CN115047417B - Method and system for simulating radar echo and interference - Google Patents
Method and system for simulating radar echo and interference Download PDFInfo
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- CN115047417B CN115047417B CN202210973869.9A CN202210973869A CN115047417B CN 115047417 B CN115047417 B CN 115047417B CN 202210973869 A CN202210973869 A CN 202210973869A CN 115047417 B CN115047417 B CN 115047417B
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The invention provides a method and a system for simulating radar echo and interference, which comprises the steps of receiving a signal sent by a target radar to obtain a received signal; collecting and measuring the received signals to obtain a plurality of Pulse Description Words (PDW); based on the pulse description word PDW, sorting each pulse to obtain a sorting result; simulating an echo signal of the target radar based on the pulse description word PDW, the sorting result and an echo control parameter; generating an interference signal of the target radar based on the pulse description word PDW, the sorting result and an interference control parameter; transmitting the echo signal and/or the interference signal; the method provides a low-cost solution for radar technology system verification and functional performance verification.
Description
Technical Field
The invention relates to the technical field of radar simulation, in particular to a method and a system for simulating radar echo and interference.
Background
With the development of science and technology, radar is more and more important as an indispensable strategic weapon. The radar is mainly used for monitoring the environment and acting on the environment. Therefore, it is crucial for the radar to determine its monitoring performance. Generally, to acquire the monitoring performance of the radar, an environment needs to be actually detected, and then the actual detection result is compared with the detection result of the radar to determine the monitoring performance of the radar. In addition, the detection results of other radars with higher accuracy can be used as the standard detection result, and then the monitoring performance of the detected radar can be determined by comparing the standard detection result with the detection result of the detected radar. However, detection by other radars, whether actual or actual, is costly and not accurate.
In view of this, some embodiments in the present specification provide a method and a system for simulating radar echoes and interferences, so as to provide a low-cost solution for radar technology system verification and functional performance verification.
Disclosure of Invention
The invention aims to provide a method for simulating radar echo and interference, which comprises the steps of receiving a signal sent by a target radar to obtain a received signal; collecting and measuring the received signals to obtain a plurality of pulse description words PDW; based on the pulse description word PDW, sorting each pulse to obtain a sorting result; simulating an echo signal of the target radar based on the pulse description word PDW, the sorting result and an echo control parameter; generating an interference signal of the target radar based on the pulse description word PDW, the sorting result and an interference control parameter; transmitting the echo signal and/or the interference signal.
Further, the obtaining of the multiple pulse description words PDW includes performing smoothing processing on the baseband signal envelope of the channel to be detected to obtain smooth signals of multiple channels; performing threshold detection on the plurality of smooth signals to obtain a plurality of threshold-crossing envelope signals; processing the multiple threshold-crossing envelope signals to obtain multiple coarse detection signals; and performing parameter measurement on the plurality of coarse detection signals to obtain the plurality of pulse description words PDW.
Further, the obtaining the plurality of coarse detection signals includes determining a plurality of time slices, and for each time slice: determining the channel with the maximum energy in the time slice based on the over-threshold envelope signal; determining the width of the signal in the channel with the maximum energy, and when the width of the signal is greater than a threshold value, taking the signal as a coarse detection signal; zeroing a signal extracted as a coarse detection signal from the threshold-crossing envelope signal; and repeatedly screening other coarse detection signals in the time slice until a preset number of coarse detection signals are obtained or no threshold signal is generated in the time slice.
Further, the pulse description word PDW includes a frequency f of the pulse, and performing parameter measurement on the coarse detection signal to obtain the frequency f of the pulse, including determining a real part and an imaginary part of the pulse based on a baseband complex signal of the pulse; calculating the phases of the real part and the imaginary part to obtain the phase of the pulse; performing first order difference on the phase to obtain the initial frequency of the pulse; and carrying out wild value removal processing on the initial frequency to obtain the frequency f of the pulse.
Further, the step of removing the wild value comprises the steps of sampling the initial frequency and determining the phase difference between the n +1 th point and the n th point of adjacent sampling points; determining whether the phase difference is greater than a threshold value; if yes, taking the frequency average value of the first 8 points of the (n + 1) th point as the frequency of the (n + 1) th point.
Further, the step of sorting each pulse based on the pulse description word PDW to obtain a sorting result includes the steps of pre-sorting the pulse description word PDW based on a known radar database to screen out pulses of known radar signals; pre-sorting pulse description words PDW of unknown radar signals based on a radar parameter knowledge base, and screening out pulses of unknown radar signals; performing main sorting processing on radar signals to obtain radiation source characteristic parameters of the radar signals; based on the characteristic parameters of the radiation sources, classifying and identifying the radiation sources to obtain a sorting result of the radiation sources; the sorting result comprises the model, type, individual identity, threat level and confidence of the target radar.
Further, the simulating the echo signal of the target radar comprises receiving an echo control parameter; generating echo working parameters according to the echo control parameters; the echo working parameters comprise the working frequency range and the working time sequence of the echo signal; according to the pulse description word PDW and the sorting result, performing echo modulation on corresponding pulses to obtain initial echo signals; processing the initial echo signal to generate an echo signal; and processing the echo signal based on the echo working parameter, and outputting the processed echo signal.
Further, the generating of the interference signal of the target radar includes receiving an interference control parameter; generating interference working parameters according to the interference control parameters; the interference working parameters comprise working frequency ranges and working time sequences of the interference signals; according to the pulse description word PDW and the sorting result, carrying out interference modulation on the corresponding pulse to obtain an initial interference signal; processing the initial interference signal to generate an interference signal; and processing the interference signal based on the interference working parameter, and outputting the processed interference signal.
The invention aims to provide a system for simulating radar echo and interference, which comprises a signal acquisition and measurement module, a signal sorting and identification module, a radar echo simulation module, an interference signal generation module and a signal transmitting module; the signal acquisition and measurement module is used for receiving signals sent by a target radar to obtain received signals; collecting and measuring the received signals to obtain a plurality of pulse description words PDW; the signal sorting and identifying module is used for sorting each pulse based on the pulse description word PDW to obtain a sorting result; the radar echo simulation module is used for simulating an echo signal of the target radar based on the pulse description word PDW, the sorting result and an echo control parameter; the interference signal generation module is used for generating an interference signal of the target radar based on the pulse description word PDW, the sorting result and an interference control parameter; the signal transmitting module is used for transmitting the echo signal and/or the interference signal.
Furthermore, the system also comprises a display module, a control module, a log management module and a database management module; the display module is at least used for situation display, frequency spectrum data display, pulse parameter analysis display, sorting result display and database interface display; the control module is used for receiving a control instruction of a user, issuing a control parameter based on the control instruction and receiving PDW data; the log management module is used for recording the running condition of the system; the database management module is at least used for managing a known radar database and a radar parameter knowledge base.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
some embodiments in this specification provide a low-cost solution for radar technology system verification and functional performance verification by simulating a real battlefield complex electromagnetic environment.
Drawings
Fig. 1 is an exemplary flowchart of a method for simulating radar echoes and interference according to some embodiments of the invention;
fig. 2 is an exemplary diagram of obtaining a plurality of pulse description words PDW according to some embodiments of the invention;
FIG. 3 is an exemplary diagram of obtaining sorting results provided by some embodiments of the present invention;
fig. 4 is an exemplary block diagram of a system for simulating radar echo and interference according to some embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Fig. 1 is an exemplary flowchart of a method for simulating radar echoes and interference according to some embodiments of the invention. In some embodiments, the process 100 may be performed by the system 400. As shown in fig. 1, the process 100 includes the following steps:
and step 110, receiving a signal sent by the target radar to obtain a received signal. In some embodiments, step 110 may be performed by signal acquisition measurement module 410.
The target radar may refer to a radar that needs to be echoed or interfered.
And 120, acquiring and measuring the received signals to obtain a plurality of pulse description words PDW. In some embodiments, step 120 may be performed by signal acquisition measurement module 410.
Collecting measurements may refer to processing received signals and obtaining parameters of the received signals. The pulse description word PDW may include various parameters describing the pulse. The pulse description word PDW may include, but is not limited to, pulse amplitude PA, pulse width PW, time of arrival TOA of the pulse, frequency f of the pulse, and the like. For more on obtaining the plurality of pulse description words PDW, refer to fig. 2 and its associated description.
And step 130, based on the pulse description word PDW, sorting each pulse to obtain a sorting result. In some embodiments, step 130 may be performed by the signal sort identification module 420.
The sorting process may refer to sorting the signals. The sorting result may be used to characterize the target radar. The sorting results may include, but are not limited to, model, type, individual identity, threat level, confidence level, etc. of the target radar. For more details on the sorting results, refer to fig. 3 and its related description.
And 140, simulating an echo signal of the target radar based on the pulse description word PDW, the sorting result and the echo control parameter. In some embodiments, step 140 may be performed by radar echo simulation module 430.
The echo control parameter may refer to a parameter that controls echo. In some embodiments, the display and control interface may provide a control interface for radar echo parameters, and a user may select and send the echo parameters through the display and control interface.
The echo signal may refer to a simulated signal sent to the target radar.
In some embodiments, the radar echo simulation module may receive echo control parameters. And generating echo working parameters according to the echo control parameters. The echo operating parameter may refer to a parameter that instructs the system to operate. In some embodiments, the echo operating parameters may be derived by parsing the echo control parameters. The echo operating parameters may include, but are not limited to, an operating frequency band and an operating timing of the echo signal. And performing echo modulation on the corresponding pulse according to the pulse description word PDW and the sorting result to obtain an initial echo signal. Echo modulation may refer to determining pulses of a transmitted signal to process an initial echo signal to generate an echo signal; and processing the echo signal based on the echo working parameter, and outputting the processed echo signal.
For example, a speed and distance two-dimensional false target modulation technology is used, and a moving false target is formed in a specific receiving sector of a target radar, so that a track is formed. Based on echo working parameters, the signals are modulated to modulate a simulation target to form Doppler characteristics, amplitude fluctuation characteristics, motion characteristics and the like, and a track is formed at the position of a characteristic sector.
In some embodiments, the target simulation may be equivalent to modeling the echo signal at the receiver input, reflecting in the model the effect of the radar operating environment modulation and the radar antenna modulation on the transmitted signal, and then determining the echo signal based on the effect. The influence of the radar working environment modulation includes, but is not limited to, antenna beam scanning pointing, simulation of radar beam transmission, and meeting process with a scene to obtain meeting data of a target and an environment. The effects of radar antenna modulation may include, but are not limited to, a pattern model of the antenna's directivity pattern, a model of the radar platform under test, a model of the radar receive channel, and the like.
In some embodiments, the target radar may be a broadband radar, and since broadband radars have high resolution, the target may be considered a composite of multiple scattering centers. For echo signals of a multi-scattering point target, the echo signals of a plurality of scattering points respectively considering different delays and Doppler can be formed by coherent superposition.
Since the range voltage coefficient of a target is influenced by the radar cross section area, the antenna gain, the distance and the propagation attenuation factor of the target, the Doppler frequency of the target is related to the position and the relative speed of the target and the radar, and the delay time of the target is related to the distance. Therefore, in order to comprehensively and accurately simulate the echo signal of the target, in some embodiments, a target sectional area fluctuation model, a target antenna pattern modulated model, a target motion model and a radar transmission waveform can be respectively established. The point target radar cross-sectional area (RCS) fluctuation model may include a swerving fluctuation model, among others.
In some embodiments, a mathematical model of the circular motion of the target may be established based on the rate of motion of the target, the radius of motion, and the equation of the plane in which the circular motion lies.
In some embodiments, in order to establish a more realistic motion model of the target, the relevant motion parameters of the target in space flight may also be obtained. For example, for ballistic flight, the motion model may be solved taking into account the disomic problem.
And 150, generating an interference signal of the target radar based on the pulse description word PDW, the sorting result and the interference control parameter. In some embodiments, step 150 may be performed by interference signal generation module 440.
The interference control parameter may refer to a parameter for generating an interference signal. In some embodiments, the user may enter the disturbance control parameter via the display module.
In some embodiments, the interference signal generation module 440 may receive an interference control parameter; generating interference working parameters according to the interference control parameters; the interference working parameters comprise the working frequency range and the working time sequence of the interference signals; according to the pulse description word PDW and the sorting result, carrying out interference modulation on the corresponding pulse to obtain an initial interference signal; processing the initial interference signal to generate an interference signal; and processing the interference signal based on the interference working parameter, and outputting the processed interference signal. The interference control parameters may include a manner and type for representing the interfering target radar. The interference operating parameters may be identified by the system for interference based on the needs of the user. The initial interference signal may refer to a signal with a frequency, noise, or the like that meets interference requirements. The processing of the initial interference signal may refer to performing delay control, doppler modulation, and the like on the initial interference signal.
In some embodiments, the interfering signal may be generated by a sample acquisition technique, a generic noise interferer technique, a generic coherent interferer technique, or the like.
In some embodiments, the DRFM can down-convert the received signal to an intermediate frequency signal that is conveniently digitally sampled and then digitize the intermediate frequency signal. The digital signal is stored in a memory and transmitted to a computing unit. The calculation unit can optionally analyze and modulate the signal as required by the interference technique employed. The modulated signal is converted back to an analog intermediate frequency signal, and then the intermediate frequency signal is up-converted to the received frequency by using a local oscillator used in the down-conversion. The same local oscillator signal is used to ensure the phase coherence of the signal in the down-conversion and up-conversion processes.
After down-conversion and sampling are carried out on radar transmitting signals, an interference source module carries out distance, amplitude and Doppler modulation according to modulation parameters sent by system control to generate interference signals, then the interference signals are sent out through D/A, and the interference signals are transmitted as target echoes by corresponding radiation units after up-conversion.
In step 160, an echo signal and/or an interference signal is transmitted. In some embodiments, step 160 may be performed by signal transmission module 450.
In some embodiments, the echo signal and/or the interference signal may be transmitted out through an antenna.
Fig. 2 is an exemplary diagram of obtaining a plurality of pulse description words PDW according to some embodiments of the invention. In some embodiments, the flow illustrated in fig. 2 may be performed by the signal acquisition measurement module 410. As shown in fig. 2, the process includes the following steps:
and carrying out smoothing processing on the baseband signal envelope of the channel to be detected to obtain smooth signals of a plurality of channels.
The channel to be examined may refer to a channel that needs to be detected. The channel to be examined can be determined by experience and practical requirements. Smoothing may be used to reduce noise-induced envelope fluctuations in the received signal and the number of times the received signal is split by the threshold. In some embodiments, the smoothing process is as follows:
wherein, the first and the second end of the pipe are connected with each other,
is the data before the smoothing is performed,
is the smoothed data. In some embodiments of the present invention, the,
。
and performing threshold detection on the plurality of smooth signals to obtain a plurality of threshold-crossing envelope signals.
Threshold detection may be used to detect pulses in a signal. The over-threshold envelope signal may refer to a signal consisting of pulses in the signal that are greater than a threshold value. In some embodiments, the pulse value of the portion of the smoothed signal where the envelope is lower than the threshold may be set to 0, while the pulse value of the portion where the envelope is over the threshold remains unchanged from the original smoothed envelope. The threshold may be set empirically.
And processing the multiple threshold-crossing envelope signals to obtain multiple coarse detection signals.
In some embodiments, the signal acquisition measurement module may determine a plurality of time slices, for each time slice: determining the channel with the maximum energy in the time segment based on the threshold envelope signal; determining the width of a signal in a channel with the largest energy, and taking the signal as a coarse detection signal when the width of the signal is greater than a threshold value; setting the signal extracted as the coarse detection signal in the threshold-crossing envelope signal to zero; and repeatedly screening other coarse detection signals in the time slice until a preset number of coarse detection signals are obtained or no threshold signal is generated in the time slice.
The time slices may be obtained by dividing the signal by time. For example, in a time slice, a channel with the largest energy can be found based on the threshold envelope, a signal starting point is searched in the channel, a signal ending point is searched backwards from the signal starting point, if the width of the signal is larger than a certain threshold value, a signal is considered to be roughly detected, and the parameter measurement is carried out on the complex signal. After searching, zero-setting the section of the channel 'threshold envelope' to prevent the channel from being repeatedly detected; and searching the channel with the maximum energy in the time period again, repeating the process, and searching for four signals at most in the same time period. If no channel energy in a certain time slice exceeds the threshold or 4 signals are detected at the current moment, the time slice is directly stepped backwards.
And carrying out parameter measurement on the plurality of coarse detection signals to obtain a plurality of pulse description words PDW.
In some embodiments, the fine search may be performed in a direction of half the pulse height according to the detected leading and trailing edges of the pulse as a coarse value. And (3) taking the average amplitude of signals (threshold points) in the front edge and the rear edge of the pulse subjected to the rough detection as PA, taking the intersection point of PA/2 and the pulse amplitude as the front edge and the rear edge of the pulse to obtain TOA and PW, and carrying out frequency measurement, modulation mode and other intra-pulse information identification by using the new complex signals in the front edge and the rear edge.
In some embodiments, the pulse description word PDW may include a frequency f of the pulse, and performing a parameter measurement on the coarse detection signal to obtain the frequency f of the pulse includes determining a real part and an imaginary part of the pulse based on a baseband complex signal of the pulse; calculating the phases of the real part and the imaginary part to obtain the phase of the pulse; carrying out first-order difference on the phase to obtain the initial frequency of the pulse; and (4) carrying out wild value removal processing on the initial frequency to obtain the frequency f of the pulse.
For example, the baseband complex signal of the pulse obtained from PA, TOA and PW is
Where f is the instantaneous frequency, considered constant for a short time,
is the sampling interval.
The real and imaginary parts are respectively
And
then can be based on
And
and calculating the phase of the pulse, and then carrying out first-order difference on the phase of the pulse to obtain the frequency of the pulse. Illustratively, calculating the phase includes inverse tangent and deconvolution: by using arc tangentThe phase of the output is
In between, the unambiguous phase needs to be recovered, i.e. the deconvolution. Then the
The ambiguity problem exists because of the instantaneous frequency measurement result: when the signal is near the edge of the channel, i.e. the frequency is relatively high with respect to the sampling rate, the phase difference between adjacent sampling points, i.e. the probability of cycle ambiguity of the instantaneous frequency, increases. For signals with low signal-to-noise ratio or phase encoding, the measured value will be larger than the actual value, so one-step de-wild value processing is needed for the frequency measurement result.
In some embodiments, the de-wild value processing comprises sampling the initial frequency and determining the phase difference between the n +1 th point and the nth point of adjacent sampling points; determining whether the phase difference is greater than a threshold value; if yes, the frequency average value of the first 8 points of the (n + 1) th point is taken as the frequency of the (n + 1) th point.
For example, the sampling rate after channelization is 46.875Msps, which may be 0.22, calculated according to the signal bandwidth not exceeding 10 MHz; when the phase difference between the 10 th sampling point and the 9 th sampling point is greater than 0.22, the average frequency of the 2 nd to 9 th sampling points can be used as the frequency of the 10 th sampling point.
Fig. 3 is an exemplary diagram of obtaining a sorting result according to some embodiments of the present invention. In some embodiments, the process 300 illustrated in fig. 3 may be performed by the signal sort identification module 420. And the PDW parameters are sent to a signal sorting and identifying module, and the signal sorting and identifying module carries out radiation source sorting, parameter estimation, radiation source identification, threat degree judgment, combat situation judgment and the like on the input real-time PDW signal flow according to different radars and radar signal characteristics. And finally, displaying, storing and recording a signal processing result. The sorting process includes three aspects of signal preprocessing, main sorting process and radiation source identification, and the basic flow and the working principle are shown in fig. 3, and the flow 300 includes the following steps:
and pre-sorting the pulse description word PDW based on a known radar database, and screening out the pulse of a known radar signal.
And (3) pre-sorting pulse description words PDW of unknown radar signals based on a radar parameter knowledge base, and screening out pulses of unknown radar signals.
The pre-sorting process comprises the following steps: firstly, rapidly matching and comparing pulse parameters input in real time with prior knowledge and prior information (database of known radar) of various known radars, and loading the pulse parameters into various buffers in different categories according to matching and comparing results; placing separated known radar signals PDW which accord with the characteristics of a radar database in data buffer areas of a plurality of known radars, and further sorting, identifying and estimating parameters by a main processing unit according to a processing method of the known radar signals; and then, pre-sorting the residual PDW according to the prior knowledge of the known general radar signal characteristics, independently placing a plurality of unknown radar signals PDW in data buffer areas of a plurality of unknown radars, carrying out radiation source detection, identification and parameter estimation by a main processing unit according to a processing method of the unknown radar signals, and immediately rejecting the signals which are determined to be useless. The preprocessing speed is matched with the data stream density of the PDW, and data loss of the PDW stream is avoided as much as possible. The a priori knowledge and a priori information of various known radars used in the preprocessing can be pre-loaded or can be modified in a supplementary way in the signal processing process.
And performing main sorting processing on the radar signals to obtain radiation source characteristic parameters of the radar signals.
The primary sorting process may include: and selecting data in the preprocessing classification buffer, further rejecting data unmatched with radar characteristics according to known priori knowledge and priori information, and then carrying out radar radiation source detection, state identification, threat degree judgment and the like on the data meeting the requirements. The known radar radiation source PDW is processed by performing data correlation sorting on the PDW according to the correlation of a known radar signal sequence PDW, detecting the known radiation source (judging whether the known radiation source exists) on the result after the correlation sorting, and performing statistical estimation on various parameters of the detected radar signal. In general, in the process of performing the main sorting process on the PDW, the data filtered by the main sorting process is supplemented to the corresponding PDW according to the pre-sorting method for the unknown radiation source PDW. The unknown radar radiation source PDW is processed mainly by the steps of checking the conformity degree of actual data in the PDW and the prior knowledge according to the prior knowledge of the characteristics of general radar signals, making hypothesis test and judgment of various radar signal models, calculating the reliability of test and judgment results, performing statistical evaluation of various parameters on detected radar signals reaching certain reliability, and outputting the sorting result of 20 radiation sources to the maximum extent.
Based on the characteristic parameters of the radiation sources, classifying and identifying the radiation sources to obtain the sorting results of the radiation sources; the sorting results include, but are not limited to, model, type, individual identity, threat level, confidence level, etc. of the target radar.
The radar radiation source identification is to compare the radar radiation source signal characteristic parameters obtained by reconnaissance with the known radar model, type and individual characteristic parameters, determine the model, type and individual identity of the radiation source, and further master the application, carrier, threat level and the like of the radiation source. Radar radiation source identification is a conversion process of radiation source parameters into radiation source information, and is a typical pattern identification process. The key elements of radar radiation source identification are: characteristic parameter extraction, radar identification library and classification identification. The characteristics used for radar source identification typically include parameters such as azimuth, frequency, pulse width, pulse repetition interval, intra-pulse modulation characteristics, antenna scanning characteristics, and signal subtleties, among others. The characteristic parameter extraction relies on accurate signal sorting to obtain PDW parameters and intermediate frequency original data of a north radar radiation source, and then the resolving and statistical accumulation of parameters such as types, typical values, value domain distribution ranges and the like of various characteristics are completed through methods such as digital signal processing, statistical signal processing and the like.
In some embodiments, the method further comprises supplementing and/or modifying the known radar database and the radar parameter knowledge base based on the radiation source identification result of the unknown radar signal.
The radar radiation source identification needs to be provided with a perfect and accurate radar identification database, and the accuracy of the identification result greatly depends on the integrity and accuracy of the known radar characteristic parameter information in the radar identification database. And data for completing radar radiation source detection, state identification and threat degree judgment are required to be displayed, recorded and stored. The display and the controller are mainly used for man-machine interface interaction of the information reconnaissance system, and the recorder is used for long-term storage of various processing results.
Fig. 4 is an exemplary block diagram of a system for simulating radar echo and interference according to some embodiments of the present invention. As shown in fig. 4, system 400 includes a signal acquisition measurement module 410, a signal sort identification module 420, a radar echo simulation module 430, an interference signal generation module 440, and a signal transmission module 450.
The signal acquisition and measurement module 410 is configured to receive a signal sent by a target radar to obtain a received signal; and collecting and measuring the received signals to obtain a plurality of pulse description words PDW.
The signal sorting and identifying module 420 is configured to perform sorting processing on each pulse based on the pulse description word PDW, so as to obtain a sorting result.
The radar echo simulation module 430 is configured to simulate an echo signal of the target radar based on the pulse description word PDW, the sorting result, and the echo control parameter.
The interference signal generation module 440 is configured to generate an interference signal of the target radar based on the pulse description word PDW, the sorting result, and the interference control parameter.
The signal transmitting module 450 is used for transmitting an echo signal and/or an interference signal.
In some embodiments, the system 400 further includes a display module, a control module, a log management module, and a database management module.
The display module is at least used for situation display, frequency spectrum data display, pulse parameter analysis display, sorting result display and database interface display.
The control module is used for receiving a control instruction of a user, issuing a control parameter based on the control instruction and receiving PDW data.
And the log management module is used for recording the running condition of the system.
The database management module is at least used for managing a known radar database and a radar parameter knowledge base.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for simulating radar echo and interference is characterized in that: comprises that
Receiving a signal sent by a target radar to obtain a received signal;
collecting and measuring the received signals to obtain a plurality of pulse description words PDW;
based on the pulse description word PDW, sorting each pulse to obtain a sorting result;
simulating an echo signal of the target radar based on the pulse description word PDW, the sorting result and an echo control parameter;
generating an interference signal of the target radar based on the pulse description word PDW, the sorting result and an interference control parameter;
transmitting the echo signal and/or the interference signal;
the obtaining a plurality of pulse description words PDW, including,
carrying out smoothing processing on the baseband signal envelope of a channel to be detected to obtain smooth signals of a plurality of channels;
performing threshold detection on the plurality of smooth signals to obtain a plurality of threshold-crossing envelope signals;
processing the multiple threshold-crossing envelope signals to obtain multiple coarse detection signals;
performing parameter measurement on the plurality of coarse detection signals to obtain a plurality of pulse description words PDW;
said deriving a plurality of coarse detection signals comprises determining a plurality of time slices, for each time slice:
determining the channel with the maximum energy in the time slice based on the over-threshold envelope signal;
determining the width of the signal in the channel with the maximum energy, and when the width of the signal is greater than a threshold value, taking the signal as a coarse detection signal;
zeroing the signal extracted as a coarse detection signal in the threshold-crossing envelope signal;
and repeatedly screening other coarse detection signals in the time slice until a preset number of coarse detection signals are obtained or no threshold signal is generated in the time slice.
2. The method of claim 1, wherein the pulse description word PDW comprises a frequency f of the pulse, and wherein the parameter measurement is performed on the coarse detection signal to obtain the frequency f of the pulse, comprising,
determining real and imaginary parts of the pulses based on a baseband complex signal of the pulses;
calculating the phases of the real part and the imaginary part to obtain the phase of the pulse;
carrying out first-order difference on the phase to obtain the initial frequency of the pulse;
and carrying out value removal processing on the initial frequency to obtain the frequency f of the pulse.
3. The method of claim 2, wherein the de-thresholding, including,
sampling the initial frequency, and determining the phase difference between the n +1 th point and the nth point of adjacent sampling points;
determining whether the phase difference is greater than a threshold value;
if yes, taking the frequency average value of the first 8 points of the n +1 point as the frequency of the n +1 point.
4. The method of claim 1, wherein the sorting of each pulse based on the Pulse Description Word (PDW) to obtain a sorting result comprises,
pre-sorting the pulse description word PDW based on a known radar database, and screening out pulses of known radar signals;
pre-sorting pulse description words PDW of unknown radar signals based on a radar parameter knowledge base, and screening out pulses of unknown radar signals;
performing main sorting processing on radar signals to obtain radiation source characteristic parameters of the radar signals;
based on the characteristic parameters of the radiation sources, classifying and identifying the radiation sources to obtain a sorting result of the radiation sources; the sorting result comprises the model, type, individual identity, threat level and confidence degree of the target radar.
5. The method of simulating radar echoes and interference according to claim 1, wherein the simulating echo signals of the target radar comprises,
receiving echo control parameters;
generating echo working parameters according to the echo control parameters; the echo working parameters comprise the working frequency band and the working time sequence of the echo signal;
according to the pulse description word PDW and the sorting result, performing echo modulation on corresponding pulses to obtain initial echo signals;
processing the initial echo signal to generate an echo signal;
and processing the echo signal based on the echo working parameter, and outputting the processed echo signal.
6. The method of claim 1, wherein the generating of the interfering signal of the target radar comprises,
receiving an interference control parameter;
generating interference working parameters according to the interference control parameters; the interference working parameters comprise working frequency ranges and working time sequences of the interference signals;
according to the pulse description word PDW and the sorting result, carrying out interference modulation on corresponding pulses to obtain an initial interference signal;
processing the initial interference signal to generate an interference signal;
and processing the interference signal based on the interference working parameter, and outputting the processed interference signal.
7. A system for simulating radar echo and interference is characterized by comprising a signal acquisition and measurement module, a signal sorting and identification module, a radar echo simulation module, an interference signal generation module and a signal transmission module;
the signal acquisition and measurement module is used for receiving signals sent by a target radar to obtain received signals; collecting and measuring the received signals to obtain a plurality of pulse description words PDW;
the signal sorting and identifying module is used for sorting each pulse based on the pulse description word PDW to obtain a sorting result;
the radar echo simulation module is used for simulating an echo signal of the target radar based on the pulse description word PDW, the sorting result and an echo control parameter;
the interference signal generation module is used for generating an interference signal of the target radar based on the pulse description word PDW, the sorting result and an interference control parameter;
the signal transmitting module is used for transmitting the echo signal and/or the interference signal;
the obtaining a plurality of pulse description words PDW, including,
carrying out smoothing processing on the baseband signal envelope of the channel to be detected to obtain smooth signals of a plurality of channels;
performing threshold detection on the plurality of smooth signals to obtain a plurality of threshold-crossing envelope signals;
processing the multiple threshold-crossing envelope signals to obtain multiple coarse detection signals;
performing parameter measurement on the plurality of coarse detection signals to obtain a plurality of pulse description words PDW;
said deriving a plurality of coarse detection signals comprises determining a plurality of time slices, for each time slice:
determining the channel with the maximum energy in the time segment based on the over-threshold envelope signal;
determining the width of the signal in the channel with the maximum energy, and when the width of the signal is greater than a threshold value, taking the signal as a coarse detection signal;
zeroing the signal extracted as a coarse detection signal in the threshold-crossing envelope signal;
and repeatedly screening other coarse detection signals in the time slice until a preset number of coarse detection signals are obtained or no threshold signal is generated in the time slice.
8. The system for simulating radar returns and interference according to claim 7, further comprising a display module, a control module, a log management module, and a database management module;
the display module is at least used for situation display, frequency spectrum data display, pulse parameter analysis display, sorting result display and database interface display;
the control module is used for receiving a control instruction of a user, issuing a control parameter based on the control instruction and receiving PDW data;
the log management module is used for recording the running condition of the system;
the database management module is at least used for managing a known radar database and a radar parameter knowledge base.
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| CN115664463B (en) * | 2022-12-28 | 2023-03-14 | 成都安则科技有限公司 | Radio interference signal generation method and radio interference signal generation device |
| CN116106837A (en) * | 2023-04-10 | 2023-05-12 | 成都富元辰科技有限公司 | Unmanned aerial vehicle radar interference simulation system and application |
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