CN109343016B - W-waveband digital sum-difference injection type dynamic target simulation method and device - Google Patents
W-waveband digital sum-difference injection type dynamic target simulation method and device Download PDFInfo
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Abstract
The invention provides a W-band digital sum-difference injection type semi-physical simulation method and a device, wherein the device comprises the following components: the W-band frequency conversion module receives a radio frequency signal transmitted by a radar, converts the frequency of the signal from a W band to a baseband signal through a frequency agile local oscillator, converts the frequency of 5 paths of echo signals from the baseband signal to the W band signal, and finally transmits the signals to a tested product; the echo baseband signal generating module and the imaging modulation module sample the baseband signal after the down-conversion of the W-band frequency conversion module, and modulate a target echo parameter in a digital domain to generate a corresponding imaging echo signal; the inter-channel amplitude-phase consistency compensation module tests amplitude-phase errors among the 5 channels and generates a corresponding compensation model; the 5-path echo modulation module generates the dynamic characteristics of a 5-path echo signal simulation target according to information such as an imaging echo signal; the real-time control module controls the working process in real time according to the input signal. The invention can expand the capability of the existing semi-physical simulation system for realizing high-precision imaging target dynamic simulation in the W frequency band.
Description
Technical Field
The invention relates to the field of radar guidance, in particular to a W-band digital sum-difference injection type dynamic target simulation method and a device, which are used for detecting the imaging, identifying and tracking target capabilities of a W-band active imaging guidance digital sum-difference radar seeker in a complex environment.
Background
The W-band active imaging guidance system can realize the identification and tracking of a short-distance target, and is a novel radar short-distance accurate guidance system.
In order to detect the ability of a W-band active imaging guidance seeker to identify and track a target in a complex environment, a set of W-band active imaging target simulation method and device is needed for simulating W-band active imaging target echo (including clutter, environment and the like) information faced by a radar seeker. The device is generally divided into two modes of space radiation and direct injection, the simulation mode of the space radiation needs to shield the conditions of a darkroom, an array target simulation system and the like, the W-band signal transmission loss is large, the simulation of high power is influenced, and the system is complex and has huge cost; the injection type semi-physical simulation mode has simple structure and low cost.
The traditional radar injection type simulation method is that target echo signals received by a radar system are processed in advance to generate 3 paths of signals including signal sum, difference (azimuth) and difference (elevation), and then the signals are injected into a receiving system at the rear end of a radar system receiver (sum and difference comparator), so that target dynamic characteristic simulation is achieved. However, the digital sum and difference radar system does not adopt a sum and difference comparator to generate a sum/difference 3-path signal, but directly receives 5-path original target echo signals, and then realizes the simulation of the dynamic characteristics of the target through intermediate frequency digital signal processing of a receiving system. The invention designs a 5-channel injection method to simulate a target original echo signal received by a W-band digital sum-difference radar system, and is used for verifying the tracking and guidance performance of the digital sum-difference radar system, and simultaneously, the invention can also inject 5 paths (or 4 paths) of signals into the front end of a receiver (sum-difference comparator) of the radar system, so that the signals are used for traditional radar system injection type simulation, the test on the receiver is increased, and the simulation effect is more complete and vivid.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a W-band digital sum-difference injection type dynamic target simulation method and device, which can realize injection type simulation of a W band and further realize a semi-physical simulation test for testing imaging, identification and tracking performances of a W-band radar system in a laboratory.
The invention is realized according to the following technical scheme:
a W-band digital sum-difference injection dynamic target simulation device is characterized by comprising: the system comprises a real-time control module, an echo baseband signal generation module, an imaging modulation module, a W-band frequency conversion module, an inter-channel amplitude-phase consistency compensation module and a 5-path echo modulation module, wherein the W-band frequency conversion module receives a radio frequency signal transmitted by a radar and converts the signal from a W band to a baseband signal through a frequency agile local oscillator; the echo baseband signal generating module samples the baseband signal after the down-conversion of the W frequency conversion module, generates a digital baseband signal and transmits the digital baseband signal to the high-precision imaging modulation module; the high-precision imaging modulation module receives the digital baseband signal, modulates the imaging information of a digital domain to form a baseband signal with imaging information, and then transmits the baseband signal back to the echo baseband signal generation module to perform time delay and Doppler modulation to generate an original imaging echo baseband signal; the inter-channel amplitude-phase consistency compensation module tests amplitude-phase errors among the 5 channels and generates a corresponding amplitude-phase error compensation model, so that the 5 channels keep good amplitude-phase channel consistency, and the target dynamic simulation precision is improved; the 5-path echo modulation module modulates and generates 5-path echo digital signals in a digital domain according to an original imaging echo baseband signal, an inter-channel amplitude-phase error compensation model, target position information and directional diagram information of a tested product, carries out DA conversion on the signals into final 5-path echo baseband signals, then converts the frequency of the 5-path echo baseband signals from the baseband signals into W-band signals, and finally transmits the signals to the tested product until a stop instruction from the real-time control module is received; and the real-time control module controls the work flow and information interaction of the W frequency conversion module, the echo baseband signal generation module, the high-precision imaging modulation module, the inter-channel amplitude-phase consistency compensation module and the 5-channel echo modulation module according to the input signal.
The invention discloses a W-waveband digital sum and difference injection type target simulation method, which is used for imaging guidance control semi-physical simulation of a radar system W waveband and is realized according to the target simulation device, and is characterized by comprising the following steps of:
step S1: designing 5 paths of target echo signal transmission waveguides consistent with the polarization mode of the tested radar system, removing an antenna of the tested radar system, and connecting the waveguides with the rear end of the tested radar antenna;
step S2: designing a frequency conversion local oscillation circuit, wherein a 100MHz clock signal output by a tested radar is used as excitation for a phase-locked medium oscillator, an 11GHz signal is output to a frequency multiplier through the phase-locked medium oscillator, and the frequency multiplier outputs an 88GHz signal and is simultaneously used as local oscillation signals of a W-band up-conversion circuit and an X-band down-conversion circuit; the 100MHz signal is simultaneously used as a clock reference signal of a frequency synthesis module and a DDS module of the coherent agile frequency conversion local oscillator circuit, and phase errors caused by microwave transmission in the circuit are compensated through DDS modulation, so that the coherent agile frequency conversion local oscillator circuit outputs local oscillator signals of 3.6GHz and 8-10 GHz which are strictly coherent with signals of a radar;
step S3: designing a frequency conversion circuit, mixing the radar signal with the set working frequency of 100 +/-1 GHz with the 88GHz local oscillator signal in the step S2, and performing down-conversion to 11-13 GHz, and then mixing the radar signal with the 8-10 GHz local oscillator signal and the 3.6GHz local oscillator signal in the step S2 to obtain a baseband signal; after the baseband signal is subjected to echo modulation, the baseband signal is mixed with the local oscillation signals of 3.6GHz, 8-10 GHz and 88GHz in the step S2, and the frequency is up-converted to 100 +/-1 GHz and sent to the radar to be tested; the frequency conversion circuit needs to be integrated and tested with the frequency conversion local oscillator circuit in the step S2, so that the frequency conversion circuit meets the requirement that the radar transmitting signal is strictly coherent with the echo signal;
step S3: performing delay processing and Doppler signal modulation on the baseband signal in S3 by using an echo baseband signal generation module to simulate the distance and the speed of a target, and then performing convolution on the echo to modulate one-dimensional range profile information;
step S4: designing an inter-channel amplitude and phase error test link by using 5 paths of echo modulation modules, firstly generating signals of each test frequency point by using the 5 paths of echo modulation modules, then controlling an up-conversion link to be respectively connected with 5 down-conversion channels by using a switch, then acquiring and generating digital signals by using an AD (analog-to-digital) module and recording data, and finally generating a corresponding compensation model according to the data and completing compensation verification to ensure that the amplitude and phase consistency of each channel meets the actual requirement;
step S5: according to the target dynamic characteristic requirement, the directional diagram characteristic of the radar system and the inter-channel amplitude-phase consistency compensation model, a digital modulation method for simulating the target dynamic characteristic of 5-channel echo signals is established, and echo signals meeting the requirement of accurate simulation of the target dynamic characteristic are generated;
step S6: according to information interaction and working time sequence, a computer real-time control module is designed to control frequency switching, data calling and time sequence logic of a W frequency conversion module, an echo baseband signal generation module, a high-precision imaging modulation module, an inter-channel amplitude-phase consistency compensation module and a 5-channel echo modulation module, and meanwhile, the integration and debugging of the whole W waveband digital sum-difference injection type target simulation device are completed by combining a controlled module, and a real-time simulation test is carried out.
Compared with the prior art, the invention has the following beneficial effects:
the method provided by the invention directly injects the modulated echo to the rear end of the antenna of the tested radar, so that a space radiation link is omitted, compared with the traditional space radiation simulation method, the method saves the investment of a microwave darkroom and an antenna array, particularly, the transmission loss of a W-band signal is large, the transmission path of the space radiation method is long, and a receiver receives the W-band echo signal under the same power;
the method provided by the invention adopts a digital beam synthesis technology, the amplitude and phase control of the output signal is completed in a digital domain, and compared with the method, the space radiation method is to control the amplitude and phase of the signal on a radio frequency transmission link;
the method provided by the invention adopts a modular design, the W-band frequency conversion module is independent from other hardware modules on a hardware structure, and the frequency conversion modules with different working frequency bands are replaced universally, so that the device can be applied to the test and semi-physical simulation of radars with other working frequency bands, including an injection type and a radiation type.
The method provided by the invention is different from the traditional sum and difference injection scheme, the two difference signals of the traditional sum and difference injection scheme are processed signals, and the analog signals are not original echo signals received by a radar system; the digital sum-difference injection type 5-path signal simulation provided by the invention is the actual original echo signal received by the radar system, so that the simulation fidelity is higher.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a block diagram of a W-band digital sum and difference injection target simulation apparatus according to the present invention;
FIG. 2 is a schematic diagram of the antenna back end of the product under test and the device waveguide interface;
wherein, fig. 2(a) is a waveguide interface of a tested product; FIG. 2(b) is a waveguide interface of the device;
FIG. 3 is a schematic diagram of a W-band and X-band up-down frequency conversion local oscillation circuit;
FIG. 4 is a schematic diagram of a coherent agile local oscillator circuit;
FIG. 5 is a chain diagram of magnitude and phase error testing between channels;
FIG. 6 is a schematic diagram of a data modulation scheme;
fig. 7 is a flow chart of information interaction.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Fig. 1 is a block diagram of a W-band digital sum-difference injection type target simulation apparatus according to the present invention, and as shown in fig. 1, a W-band digital sum-difference injection type dynamic target simulation apparatus according to the present invention includes: the system comprises a real-time control module, an echo baseband signal generation module, an imaging modulation module, a W-band frequency conversion module, an inter-channel amplitude-phase consistency compensation module and a 5-path echo modulation module, wherein the W-band frequency conversion module receives a radio frequency signal transmitted by a radar and converts the signal from a W band to a baseband signal through a frequency agile local oscillator; the echo baseband signal generating module samples the baseband signal after the down-conversion of the W frequency conversion module, generates a digital baseband signal and transmits the digital baseband signal to the high-precision imaging modulation module; the high-precision imaging modulation module receives the digital baseband signal, modulates the imaging information of a digital domain to form a baseband signal with imaging information, and then transmits the baseband signal back to the echo baseband signal generation module to perform time delay and Doppler modulation to generate an original imaging echo baseband signal; the inter-channel amplitude-phase consistency compensation module tests amplitude-phase errors among the 5 channels and generates a corresponding amplitude-phase error compensation model, so that the 5 channels keep good amplitude-phase channel consistency, and the target dynamic simulation precision is improved; the 5-path echo modulation module modulates and generates 5-path echo digital signals in a digital domain according to an original imaging echo baseband signal, an inter-channel amplitude-phase error compensation model, target position information and directional diagram information of a tested product, carries out DA conversion on the signals into final 5-path echo baseband signals, then converts the frequency of the 5-path echo baseband signals from the baseband signals into W-band signals, and finally transmits the signals to the tested product until a stop instruction from the real-time control module is received; and the real-time control module controls the work flow and information interaction of the W frequency conversion module, the echo baseband signal generation module, the high-precision imaging modulation module, the inter-channel amplitude-phase consistency compensation module and the 5-channel echo modulation module according to the input signal.
The invention discloses a W-waveband digital sum and difference injection type target simulation method, which is used for imaging guidance control semi-physical simulation of a radar system W waveband and is realized according to the target simulation device, and is characterized by comprising the following steps of:
step S1: designing 5 paths of target echo signal transmission waveguides consistent with the polarization mode of the tested radar system, removing an antenna of the tested radar system, and connecting the waveguides with the rear end of the tested radar antenna;
step S2: designing a frequency conversion local oscillation circuit, wherein a 100MHz clock signal output by a tested radar is used as excitation for a phase-locked medium oscillator, an 11GHz signal is output to a frequency multiplier through the phase-locked medium oscillator, and the frequency multiplier outputs an 88GHz signal and is simultaneously used as local oscillation signals of a W-band up-conversion circuit and an X-band down-conversion circuit; the 100MHz signal is simultaneously used as a clock reference signal of a frequency synthesis module and a DDS module of the coherent agile frequency conversion local oscillator circuit, and phase errors caused by microwave transmission in the circuit are compensated through DDS modulation, so that the coherent agile frequency conversion local oscillator circuit outputs local oscillator signals of 3.6GHz and 8-10 GHz which are strictly coherent with signals of a radar;
step S3: designing a frequency conversion circuit, mixing the radar signal with the set working frequency of 100 +/-1 GHz with the 88GHz local oscillator signal in the step S2, and performing down-conversion to 11-13 GHz, and then mixing the radar signal with the 8-10 GHz local oscillator signal and the 3.6GHz local oscillator signal in the step S2 to obtain a baseband signal; after the baseband signal is subjected to echo modulation, the baseband signal is mixed with the local oscillation signals of 3.6GHz, 8-10 GHz and 88GHz in the step S2, and the frequency is up-converted to 100 +/-1 GHz and sent to the radar to be tested; the frequency conversion circuit needs to be integrated and tested with the frequency conversion local oscillator circuit in the step S2, so that the frequency conversion circuit meets the requirement that the radar transmitting signal is strictly coherent with the echo signal;
step S3: performing delay processing and Doppler signal modulation on the baseband signal in S3 by using an echo baseband signal generation module to simulate the distance and the speed of a target, and then performing convolution on the echo to modulate one-dimensional range profile information;
step S4: designing an inter-channel amplitude and phase error test link by using 5 paths of echo modulation modules, firstly generating signals of each test frequency point by using the 5 paths of echo modulation modules, then controlling an up-conversion link to be respectively connected with 5 down-conversion channels by using a switch, then acquiring and generating digital signals by using an AD (analog-to-digital) module and recording data, and finally generating a corresponding compensation model according to the data and completing compensation verification to ensure that the amplitude and phase consistency of each channel meets the actual requirement;
step S5: according to the target dynamic characteristic requirement, the directional diagram characteristic of the radar system and the inter-channel amplitude-phase consistency compensation model, a digital modulation method for simulating the target dynamic characteristic of 5-channel echo signals is established, and echo signals meeting the requirement of accurate simulation of the target dynamic characteristic are generated;
step S6: according to information interaction and working time sequence, a computer real-time control module is designed to control frequency switching, data calling and time sequence logic of a W frequency conversion module, an echo baseband signal generation module, a high-precision imaging modulation module, an inter-channel amplitude-phase consistency compensation module and a 5-channel echo modulation module, and meanwhile, the integration and debugging of the whole W waveband digital sum-difference injection type target simulation device are completed by combining a controlled module, and a real-time simulation test is carried out.
Specifically, fig. 2(a) is a waveguide interface of a tested product, fig. 2(b) is a waveguide interface of a device, and a polarization mode and a geometric dimension of a docking interface of the device and a tested radar are designed according to a polarization mode and a geometric dimension of a waveguide interface at the rear end of a radar antenna.
Fig. 3 shows an embodiment of the present invention, the apparatus first selects a crystal oscillator (100MHz), then changes the frequency from 100MHz to 11GHz by designing a phase-locked medium oscillator, then changes the 11GHz signal to 88GHz by using a frequency converter (8 frequency doubling) for down-converting the radar signal (assuming the operating frequency of 100 ± 1GHz) to 11-13 GHz, and then changes the processed echo signal from 11-13 GHz back to 100 ± 1 GHz. Because the same signal (88GHz) is adopted in the up-down frequency conversion, the phase error between the radar and the device can be eliminated.
In fig. 4, the frequency synthesizer and the DDS both use a 100MHz clock synchronization signal of the radar, so that signals generated by the DDS and the frequency synthesizer are coherent with the radar, and then phase errors caused by the switch, the filter, the mixer, and the cable are compensated by the modulation of the DDS, so that signals of 3.6GHz and 8-10 GHz output by the device are strictly coherent with the signal of the radar.
The working frequency of the W wave band of the radar system assumes 100 +/-1 GHz, and the device receives signals transmitted by the radar and mixes the signals with 88GHz signals to generate signals of 11-13 GHz. Then, the 11-13 GHz signals are subjected to mixing down-conversion processing with 8-10 GHz and 3.6GHz in the figure 3, and baseband signals are obtained. And after the baseband signal is subjected to echo modulation, the baseband signal is mixed with signals of 3.6GHz, 8-10 GHz and 88GHz, and the signals are subjected to up-conversion to become 100 +/-1 GHz and are sent to the tested radar.
In fig. 5, the normal workflow of the device is: the device receives radar signals, namely the radar signals are arranged at the upper left corner of a graph 4, then the radar signals are mixed with local oscillator signals of 88GHz, 8-10 GHz and 3.6GHz, the frequency is down converted into intermediate frequency signals (within the range of 0.1-1.1 GHz), and the intermediate frequency signals are subjected to AD sampling to be converted into digital signals; and then the digital intermediate frequency signal completes 5 paths of imaging and other parameter (such as speed and time delay) modulation in a digital domain to generate 5 paths of echo signals, then the digital signal is converted into an analog signal through DA, and finally the analog signal is mixed with local oscillation signals of 3.6GHz, 8-10 GHz and 88GHz, and the frequency is up-converted into 100 +/-1 GHz to be sent to the tested radar. In the process, amplitude-phase differences exist among devices and cables of different echo signal links (1-5) at different frequencies, so that distortion of imaging and dynamic characteristic simulation can be caused.
In the traditional method, a standard instrument is adopted to measure and record 5 paths of echo signals at different frequency points respectively, and then the echo signals are checked, so that the method is large in workload, long in test period and capable of increasing test errors. The device adopts an imaging/baseband modulation module to generate signals of each test frequency point, then digital signals are generated in an AD module and data recording is carried out through each up-conversion channel and each down-conversion channel (switch control channels 1-5), and finally a compensation model is generated according to data and compensation verification is completed. The method does not use an external standard instrument, and the whole calibration process has short period and high precision.
FIG. 6 shows the principle of digital modulation, assuming that the raw signal data of the radar is s0，
s0＝[x1,x2,…,xn](1)
The echo modulated data of the signal is then srAnd the compensation data of the channel consistency compensation module is c,
sr＝[k1,k2,…,kn](2)
c＝[m1,m2,…,mn](3)
in the DDS, the final echo signal can be realized by simple digital processing
sc＝s0+sr+c (4)
Fig. 7 is a flow chart of information interaction among modules in a working cycle of the device: 1) firstly, a real-time control module sends control words of a filter gating branch to a W frequency conversion module according to a tested radar working frequency point, and the W-band frequency conversion module receives radar signals and then performs down-conversion processing on the radar signals to generate baseband signals; 2) the echo baseband signal generation module carries out AD sampling on the baseband signal to generate a digital baseband signal and sends the digital baseband signal to the high-precision imaging modulation module; 3) after the high-precision imaging modulation module performs imaging convolution modulation on the digital baseband signal, the digital baseband signal with the imaging information is sent back to the echo baseband signal generation module; 4) the echo baseband signal generation module receives the target distance information and the speed information sent by the real-time control module, and performs modulation processing such as time delay and Doppler on the baseband signal with the imaging information to generate an original imaging echo baseband signal; 5) the inter-channel amplitude-phase consistency compensation module calls a corresponding compensation model according to waveform parameter information of a tested product and sends the compensation model to the 5-channel echo modulation module, the 5-channel echo modulation module performs target dynamic characteristic digital modulation on a principle imaging echo baseband signal according to target angle information, antenna directional diagram information of the tested product and the like, and finally performs DA conversion and output to generate 5-channel echo baseband signals; 6) and the W-band frequency conversion module up-converts the 5 paths of echo baseband signals to generate 5 paths of echo signals, and the 5 paths of echo signals are sent back to the tested radar product to complete one period of work.
According to a specific embodiment of the invention, a certain radiation distance is required for W-band radiation type target simulation to meet a far-field condition, however, attenuation of W-band radio-frequency signals during long-distance transmission is very large, if simulation of maximum power of 0dBmW is to be realized, large power amplifier cascade is required, but large power amplifier cascade can cause signal phase fluctuation to reduce phase coherence, so that simulation of a high-precision imaging target is influenced; in addition, the radial method requires an additional target simulation channel to simulate multiple dynamic targets, which is costly. On one hand, the injection type target simulation can avoid the long-distance transmission attenuation of signals and realize the simulation of high power such as 10 dBmW; on the other hand, the simulation of a plurality of dynamic targets can be realized at low cost without adding any channel.
The two difference signals of the transmission and difference injection type are processed signals, and the simulation is not the original echo signal received by the radar system; the 5-path signal of the digital sum and difference injection type simulates the actual original echo signal received by the radar system, so that the simulation fidelity is higher. Meanwhile, the method can also be used for the injection simulation of the traditional radar system.
The invention has more complex design and research process, but is very convenient and efficient in practical use. The invention accurately simulates the real-time change of target information by injecting 5 paths of echo signals of target signals into a tested product, and detects the capability of the W-band active imaging guidance seeker in imaging, identifying and tracking the target in a complex environment.
The invention can solve the problem that the radiation system is huge and complex; compared with the traditional sum-difference injection mode, the echo signal is more real, and the test on the tested product is more complete.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (2)
1. A W-band digital sum-difference injection dynamic target simulation device is characterized by comprising: the system comprises a real-time control module, an echo baseband signal generation module, an imaging modulation module, a W-band frequency conversion module, an inter-channel amplitude-phase consistency compensation module and a 5-path echo modulation module, wherein the W-band frequency conversion module receives a radio frequency signal transmitted by a radar and converts the signal from a W band to a baseband signal through a frequency agile local oscillator; the echo baseband signal generating module samples the baseband signal after the down-conversion of the W frequency conversion module, generates a digital baseband signal and transmits the digital baseband signal to the high-precision imaging modulation module; the high-precision imaging modulation module receives the digital baseband signal, modulates the imaging information of a digital domain to form a baseband signal with imaging information, and then transmits the baseband signal back to the echo baseband signal generation module to perform time delay and Doppler modulation to generate an original imaging echo baseband signal; the inter-channel amplitude-phase consistency compensation module tests amplitude-phase errors among the 5 channels and generates a corresponding amplitude-phase error compensation model, so that the 5 channels keep good amplitude-phase channel consistency, and the target dynamic simulation precision is improved; the 5-path echo modulation module modulates and generates 5-path echo digital signals in a digital domain according to an original imaging echo baseband signal, an inter-channel amplitude-phase error compensation model, target position information and directional diagram information of a tested product, carries out DA conversion on the signals into final 5-path echo baseband signals, then converts the frequency of the 5-path echo baseband signals from the baseband signals into W-band signals, and finally transmits the signals to the tested product until a stop instruction from the real-time control module is received; and the real-time control module controls the work flow and information interaction of the W frequency conversion module, the echo baseband signal generation module, the high-precision imaging modulation module, the inter-channel amplitude-phase consistency compensation module and the 5-channel echo modulation module according to the input signal.
2. A W-band digital sum and difference injection type target simulation method is used for imaging guidance control semi-physical simulation of a radar system W-band and is realized according to the target simulation device of claim 1, and is characterized by comprising the following steps:
step S1: designing 5 paths of target echo signal transmission waveguides consistent with the polarization mode of the tested radar system, removing an antenna of the tested radar system, and connecting the waveguides with the rear end of the tested radar antenna;
step S2: designing a frequency conversion local oscillation circuit, wherein a 100MHz clock signal output by a tested radar is used as excitation for a phase-locked medium oscillator, an 11GHz signal is output to a frequency multiplier through the phase-locked medium oscillator, and the frequency multiplier outputs an 88GHz signal and is simultaneously used as local oscillation signals of a W-band up-conversion circuit and an X-band down-conversion circuit; the 100MHz signal is simultaneously used as a clock reference signal of a frequency synthesis module and a DDS module of the coherent agile frequency conversion local oscillator circuit, and phase errors caused by microwave transmission in the circuit are compensated through DDS modulation, so that the coherent agile frequency conversion local oscillator circuit outputs local oscillator signals of 3.6GHz and 8-10 GHz which are strictly coherent with signals of a radar;
step S3: designing a frequency conversion circuit, mixing the radar signal with the set working frequency of 100 +/-1 GHz with the 88GHz local oscillator signal in the step S2, and performing down-conversion to 11-13 GHz, and then mixing the radar signal with the 8-10 GHz local oscillator signal and the 3.6GHz local oscillator signal in the step S2 to obtain a baseband signal; after the baseband signal is subjected to echo modulation, the baseband signal is mixed with the local oscillation signals of 3.6GHz, 8-10 GHz and 88GHz in the step S2, and the frequency is up-converted to 100 +/-1 GHz and sent to the radar to be tested; the frequency conversion circuit needs to be integrated and tested with the frequency conversion local oscillator circuit in the step S2, so that the frequency conversion circuit meets the requirement that the radar transmitting signal is strictly coherent with the echo signal;
step S3: performing delay processing and Doppler signal modulation on the baseband signal in S3 by using an echo baseband signal generation module to simulate the distance and the speed of a target, and then performing convolution on the echo to modulate one-dimensional range profile information;
step S4: designing an inter-channel amplitude and phase error test link by using 5 paths of echo modulation modules, firstly generating signals of each test frequency point by using the 5 paths of echo modulation modules, then controlling an up-conversion link to be respectively connected with 5 down-conversion channels by using a switch, then acquiring and generating digital signals by using an AD (analog-to-digital) module and recording data, and finally generating a corresponding compensation model according to the data and completing compensation verification to ensure that the amplitude and phase consistency of each channel meets the actual requirement;
step S5: according to the target dynamic characteristic requirement, the directional diagram characteristic of the radar system and the inter-channel amplitude-phase consistency compensation model, a digital modulation method for simulating the target dynamic characteristic of 5-channel echo signals is established, and echo signals meeting the requirement of accurate simulation of the target dynamic characteristic are generated;
step S6: according to information interaction and working time sequence, a computer real-time control module is designed to control frequency switching, data calling and time sequence logic of a W frequency conversion module, an echo baseband signal generation module, a high-precision imaging modulation module, an inter-channel amplitude-phase consistency compensation module and a 5-channel echo modulation module, and meanwhile, the integration and debugging of the whole W waveband digital sum-difference injection type target simulation device are completed by combining a controlled module, and a real-time simulation test is carried out.
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| CN111537971B (en) * | 2020-06-22 | 2023-06-23 | 中国电子科技集团公司第十四研究所 | Quick compensation circuit and method for amplitude-phase characteristics of delay component |
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