CN114325606B - Multi-system agile radar radio frequency echo signal simulation method - Google Patents
Multi-system agile radar radio frequency echo signal simulation method Download PDFInfo
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Abstract
The invention provides a radar radio frequency echo signal simulation method for multi-system agility, which can realize the simulation of radar echo signals of multi-system by using fewer software and hardware resources and greatly reduce the cost and the volume of a radar echo signal simulation system. In addition, the invention can utilize the interface agile switching of the upper computer to finish the simulation of radar echo signals of various systems in the same continuous echo acquisition test, and has strong flexibility in operation. Meanwhile, the invention adopts the ping-pong operation to realize the radar echo signal generation method, when the FPGA end receives a group of new PRT echo data, the echo data is put on the RAM address where the group of PRT echo data just output is located, so as to update the original PRT echo data in real time, update the parameters such as the starting distance of the PRT, the sampling point number of the data and the like, realize the ping-pong operation, save the FPGA logic resource and improve the time utilization rate.
Description
Technical Field
The invention belongs to the technical field of radar digital signal processing, and particularly relates to a radar radio frequency echo signal simulation method for multi-body agility.
Background
At present, the function and performance test of the software and the hardware of the radar seeker often depend on the external field experiment test, and the external field experiment test has high requirements on test conditions including target targets, field environments and the like, but the actual situation does not often have ideal external field test environments, which is a great challenge for the function and performance test verification of the software and the hardware of the radar seeker.
The radar intermediate frequency echo simulation system can realize target feature simulation of an external field experiment scene by means of software and hardware according to a radar echo waveform design method, and the problem that the function and performance test of the radar seeker software and hardware must depend on the external field experiment test is solved by matching with the microwave combination module to output according with practical application. The current design methods of the more mature radar echo simulation system are roughly divided into the following two types:
1) A purely software radar echo simulation system based on computer development design adopts a computer to generate target echo information, interference information and the like. However, due to the limitation of the computer, the data generation speed is low, and real-time target echo simulation and interference signal simulation cannot be realized.
2) In addition, the design of the radar echo simulation system is realized based on the hardware signal processing board card, and the design method is limited by the memory capacity of the hardware signal processing board card, so that the generated radar echo is few in variety and single in application scene.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a radar radio frequency echo signal simulation method for multi-body agility. The technical problems to be solved by the invention are realized by the following technical scheme:
The invention provides a radar radio frequency echo signal simulation method for multi-body agility, which is applied to a communication server and a radar signal processing board card, wherein the communication server is connected with the radar signal processing board card, and the radar signal processing board card consists of a DSP, an FPGA chip, a radio frequency module, a DA module and a peripheral circuit; the simulation method comprises the following steps:
upper computer software for sending radar related parameters to a radar signal processing board card is established on the communication server;
Wherein, the host computer software includes the software interface, the software interface includes: the radar related parameter editing box comprises input boxes for echo selection X, echo quantization amplitude Amp, the number kk of PRT in one CPI, the number nT p of time-width sampling points in one pulse width Tp, a target distance range R_range, an echo starting distance R, a target speed V r, an echo pulse repetition period PRT, a carrier frequency sequence f m, an echo wave beam pitch angle fai0 and an echo wave beam azimuth angle theta0 parameter; the function buttons comprise an echo data generation button, a TCP service starting button, a data transmission starting button, a reset button and an attenuation enabling button;
The method comprises the steps that an echo mode is switched through an echo mode selection button in a software interface of upper computer software, radar related parameters are generated under different echo modes through an edit box, when an operation instruction for generating an echo data button is received, original echo pulse data are generated according to the radar related parameters, and the radar related parameters and the original echo pulse data form a data frame;
Selecting a button for starting to send data, and sending the data frame to a DSP in a radar signal processing board card;
The DSP determines target information according to radar related parameters of a data frame, continuously constructs a PRT echo pulse signal model based on the target information and original echo pulse data, transmits an Nth PRT echo pulse signal model to the FPGA, and counts the total number of the PRT echo pulse signal models transmitted to the FPGA; calculating the starting distance and the data sampling point number of the N+1PRT echo pulse according to the total number and the radar related parameters, constructing an N+1th PRT echo pulse signal model, and transmitting the N+1th PRT echo pulse signal model to the FPGA when receiving a request transmission instruction transmitted by the FPGA;
Wherein N is a positive integer from 1;
The FPGA stores the Nth PRT echo pulse signal model, and outputs the Nth PRT echo pulse signal model to the DA module according to an echo simulation output instruction generated by the FPGA;
The DA module generates an analog radar intermediate-frequency echo signal according to the Nth PRT echo pulse signal model, and outputs the radar intermediate-frequency echo signal to the radio frequency module;
the radio frequency module converts the radar intermediate frequency echo signals into radar radio frequency echo signals.
Optionally, before the radar-related parameters are generated in different echo modes through the edit box, the radar radio-frequency echo signal simulation method of the multi-system agility further comprises:
And detecting whether the TCP service starting button is started, and if so, establishing a communication link with the TCP protocol of the radar signal processing board card.
Optionally, the DSP determines target information according to radar related parameters of a data frame, continuously constructs a PRT echo pulse signal model based on the target information and original echo pulse data, issues an nth PRT echo pulse signal model to the FPGA, and counts the total number of the PRT echo pulse signal models issued to the FPGA; calculating the starting distance and the number of data sampling points of the N+1PRT echo pulse according to the total number and the radar related parameters, constructing an N+1PRT echo pulse signal model, and when receiving a request sending instruction sent by the FPGA, sending the N+1PRT echo pulse signal model to the FPGA comprises the following steps:
Step a: constructing an echo pulse signal model of a first PRT based on the target information and the original echo pulse data, and sending the echo pulse signal model of the first PRT to an FPGA;
step b: counting the total number of PRT echo pulse signal models issued to the FPGA;
Step c: calculating the starting distance and the data sampling point number of a2 nd PRT echo pulse signal model according to the total number and the radar related parameters;
Step d: constructing a 2 nd PRT echo pulse signal model according to the starting distance and the data sampling point number of the 2 nd PRT echo pulse signal model;
step e: when a request sending instruction sent by the FPGA is received, sending a 2 nd PRT echo pulse signal model to the FPGA;
Step f: calculating the starting distance and the data sampling point number of the (N+2) th PRT echo pulse signal model according to the statistical total number of the (N+1) and the radar related parameters;
Step g: constructing an N+2th PRT echo pulse signal model according to the starting distance and the data sampling point number of the N+2th PRT echo pulse signal model;
step h: and (f) when receiving a request sending instruction sent by the FPGA, sending the (n+2) th PRT echo pulse signal model to the FPGA, and returning to the step (f).
Optionally, an echo mode selection box is used for swiftly switching the system type of the output radio frequency echo signal;
wherein the system type includes: MIMO mode, agile mode, phased array mode.
Optionally, in the frequency agility mode, the carrier frequency sequence f m is randomly generated according to a frequency hopping codeword; determining target information from radar-related parameters of the data frame includes:
The DSP simulates the characteristic of discontinuous phase parameters of echo pulse signals of a frequency agility system caused by frequency agility among pulses according to a carrier frequency sequence f m in radar related parameters in a frequency agility mode;
and taking the characteristic as the characteristic of the target to determine target information.
Optionally, after generating raw echo pulse data from the radar-related parameters,
The upper computer software sets the editing frame of the upper computer software to be in an uneditable state.
Optionally, after the radio frequency module converts the radar intermediate frequency echo signal into the radar radio frequency echo signal, the simulation method of the radar radio frequency echo signal with multiple agility further includes:
The upper computer software detects whether a reset instruction is generated by a reset button, if the reset instruction is detected, the reset instruction is issued to the DSP, and an edit box of the upper computer software is set to be in an editable state;
and the DSP resets and clears the data frame stored by the DSP and the PRT echo pulse signal model.
Optionally, after the radio frequency module converts the radar intermediate frequency echo signal into the radar radio frequency echo signal, the multi-system agile radar radio frequency echo signal simulation method further includes:
the upper computer software sends an attenuation instruction to the FPGA through the DSP when detecting the attenuation instruction generated by the attenuation enabling button;
The FPGA sends an attenuation instruction to the radio frequency module through a serial port;
the radio frequency module is used for adjusting the output power of the radio frequency echo signal.
The invention has the beneficial effects that:
1) The invention provides a radar radio frequency echo signal simulation method for multi-system agility, which can realize the design of a radar echo real-time simulation system of a multi-system by using fewer software and hardware resources and greatly reduce the cost and the volume of the radar echo signal simulation system.
2) The invention can realize the integration of echo signal simulation software of multiple system radars, can utilize the interface of the upper computer to switch rapidly in real time, can finish the simulation of echo signals of multiple system radars in the same continuous echo acquisition test, and has strong flexibility in operation.
3) According to the method, the radar echo signal generation method is realized by adopting ping-pong operation, when the FPGA end receives a group of new PRT echo data, the echo data are put on the RAM address where the group of PRT echo data just output is located, so that the original PRT echo data are updated in real time, parameters such as the starting distance of the PRT and the sampling point number of the data are updated, the ping-pong operation is realized, the FPGA logic resource can be saved, and the time utilization rate is improved.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a flowchart of a radar radio frequency echo signal simulation method for a multi-body agility system provided by an embodiment of the invention;
FIG. 2 is a block diagram of a multi-system agile radar echo real-time simulation system design flow in accordance with the present invention;
FIG. 3 is a diagram of the upper computer operation interface of the radar echo real-time simulation system designed by the invention;
FIG. 4 is a flow state diagram of a real-time signal processing method of the radar echo real-time simulation system of the invention with multiple system agility.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but embodiments of the present invention are not limited thereto.
Aiming at the problems of poor signal processing instantaneity, single application scene and the like of the conventional radar echo simulator system, the invention provides a radar radio frequency echo signal simulation method for multi-body agility, which is mainly applied to real-time simulation of a phased array system/MIMO system/frequency agility system radar radio frequency echo signal. The simulation method is applied to a communication server and a radar signal processing board card, and the communication server is in communication connection with the radar signal processing board card.
As shown in fig. 1, the method for simulating the radar radio-frequency echo signal of the multi-system agility provided by the invention comprises the following steps:
step 1: upper computer software for sending radar related parameters to the radar signal processing board card is established on the communication server;
Wherein, the host computer software includes the software interface, and the software interface includes: the radar-related parameter editing box comprises input boxes for echo mode selection X, echo quantization amplitude Amp, the number kk of PRT in one CPI, the number nT p of time-width sampling points in one pulse width Tp, a target distance range R_range, an echo starting distance R, a target speed V r, an echo pulse repetition period PRT, a carrier frequency sequence f m, an echo beam pitch angle fai0 and an echo beam azimuth angle theta0 parameter; the function buttons comprise an echo data generation button, a TCP service starting button, a data transmission starting button, a reset button and an attenuation enabling button;
Noteworthy are: the upper computer software is operated based on a computer system, an upper computer operation control interface is written based on MATLAB software, relevant parameter editing frames such as radar system selection and the like are designed in the interface, the interface specifically comprises an echo mode selection X, an echo quantization amplitude Amp, the number kk of PRT in one CPI, the number nT p of time-width sampling points in one Tp (pulse width), a target distance range R_range, an echo starting distance R, a target speed V r, an echo pulse repetition period PRT, a carrier frequency sequence f m generated according to a frequency hopping code word, an echo wave beam pitch angle fai0, an echo wave beam azimuth angle theta0 and the like, functional buttons are designed, and comprise an echo data generation button, a TCP service starting button, a data transmission starting button, a reset button and an attenuation enabling button, and an original echo pulse data generation program and a data framing program under each system are developed.
Step 2: the software interface of the upper computer software rapidly switches different echo modes through the echo mode selection button, radar related parameters are generated under the different echo modes through the edit box, when an operation instruction for generating the echo data button is received, original echo pulse data are generated according to the radar related parameters, and the radar related parameters and the original echo pulse data form a data frame;
the echo mode selection frame is used for swiftly switching the system type of the radio frequency echo signals which are simulated and output in the radio frequency echo simulation process;
wherein the system type includes: MIMO mode, agile mode, phased array mode.
It will be appreciated that: the invention can be switched by the echo mode. In the same radar echo simulation process, if the current simulation echo type needs to be switched, radar parameters can be preset in an upper computer, after an echo mode button is clicked to switch a radar system mode, an upper computer can quickly change a radar echo simulation module of the current system, enter the radar echo simulation module of the corresponding system and send the radar echo simulation module to a DSP through an Ethernet, after the DSP receives data, an instruction can be responded quickly, updated echo data is sent to an FPGA in the next pulse repetition period, the switching of the radar waveform type is completed, and the overall time does not exceed one pulse repetition period from the instruction sending to the switching completion.
After the original echo pulse data are generated according to the radar related parameters, the upper computer software sets an editing frame of the upper computer software to be in an uneditable state.
Step 3: selecting a button for starting to send data, and sending the data frame to a DSP in a radar signal processing board card;
Referring to fig. 2, the upper computer sends the frame header, instruction parameters, original echo pulse data and frame tail after framing to the DSP end through ethernet: after the parameter setting is finished, clicking an echo signal sending button on an operation interface of the upper computer, and sending a data frame to a DSP end of the signal processing board card through an Ethernet port by the upper computer, and caching effective data instruction information into the DDR3 chip after the DSP identifies the frame head and the frame tail of the data frame;
step 4: the DSP is used for determining target information according to radar related parameters of the data frame, continuously constructing a PRT echo pulse signal model based on the target information and original echo pulse data, transmitting an Nth PRT echo pulse signal model to the FPGA, and counting the total number of the PRT echo pulse signal models transmitted to the FPGA; calculating the starting distance and the data sampling point number of the N+1PRT echo pulse according to the total number and the radar related parameters, constructing an N+1th PRT echo pulse signal model, and transmitting the N+1th PRT echo pulse signal model to the FPGA when receiving a request transmission instruction transmitted by the FPGA;
Wherein N is a positive integer from 1;
Referring to fig. 2, the dsp analyzes data instruction information issued by the host computer according to the protocol, starts to construct a1 st PRT echo pulse signal model, loads target information, and generates echo pulse data. Calculating the starting distance and the data sampling point number of the starting distance of the PRT echo pulse, transmitting a data packet to the FPGA through an SRIO data link according to a data format protocol, simultaneously counting the number of the transmitted PRTs, starting to generate echo pulse data of the 2 nd PRT, calculating the starting distance and the data sampling point number of the echo pulse of the 2 nd PRT, waiting for the FPGA to transmit a request instruction code B, and requesting the DSP to transmit the echo pulse data of the 1 st PRT;
Step 5: the FPGA stores the Nth PRT echo pulse signal model, and outputs the Nth PRT echo pulse signal model to the DA module according to an echo simulation output instruction generated by the FPGA;
Referring to fig. 2, the fpga receives a data packet that parses the SRIO transmission: the FPGA end latches echo pulse data transmitted by the 1 st DSP, analyzes the initial distance value, the data sampling point value and the echo pulse data of the 1 st PRT, caches the received echo pulse data of the 1 st PRT into a RAM, and the RAM is used for storing the echo pulse data of the 1 st PRT under different systems, the data quantity of the radar of each system is different, and the FPGA needs to switch a data receiving module according to different systems. When echo pulse data for a PRT has been buffered in RAM, a status signal is generated to indicate that a count can be taken from RAM.
Designing a sending number state machine at the FPGA end, and outputting an analog radar echo signal by a DA chip: and after the DA chip is powered on, outputting a non-echo signal with the amplitude value of 0 by default, wherein in a count-up state machine, the default state is 00, after waiting for the 1 st PRT enabling signal to be pulled up in the state, starting timing and jumping to a state 01, and when the state 1 is timing to the initial position value of the target echo, jumping to the state 02 by the count-up state machine. The PRT enable signal is a PRT period signal that controls the entire echo, and PRT is enabled once, representing the echo output that initiates a PRT period once. And (3) starting to read echo pulse data cached by the RAM in the state 02, transmitting the data to the DA chip, and enabling the DA chip to output echo pulse signals until the reading is completed. The state of the number sending state machine jumps to 03; and generating a request instruction code B in the 03 state, sending the request instruction code B to the DSP, requesting the DSP to send echo pulse data of the 2 nd PRT, and simultaneously, skipping to the state 00, waiting for a PRT enabling signal and preparing to output the echo signal of the 2 nd PRT.
The DSP receives a request instruction code B sent by the FPGA, clears the array content of the DDR3 cache, sends a data packet to the FPGA through an SRIO data link according to a data format protocol, counts the number of the sent PRTs, starts to generate echo pulse data of the 3 rd PRT, calculates the starting distance and the number of data sampling points of the echo pulse of the 3 rd PRT, waits for the FPGA to send the request instruction code B, requests the DSP to send the echo pulse data of the 2 nd PRT, and completes real-time intermediate frequency echo pulse signal simulation of the multi-body radar on a signal processing board card according to the real-time signal processing mode described by the invention under the condition of meeting parameter requirements.
Step 6: the DA module generates an analog radar intermediate-frequency echo signal according to the Nth PRT echo pulse signal model, and outputs the radar intermediate-frequency echo signal to the radio frequency module;
step 7: and the radio frequency module is used for converting the radar intermediate frequency echo signals into radar radio frequency echo signals.
Referring to fig. 2, an intermediate frequency echo analog signal generated in real time is input to a radio frequency combining module, and the intermediate frequency signal is up-converted to radio frequency, so that real-time radar radio frequency echo signal simulation is completed. The RF power attenuation value is set in the upper computer operation interface to control the power of the output RF echo in real time.
The invention provides a simulation method of radar radio frequency echo signals of multiple system agility, which comprises the steps of compiling radar echo real-time simulation system upper computer software through combination of software and hardware; issuing a data frame to the DSP; the DSP starts to construct an echo pulse signal model according to the data frame, loads target information and generates echo pulse data; the DSP receives a request instruction code B sent by the FPGA, clears the array content of the DDR3 cache and sends a data packet; the FPGA receives and analyzes the data packet transmitted by the SRIO, designs a sending number state machine and outputs an analog radar echo signal by the DA chip; and inputting the intermediate frequency echo analog signals generated in real time into a microwave radio frequency combination module, and up-converting the intermediate frequency signals to radio frequency to complete real-time radar radio frequency echo signal simulation. Therefore, the simulation method can realize radar radio frequency signal echo simulation with multiple system agility and better real-time performance.
As an optional embodiment of the present invention, before the radar-related parameters are generated in different echo modes by the edit box, the simulation method of the radar radio frequency echo signal with multiple agility further includes:
And detecting whether a TCP service button is started or not, and if so, establishing a communication link with a TCP protocol of the radar signal processing board card.
As an alternative embodiment of the present invention, step 4 includes:
step a: constructing an echo pulse signal model of a first PRT based on target information and original echo pulse data, and sending the echo pulse signal model of the first PRT to an FPGA;
step b: counting the total number of PRT echo pulse signal models issued to the FPGA;
Step c: calculating the starting distance and the data sampling point number of the 2 nd PRT echo pulse signal model according to the total number and the radar related parameters;
Step d: constructing a 2 nd PRT echo pulse signal model according to the starting distance and the data sampling point number of the 2 nd PRT echo pulse signal model;
step e: when a request sending instruction sent by the FPGA is received, sending a 2 nd PRT echo pulse signal model to the FPGA;
Step f: calculating the starting distance and the data sampling point number of the (N+2) th PRT echo pulse signal model according to the statistical total number of the (N+1) and the radar related parameters;
Step g: constructing an N+2th PRT echo pulse signal model according to the starting distance and the data sampling point number of the N+2th PRT echo pulse signal model;
step h: and (f) when receiving a request sending instruction sent by the FPGA, sending the (n+2) th PRT echo pulse signal model to the FPGA, and returning to the step (f).
As an alternative embodiment of the present invention, in the frequency agile mode, the carrier frequency sequence f m is randomly generated according to the frequency hopping code word; determining target information from radar-related parameters of the data frame includes:
in the frequency agility mode, the DSP simulates the characteristic of discontinuous phase parameter of echo pulse signals of a frequency agility system caused by frequency agility among pulses according to a carrier frequency sequence f m in radar related parameters;
the feature is taken as the feature of the target to determine target information.
As an optional implementation manner of the present invention, after the radio frequency module converts the radar intermediate frequency echo signal into the radar radio frequency echo signal, the simulation method of the radar radio frequency echo signal with multiple agility further includes:
The upper computer software detects whether the reset button generates a reset instruction, if the reset instruction is detected, the reset instruction is issued to the DSP, and the edit box of the upper computer software is set into an editable state;
and the DSP resets and clears the data frame and the PRT echo pulse signal model stored by the DSP.
As an optional implementation manner of the present invention, after the rf module converts the radar intermediate frequency echo signal into the radar rf echo signal, the simulation method of the radar rf echo signal with multiple agility further includes:
the upper computer software sends an attenuation instruction to the FPGA through the DSP when detecting the attenuation instruction generated by the attenuation enabling button;
the FPGA sends an attenuation instruction to the radio frequency module through the serial port;
the radio frequency module is used for up-converting the intermediate frequency signal into a radio frequency signal and adjusting the output power of the radio frequency echo signal.
The following describes a specific process of the radar radio frequency echo signal simulation method of the multi-body agility according to the embodiment.
Example 1
The invention relates to upper computer software of a radar echo real-time simulation system, and referring to fig. 3, parameter editing windows such as radar system selection and function buttons are designed in the software, wherein the function buttons comprise an echo data generation button, a TCP service starting button, a data transmission starting button, a reset button and an attenuation enabling button, and an original echo data generation program and a data framing program under various systems are designed, and specifically comprise the following steps:
(1a) And (3) setting a radar system: phased array mode x=1, MIMO mode x=2, and agile mode x=3;
(1b) Setting a target distance range R_range: the calculation formula is determined by the set radar system parameters as follows:
maximum working distance:
Rmax＝Unambi_Range＝PRT*C/2 (1)
minimum working distance:
Rmin＝Tp*C/2 (2)
According to different modes, the maximum acting distance and the minimum acting distance of the radar echo can be calculated, and the range R_range= [ R max Rmin ] of the movable target can be obtained.
(1C) Setting an echo starting distance R: under different systems and parameters, the movable distance range of the target is different and can be set according to specific modes;
(1d) Setting a target speed V r: the target speed may be positive or negative; specifying that the speed is positive indicates that the distance from the target is getting closer and closer, whereas indicates that the distance from the target is getting farther and farther;
(1e) Setting a pulse repetition period PRT: information used for calculating a speed phase item, a PRT starting distance and the like;
(1f) Setting a carrier frequency sequence f m and the number kk of PRTs in one CPI: the carrier frequency requirements of the simulated radar echo are different in different modes, the simulator sets the length of the carrier frequency sequence to 256, and the carrier frequency sequences respectively correspond to 256 PRT carrier frequencies in one CPI. The number kk of PRTs in one CPI, and the corresponding carrier frequency sequence, may be adjusted according to the different modes selected. In phased array mode, setting the number kk of PRT in one CPI as 64, setting the first 64 carrier frequency sequences as a fixed value, and setting the rest as 0; in the MIMO mode, setting the PRT number kk in one CPI as 256 and 256 carrier frequency sequences as a fixed value; in the frequency agility mode, setting the number kk of PRT in one CPI as 64, the first 64 carrier frequency sequences as carrier frequency sequences of random jump, and the rest as 0;
(1g) Setting an echo quantized amplitude Amp
The amplitude of the echo quantization is determined according to the requirements.
(1H) Original echo data in Tp and sampling point number nT p
The calculation formula of the sampling points is as follows:
nTp＝Tp*Fs (3)
the original echo is simulated by a medium-frequency linear frequency modulation wave, and the simulated radar echo data and the sampling point number nT p are different due to the difference of radar parameters in three modes, and the expression of the original medium-frequency echo data in one pulse width in the phased array mode and the agile mode is shown as a formula (4).
Slfm＝(exp(j*pi*u*t.^2).exp(j*2*pi*Fi*t)) (4)
U=b/T p is the frequency modulation slope, F i is the intermediate frequency, and the amplitude of the intermediate frequency signal echo is uniformly specified to be a normalized mode value of 1. The final signal amplitude is determined by the amplitude quantization value Amp.
The MIMO mode needs to design 12 paths of orthogonal intermediate frequency echo waveforms, and obtains original echo data by determining a transmitting and receiving guide vector, constructing a baseband signal, up-converting to intermediate frequency, and performing original echo simulation according to the guide vector. The method for calculating the transmitting and receiving steering vector is shown in the formulas (5), (6) and (7).
az0＝exp(-j*2*pi*d_lambda*[-1.5 -0.5 0.5 1.5]'*sin(θ)) (6)
aa0＝kron(ay0,az0) (7)
D lambda is the ratio of subarray spacing to wavelength,Is pitch angle, θ is azimuth/>And theta are set on the operation interface of the upper computer.
And selecting guide vectors, splicing the guide vectors into vector forms aat, respectively, namely the guide vectors of 12 subarrays of the radar phased array antenna, multiplying the guide vectors of the 12 subarrays with the original orthogonal echo model respectively, and obtaining a synthesized echo wave beam. The 12-path original orthogonal intermediate frequency echo waveform expression is shown in the formula (8).
U=b/T p is the frequency modulation slope, F i is the intermediate frequency, and the amplitude of the intermediate frequency signal echo is uniformly specified to be a normalized mode value of 1. The intermediate frequency interval of two adjacent orthogonal signals is B, and the final signal amplitude is determined by the amplitude quantized value Amp. And splicing the 12 paths of orthogonal intermediate frequency echo signals into a vector form.
And multiplying the 12 paths of orthogonal radar echo waveform data by the steering vector to finally obtain the original signal echo data of the synthesized wave beam of the synthesized MIMO waveform. As shown in formula (9).
Slfm＝(aat).'*Signal (9)
1I) Setting start-to-send data button
After the parameter setting is finished, clicking a button for starting to send data, and framing the parameter data.
1J) Setting reset button
The button can reset all current module states of the radar echo real-time simulation system.
1K) Setting attenuation enable button
And inputting an attenuation instruction value, and clicking an attenuation control button to control the radio frequency output power. The attenuation command value and the actual attenuation value are related as follows, and the default attenuation value is the maximum attenuation.
Example 2
In the same way as in embodiment 1, the DSP of the present invention starts to construct an echo pulse signal model of each PRT according to the data instruction information issued by the protocol parsing host computer, and specifically includes the following steps:
1a) Identifying radar system mode instructions issued by an upper computer, entering different echo construction modules according to different modes, taking out all instructions from DDR3 and taking out original echo data from DDR3 according to sampling points;
1b) Loading echo information
And loading target information into the target echo original data, wherein the loading modes of the echo target information in different modes are slightly different.
Phased array mode
The PRT is pulse repetition period issued by the upper computer, V r is target speed, kk represents the number of PRTs, the number of PRTs in one CPI is 64, target information is modulated in pulse width of each PRT according to the issued carrier frequency sequence with fixed carrier frequency value, the initial distance of each PRT is calculated according to the issued target echo initial distance, and after the echo data of one PRT are calculated, the result and the initial distance corresponding to the PRT are sent to the RAM end of the FPGA. The starting distance formula for calculating the echo is as follows:
start_pos＝fix((R-(kk-1)*Vr*PRT)/(C/(2*Fs))/2) (11)
Where kk represents the kk-th PRT, and the light velocity c=3×10 8m/s,Fs is the sampling frequency.
MIMO mode
The PRT is pulse repetition period issued by the upper computer, V r is target speed, kk represents the number of PRTs, the number of PRTs in one CPI is 256, target information is modulated in pulse width of each PRT according to the issued carrier frequency sequence with fixed carrier frequency value, the initial distance of each PRT is calculated according to the issued target echo initial distance, and after echo data of one PRT are calculated, the result and the initial distance corresponding to the PRT are sent to the RAM end of the FPGA. The starting distance formula for calculating the echo is as follows:
start_pos＝fix((R-(k-1)*Vr*PRT)/(C/(2*Fs))/2) (13)
Where kk represents the kk-th PRT, and the light velocity c=3×10 8m/s,Fs is the sampling frequency.
Agile frequency mode
The PRT is pulse repetition period issued by an upper computer, V r is target speed, kk represents the number of PRTs, the number of the PRTs in one CPI is 64, target information is modulated in pulse width of each PRT according to issued carrier frequency sequence of random jump, the initial distance of each PRT is calculated according to issued target echo initial distance, and after echo data of one PRT are calculated, a result and the initial distance corresponding to the PRT are sent to the RAM end of the FPGA. The starting distance formula for calculating the echo is as follows:
start_pos＝fix((R-(k-1)*Vr*PRT)/(C/(2*Fs))/2) (15)
Where kk represents the kk-th PRT, and the light velocity c=3×10 8m/s,Fs is the sampling frequency.
1C) And framing the data according to a data packet protocol of a frame head, a starting distance of echo pulses, a data sampling point number, echo pulse data of loading target information and a frame tail, and waiting for the FPGA to send a data request instruction.
Example 3
Referring to fig. 4, as in example 1,
1A) The FPGA sends a data request instruction code B to the DSP and receives and analyzes a data packet transmitted by the SRIO: the FPGA end latches the data transmitted by the 1 st DSP, analyzes the starting distance start_point, the data sampling point memory_depth and the echo pulse data of the 1 st PRT, and caches the received 1 st PRT echo pulse data into a RAM, wherein the RAM is used for storing the echo pulse data of the 1 st PRT under different systems, the data quantity of the radar of each system is different, and the FPGA needs to switch the data receiving module according to the different systems. Generating a status signal to indicate that the data can be fetched from the RAM when echo data of a PRT has been buffered in the RAM;
1b) Designing a sending number state machine at the FPGA end, and outputting an analog radar echo signal by a DA chip: in the number-of-transmission state machine, the default state is 00, after the PRT enabling signal is pulled high for the 1 st time in the default state, the DA chip starts enabling, the amplitude of the non-pulse signal starts to be output to be 0, the cnt_1 starts to count and jumps to the state 01, and the cnt_1 counter counts to the initial position value of the target echo in the state 01. The PRT enabling signal is a PRT periodic signal for controlling the whole echo, PRT is enabled once, and represents the echo output of starting one PRT period;
1c) When the cnt_1 count value reaches the initial position value, the counting state machine jumps to state 02, at this time, the reading of the echo pulse data in the RAM is started, and addrb starts to sequentially add 1 until the number of echo pulse data sampling points of the PRT is reached. Meanwhile, the DA chip starts to output an analog radar echo pulse signal;
1d) When the B port addrb of the RAM counts to memory_depth-1, the DA chip finishes the echo data of the PRT, and the state of the counting state machine jumps to 03; pulling srio _cmd_tx up by 10 200MHz clock cycles in the 03 state, generating srio _cmd_tx_pos pulses, sending a request instruction code B to the DSP, requesting the DSP to send data of the 2 nd PRT, simultaneously, skipping the state to the state 00, waiting for a PRT enabling signal, and preparing to output an echo signal of the 2 nd PRT;
1e) The DSP receives a request instruction code B sent by the FPGA, clears the array content of the DDR3 cache, sends a data packet to the FPGA through an SRIO data link according to a data format protocol, counts the number of the sent PRTs, starts to generate echo data of the 3 rd PRT, calculates the starting distance and the number of data sampling points of the 3 rd PRT, waits for the FPGA to send the request instruction code B, requests the DSP to send the echo data of the 3 rd PRT, and completes real-time radio frequency echo signal simulation of the multi-body radar on a signal processing board card according to the real-time signal processing mode described by the invention under the condition of meeting parameter requirements.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (8)
1. The radar radio frequency echo signal simulation method for the multi-body agility is applied to a communication server and a radar signal processing board card, wherein the communication server is connected with the radar signal processing board card; the simulation method comprises the following steps:
upper computer software for sending radar related parameters to a radar signal processing board card is established on the communication server;
Wherein, the host computer software includes the software interface, the software interface includes: the radar related parameter editing box comprises input boxes for echo selection X, echo quantization amplitude Amp, the number kk of PRT in one CPI, the number nT p of time-width sampling points in one pulse width Tp, a target distance range R_range, an echo starting distance R, a target speed V r, an echo pulse repetition period PRT, a carrier frequency sequence f m, an echo wave beam pitch angle fai0 and an echo wave beam azimuth angle theta0 parameter; the function buttons comprise an echo data generation button, a TCP service starting button, a data transmission starting button, a reset button and an attenuation enabling button;
The method comprises the steps that an echo mode is switched through an echo mode selection button in a software interface of upper computer software, radar related parameters are generated under different echo modes through an edit box, when an operation instruction for generating an echo data button is received, original echo pulse data are generated according to the radar related parameters, and the radar related parameters and the original echo pulse data form a data frame;
Selecting a button for starting to send data, and sending the data frame to a DSP in a radar signal processing board card;
The DSP determines target information according to radar related parameters of a data frame, continuously constructs a PRT echo pulse signal model based on the target information and original echo pulse data, transmits an Nth PRT echo pulse signal model to the FPGA, and counts the total number of the PRT echo pulse signal models transmitted to the FPGA; calculating the starting distance and the data sampling point number of the N+1PRT echo pulse according to the total number and the radar related parameters, constructing an N+1th PRT echo pulse signal model, and transmitting the N+1th PRT echo pulse signal model to the FPGA when receiving a request transmission instruction transmitted by the FPGA;
Wherein N is a positive integer from 1;
The FPGA stores the Nth PRT echo pulse signal model, and outputs the Nth PRT echo pulse signal model to the DA module according to an echo simulation output instruction generated by the FPGA;
The DA module generates an analog radar intermediate-frequency echo signal according to the Nth PRT echo pulse signal model, and outputs the radar intermediate-frequency echo signal to the radio frequency module;
the radio frequency module converts the radar intermediate frequency echo signals into radar radio frequency echo signals.
2. The multi-system agile radar radio frequency echo signal simulation method according to claim 1, wherein the multi-system agile radar radio frequency echo signal simulation method further comprises, before passing through the edit box in different echo modes to generate radar-related parameters:
And detecting whether the TCP service starting button is started, and if so, establishing a communication link with the TCP protocol of the radar signal processing board card.
3. The method for simulating the radar radio frequency echo signals of the multiple system agility according to claim 1, wherein the DSP determines target information according to radar related parameters of a data frame, continuously constructs a PRT echo pulse signal model based on the target information and original echo pulse data, transmits an Nth PRT echo pulse signal model to the FPGA, and counts the total number of the PRT echo pulse signal models transmitted to the FPGA; calculating the starting distance and the number of data sampling points of the N+1PRT echo pulse according to the total number and the radar related parameters, constructing an N+1PRT echo pulse signal model, and when receiving a request sending instruction sent by the FPGA, sending the N+1PRT echo pulse signal model to the FPGA comprises the following steps:
Step a: constructing an echo pulse signal model of a first PRT based on the target information and the original echo pulse data, and sending the echo pulse signal model of the first PRT to an FPGA;
step b: counting the total number of PRT echo pulse signal models issued to the FPGA;
Step c: calculating the starting distance and the data sampling point number of a2 nd PRT echo pulse signal model according to the total number and the radar related parameters;
Step d: constructing a 2 nd PRT echo pulse signal model according to the starting distance and the data sampling point number of the 2 nd PRT echo pulse signal model;
step e: when a request sending instruction sent by the FPGA is received, sending a 2 nd PRT echo pulse signal model to the FPGA;
Step f: calculating the starting distance and the data sampling point number of the (N+2) th PRT echo pulse signal model according to the statistical total number of the (N+1) and the radar related parameters;
Step g: constructing an N+2th PRT echo pulse signal model according to the starting distance and the data sampling point number of the N+2th PRT echo pulse signal model;
step h: and (f) when receiving a request sending instruction sent by the FPGA, sending the (n+2) th PRT echo pulse signal model to the FPGA, and returning to the step (f).
4. The method for simulating a multi-body agile radar radio frequency echo signal according to claim 3, wherein the echo mode selection box is used for agile switching of the system type of the output radio frequency echo signal;
wherein the system type includes: MIMO mode, agile mode, phased array mode.
5. The method for simulating a multi-system agile radar radio frequency echo signal according to claim 4, wherein in the agile mode, the carrier frequency sequence f m is randomly generated according to a frequency hopping codeword; determining target information from radar-related parameters of the data frame includes:
The DSP simulates the characteristic of discontinuous phase parameters of echo pulse signals of a frequency agility system caused by frequency agility among pulses according to a carrier frequency sequence f m in radar related parameters in a frequency agility mode;
and taking the characteristic as the characteristic of the target to determine target information.
6. The method for multiple system agile radar radio frequency echo signal simulation according to claim 1, wherein after generating raw echo pulse data from the radar related parameters,
The upper computer software sets the editing frame of the upper computer software to be in an uneditable state.
7. The method for simulating a multi-system agile radar radio frequency echo signal according to claim 1, wherein after the radio frequency module converts the radar intermediate frequency echo signal to a radar radio frequency echo signal, the method for simulating a multi-system agile radar radio frequency echo signal further comprises:
The upper computer software detects whether a reset instruction is generated by a reset button, if the reset instruction is detected, the reset instruction is issued to the DSP, and an edit box of the upper computer software is set to be in an editable state;
and the DSP resets and clears the data frame stored by the DSP and the PRT echo pulse signal model.
8. The multi-system agile radar radio frequency echo signal simulation method according to claim 1, wherein after the radio frequency module converts the radar intermediate frequency echo signal into a radar radio frequency echo signal, the multi-system agile radar radio frequency echo signal simulation method further comprises:
the upper computer software sends an attenuation instruction to the FPGA through the DSP when detecting the attenuation instruction generated by the attenuation enabling button;
The FPGA sends an attenuation instruction to the radio frequency module through a serial port;
the radio frequency module is used for adjusting the output power of the radio frequency echo signal.
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-
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Non-Patent Citations (2)
| Title |
|---|
| "Design and Implementation of Multi Mode Radar Target Simulator using Direct Digital Synthesizer";Usman Shahid 等;《Proceedings of International Bhurban Conference on Applied Sciences & Technology》;20091231;155-158 * |
| "基于PRI捷变的雷达通信一体化共享信号设计方法";刘智星 等;《系统工程与电子技术》;20210630;2836-2842 * |
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