled attenuation according to the range of the amplitude fluctuation of the simulated target, namely determining the range of the amplitude fluctuation of the simulated target, and adjusting the size of the output signal to simulate the strength of the echo signal of the target.
Preferably, in any of the above embodiments, as shown in fig. 7, the upstream switch filtering module includes: the third switch, the second band-pass filter group, the fourth switch, the amplifier and the programmable attenuator;
the third switch, the second band-pass filter group, the fourth switch, the amplifier and the programmable attenuator are connected in sequence;
the programmable attenuator is respectively connected with the third switch and the fourth switch;
the second band-pass filter group comprises a plurality of band-pass filters in different frequency bands, and the band-pass filter in each frequency band is respectively connected with the third switch and the fourth switch. The plurality of different band pass filters may include: a 1-6GHz band-pass filter, a 6-10GHz band-pass filter, a 10-14GHz band-pass filter, and a 14-18GHz band-pass filter.
According to the scheme, the radio-frequency signal is filtered, amplified and attenuated through the uplink switch filtering module, and the attenuation range of program-controlled attenuation is determined according to the range of the amplitude fluctuation of the simulated target.
Preferably, in any of the above embodiments, the frequency conversion module 1102 includes: the device comprises an up-conversion module and a down-conversion module; as shown in fig. 8, the down-conversion module includes a primary frequency mixing module, a secondary frequency mixing module, and a frequency synthesizer, where the first radio frequency signal is processed by the primary frequency mixing module and then processed by the secondary frequency mixing module to output an intermediate frequency signal; the second local oscillator is input into the first frequency mixing module; as shown in fig. 9, the up-conversion module outputs a second rf signal after the input signal is subjected to primary frequency mixing and secondary frequency mixing, wherein the secondary frequency mixing result is input to the primary frequency synthesis module after passing through a local oscillator, a frequency synthesis module and two local oscillators.
The down-conversion module is used for performing down-conversion processing on the first radio-frequency signal according to the second control parameter to obtain an intermediate-frequency signal;
the up-conversion module is used for carrying out up-conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal.
According to the scheme, the intermediate frequency signal is subjected to frequency conversion processing through the frequency conversion module, and the target clutter simulation equipment is controlled to work in a corresponding working frequency band.
Preferably, in any of the above embodiments, the control module 1104 comprises: control software and a display control module; the control software is used for receiving the target simulation parameters, calculating a first control parameter, a second control parameter and a third control parameter according to the target simulation parameters, and outputting the first control parameter, the second control parameter and the third control parameter to the display control module;
the display control module is used for displaying the first control parameter, the second control parameter and the third control parameter.
In one embodiment, the data returned by the target clutter simulation device includes real-time parameters such as target signal frequency, target current distance, current speed, receiving attenuation, transmitting attenuation, monitoring data, and the return of the real-time parameters is performed at a fixed period in the target signal simulation.
In the scheme, the functions of calculating target simulation parameters and measuring the parameters are realized through a control module 1104; and the display of the loopback parameters and the monitoring data is realized through the display control module.
Preferably, in an embodiment, as shown in fig. 10, in a schematic structural diagram of the if digital frequency storage module 1103, after the if signal is subjected to ADC, wideband direct digital control, frequency measurement and spectrum analysis, the if signal is subjected to digital frequency storage processing, and then subjected to digital up-conversion and DAC processing to output the if signal. The design method of the intermediate frequency digital frequency storage module 1103 may include:
the digital frequency storage module needs to complete 3 functions of target simulation, clutter simulation and radar parameter measurement, simulates the distance information of a target echo through time delay, simulates the speed information of the target echo through adding Doppler frequency, and simulates the amplitude information of the target echo through the intensity change of a signal; simulating different clutter environments through a clutter model preset by software or injected clutter data; measuring parameters such as amplitude, pulse width and the like of a received signal through a software algorithm;
determining the instantaneous working bandwidth of the intermediate-frequency digital frequency storage module 1103 according to the instantaneous bandwidth of the target clutter simulation equipment;
determining the storage depth of the DDR selected by the digital frequency storage module according to the target simulation maximum delay tau max and the size of the injection type clutter data;
the storage depth of the DDR is equal to the number of bits of the digital frequency storage module AD and the sampling rate of the digital frequency storage module tau max,
the counting clock frequency of the digital frequency storage module determines the target distance simulation precision. The target distance analog precision is c/(2 x f), c is the speed of light, and f is the counting clock frequency of the digital frequency storage module.
The receiving instantaneous dynamic range determines the effective digit of the AD in the intermediate frequency digital storage block 1103;
wherein the content of the first and second substances,
receive instantaneous dynamic range 20 log (2 AD significand/1).
When there is no directly selectable hardware product to calculate the AD significand, a higher AD significand should be selected to meet the requirement of receiving instantaneous dynamic range.
Determining the sampling rate of the selected DDS according to the speed simulation precision and the Doppler precision;
since DDS is usually implemented by NCO (numerically controlled oscillator), n is the number of NCO bits, therefore:
the Doppler frequency precision is equal to the sampling frequency/2 ^ n of the digital frequency storage module.
It should be noted that several parameters, i.e., the instantaneous operating bandwidth, the clock frequency, the number of bits of the AD, and the sampling rate of the DDS, are determined to select the hardware of the intermediate frequency digital frequency storage module 1103.
In one embodiment, as shown in fig. 2, a target clutter simulation method includes:
receiving a first radio frequency signal to be processed, and performing first filtering processing on the first radio frequency signal according to a first control parameter to obtain a first radio frequency signal;
performing first frequency conversion processing on the first radio frequency signal according to the second control parameter to obtain an intermediate frequency signal;
performing target signal simulation processing on the intermediate frequency signal according to a third control parameter;
carrying out second frequency conversion processing on the preset intermediate frequency signal according to a second control parameter to obtain a second radio frequency signal;
carrying out second filtering processing on the second radio frequency signal according to the first control parameter to obtain a target signal;
before the first filtering process, according to the received target simulation parameter, calculating a first control parameter, a second control parameter, and a third control parameter, and sending the first control parameter to the switch filtering module 1101; sending the second control parameter to the frequency conversion module 1102; the third control parameter is sent to the if digital frequency storage block 1103.
According to the scheme, the target clutter simulation method is executed in the target clutter simulation device, the target interference simulation of a wide frequency band is realized, the radar test measurement can be realized, and the simulation training of the radar is assisted. The problem of single, the repeated development of traditional method target clutter analog equipment frequency channel is solved, this scheme universalization, standardization level are high, have solved the problem of the repeated development of different frequency channel radar target clutter analog equipment, and have increased radar parameter measurement function, have more abundant function.
Preferably, in any of the above embodiments, receiving a first radio frequency signal to be processed, and performing a first filtering process on the first radio frequency signal according to a first control parameter, to obtain the first radio frequency signal specifically includes:
carrying out amplitude limiting and band-pass filtering processing of a preset frequency band on the first radio-frequency signal according to the first control parameter to obtain a first radio-frequency signal;
performing a second filtering process on the second radio frequency signal according to the first control parameter to obtain a target signal specifically includes: and filtering, amplifying and attenuating the second radio frequency signal according to the first control parameter to obtain a target signal.
According to the scheme, the downlink switch filtering module is used for carrying out amplitude limiting and filtering processing on the received signal, and the target clutter simulation equipment can be controlled to work in a corresponding working frequency band. And filtering, amplifying and attenuating the radio frequency signal through the uplink switch filtering module.
Preferably, in any of the above embodiments, performing the first frequency conversion processing on the first radio frequency signal according to the second control parameter, and obtaining the intermediate frequency signal specifically includes:
performing down-conversion processing on the first radio frequency signal according to the second control parameter to obtain an intermediate frequency signal;
performing second frequency conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal specifically includes:
and carrying out up-conversion processing on the preset intermediate frequency signal according to a second control parameter to obtain a second radio frequency signal.
According to the scheme, the intermediate frequency signal is subjected to frequency conversion processing through the frequency conversion module 1102, and the target clutter simulation equipment is controlled to work in a corresponding working frequency band.
Preferably, in any of the above embodiments, further comprising: receiving a target simulation parameter, calculating a first control parameter, a second control parameter and a third control parameter according to the target simulation parameter, and outputting the first control parameter, the second control parameter and the third control parameter to a display control module;
and displaying the first control parameter, the second control parameter and the third control parameter.
In the scheme, the functions of calculating target simulation parameters and measuring the parameters are realized through a control module 1104; and the display of the loopback parameters and the monitoring data is realized through the display control module.
A radar testing apparatus comprising: a target clutter simulation apparatus using any of the above embodiments.
The target clutter simulation device comprises a switch filtering module 1101, a frequency conversion module 1102, an intermediate frequency digital frequency storage module 1103 and a control module 1104, so that the target interference simulation of a wide frequency band is realized, the radar test measurement can be realized, and the radar clutter simulation device is more helpful for the simulation training of a radar. The problem of single, the repeated development of traditional method target clutter analog equipment frequency channel is solved, this scheme universalization, standardization level are high, have solved the problem of the repeated development of different frequency channel radar target clutter analog equipment, and have increased radar parameter measurement function, have more abundant function.
It is understood that some or all of the alternative embodiments described above may be included in some embodiments.
It should be noted that the above embodiments are method embodiments corresponding to previous product embodiments, and for the description of each optional implementation in the method embodiments, reference may be made to corresponding descriptions in the above product embodiments, and details are not described here again.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
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. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be 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 of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. 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 Random Access Memory (RAM), a magnetic disk, or an optical disk.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A target clutter simulation apparatus, comprising: the device comprises a switch filtering module, a frequency conversion module, an intermediate frequency digital frequency storage module and a control module;
the switch filtering module, the frequency conversion module and the intermediate-frequency digital frequency storage module are sequentially connected;
the control module is respectively connected with the switch filtering module, the frequency conversion module and the intermediate-frequency digital frequency storage module;
the switch filtering module is used for receiving a first radio frequency signal to be processed and performing first filtering processing on the first radio frequency signal according to a first control parameter sent by the control module to obtain a first radio frequency signal;
the frequency conversion module is used for carrying out first frequency conversion processing on the first radio frequency signal according to a second control parameter issued by the control module to obtain an intermediate frequency signal;
the intermediate frequency digital frequency storage module is used for carrying out target signal analog processing on the intermediate frequency signal according to a third control parameter issued by the control module;
the frequency conversion module is further used for carrying out second frequency conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal;
and the switch filtering module is also used for carrying out second filtering processing on the second radio frequency signal according to the first control parameter to obtain a target signal.
2. The target clutter simulation apparatus of claim 1, wherein the switch filter module comprises: the uplink switch filtering module and the downlink switch filtering module;
the downlink switch filtering module is used for receiving a first radio frequency signal to be processed, and carrying out amplitude limiting and band-pass filtering processing of a preset frequency band on the first radio frequency signal according to a first control parameter to obtain a first radio frequency signal;
and the uplink switch filtering module is used for filtering, amplifying and attenuating the second radio frequency signal according to a first control parameter to obtain a target signal.
3. The target clutter simulation apparatus of claim 2, wherein the down switch filter module comprises: the device comprises a limiter, a first switch, a first band-pass filter bank and a second switch;
the amplitude limiter, the first switch, the first band-pass filter bank and the second switch are connected in sequence;
the first band-pass filter bank comprises a plurality of band-pass filters in different frequency bands, and the band-pass filter in each frequency band is connected with the first switch and the second switch respectively.
4. The target clutter simulation apparatus of claim 2, wherein the up switch filtering module comprises: the third switch, the second band-pass filter group, the fourth switch, the amplifier and the programmable attenuator;
the third switch, the second band-pass filter bank, the fourth switch, the amplifier and the programmable attenuator are connected in sequence;
the programmable attenuator is respectively connected with the third switch and the fourth switch;
the second band-pass filter group comprises a plurality of band-pass filters in different frequency bands, and the band-pass filter in each frequency band is connected with the third switch and the fourth switch respectively.
5. The target clutter simulation apparatus of claim 1, wherein the frequency conversion module comprises: the device comprises an up-conversion module and a down-conversion module;
the down-conversion module is used for performing down-conversion processing on the first radio frequency signal according to a second control parameter to obtain an intermediate frequency signal;
and the up-conversion module is used for carrying out up-conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal.
6. The target clutter simulation apparatus of claim 1, wherein said control module comprises: control software and a display control module;
the control software is used for receiving a target simulation parameter, calculating a first control parameter, a second control parameter and a third control parameter according to the target simulation parameter, and outputting the first control parameter, the second control parameter and the third control parameter to the display control module;
the display control module is used for displaying the first control parameter, the second control parameter and the third control parameter.
7. A target clutter simulation method, characterized in that a target clutter simulation apparatus using any one of the preceding claims 1 to 6 comprises:
receiving a first radio frequency signal to be processed, and performing first filtering processing on the first radio frequency signal according to a first control parameter issued by a control module to obtain a first radio frequency signal;
performing first frequency conversion processing on the first radio frequency signal according to a second control parameter issued by a control module to obtain an intermediate frequency signal;
performing target signal simulation processing on the intermediate frequency signal according to a third control parameter issued by a control module;
performing second frequency conversion processing on the preset intermediate frequency signal according to the second control parameter to obtain a second radio frequency signal;
and carrying out second filtering processing on the second radio frequency signal according to the first control parameter to obtain a target signal.
8. The method according to claim 7, wherein the receiving a first rf signal to be processed and performing a first filtering process on the first rf signal according to a first control parameter to obtain the first rf signal specifically comprises:
and carrying out amplitude limiting and band-pass filtering processing of a preset frequency band on the first radio-frequency signal according to the first control parameter to obtain a first radio-frequency signal.
9. The method of claim 7, wherein the second filtering the second rf signal according to the first control parameter to obtain the target signal specifically comprises: and filtering, amplifying and attenuating the second radio frequency signal according to the first control parameter to obtain a target signal.
10. A radar testing apparatus, comprising: a target clutter simulation apparatus using any of the above claims 1 to 6.
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| CN202111681653.7A CN114325618A (en) | 2021-12-30 | 2021-12-30 | Target clutter simulation device and method and radar testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115913177A (en) * | 2023-01-06 | 2023-04-04 | 宜科(天津)电子有限公司 | System for photoelectric sensor anti ambient light interference |
| CN117434426A (en) * | 2023-11-20 | 2024-01-23 | 芯火微测(成都)科技有限公司 | Test method, system and device of switched capacitor filter |
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2021
- 2021-12-30 CN CN202111681653.7A patent/CN114325618A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115913177A (en) * | 2023-01-06 | 2023-04-04 | 宜科(天津)电子有限公司 | System for photoelectric sensor anti ambient light interference |
| CN115913177B (en) * | 2023-01-06 | 2023-05-30 | 宜科(天津)电子有限公司 | System for photoelectric sensor anti-ambient light interference |
| CN117434426A (en) * | 2023-11-20 | 2024-01-23 | 芯火微测(成都)科技有限公司 | Test method, system and device of switched capacitor filter |
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