CN109375175A - A kind of radar signal that supporting more waveforms and receive system and method - Google Patents
A kind of radar signal that supporting more waveforms and receive system and method Download PDFInfo
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- CN109375175A CN109375175A CN201811232931.9A CN201811232931A CN109375175A CN 109375175 A CN109375175 A CN 109375175A CN 201811232931 A CN201811232931 A CN 201811232931A CN 109375175 A CN109375175 A CN 109375175A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of radar signal for supporting more waveforms and receive system and method, wherein the system includes: FPGA module, DSP module composition；Wherein, FPGA module includes waveform sending module, echo reception module and chip configuration module.The present invention has the characteristics that control is flexible, scalability is strong, fitness is high, using the switching at runtime between waveform, improves system rejection to disturbance, meets the requirement that moving-target is quickly tracked, identified.
Description
Technical field
The invention belongs to radar signals and reception technique field more particularly to a kind of radar signal for supporting more waveforms
Transmitting and reception system and method.
Background technique
Radar is the useful information for detecting target by the feature of receives echo-signal, and extracting target, such as distance, angle
Degree, movement velocity, target shape and property etc..With the development of digital technology, make radar system towards digitlization, software implementation,
Modular direction rapidly develops, and application range is also increasingly wider.
The main task of radar waveform design is to select suitable signal to given target environment condition according to operational requirements,
Setting signal type and relevant parameter, thus radar waveform optimization design algorithm research become it is mostly important in radar application
One ring.
Linear FM signal has good autocorrelation performance, when designer can freely select the pulse of LFM signal
Wide and modulating bandwidth, Waveform Design are versatile and flexible.Influence due to its Doppler frequency shift to pulse compression process is smaller, so
The shortcomings that being used widely in radar, but being coupled there is also distance with Doppler.Especially under intentional disturbed condition, due to
Waveform is simple, is easy to be reconditioned and forward.NLFM signal autocorrelation performance is good, and distance and Doppler's coupling is not present
It closes, available accurate distance and velocity measurement, but sensitive to Doppler frequency, it is smaller to be suitable for Doppler's variation range
Occasion.But it since complexity is realized in design, is not used widely.
Phase-coded signal is a kind of pulse compression signal encoded by the phase to signal, according to phase value
The difference of number can be divided into biphase coding and polyphase codes.Orthogonal phase coded signal is generallyd use based on genetic algorithm, benefit
One group of two-phase or multinomial coded sequence with good auto-correlation and cross correlation are designed with intersecting, making a variation.With number of phases
Increase, it is also increasing to the sensibility of Doppler frequency.It, can not be real by DDS method and due to the complexity of algorithm
It is existing, specific waveforms can only be pre-generated by software approach.
Currently, single waveform can no longer meet the requirement of complex environment radar system, it is based particularly on the deception of DRFM
Interference.
With the development of counting machine technology, signal processing technology, microelectric technique, the application of electronic technology has been penetrated into
The every field such as military, civilian.It all will be using AD or D/A converter to improve in modern advanced electronic system front-end and back-end
The performance of digital processing technology.
Low speed, simple function AD, DA chip can only meet specific requirement, it is instantaneous greatly not to be able to satisfy modern radar system
Bandwidth, live signal reception, Larger Dynamic range, high sensitivity and frequency discrimination requirement, low side AD, DA chip can no longer meet
The requirement of modern radar digital display circuit.
Summary of the invention
Technical problem solved by the present invention is having overcome the deficiencies of the prior art and provide a kind of radar for supporting more waveforms
Signal transmitting and reception system and method, have the characteristics that control is flexible, scalability is strong, fitness is high, using between waveform
Switching at runtime improves system rejection to disturbance, meets the requirement that moving-target is quickly tracked, identified.
The object of the invention is achieved by the following technical programs: according to an aspect of the invention, there is provided a kind of
Hold the radar signal and reception system of more waveforms, comprising: FPGA module, DSP module composition；Wherein, FPGA module includes
Waveform sending module, echo reception module and chip configuration module；Wherein, the waveform sending module acquisition is externally input
CPI signal and PRF signal, and carry out edge detection to CPI signal and PRF signal and obtain waveform transmitting pulse signal；DSP mould
Block sends instructions to the waveform sending module, and the waveform sending module is according to instruction output waveform mark and according to waveform mark
Know, obtains corresponding parameter；When waveform transmitting pulse signal is effective, Multichannel Waveform data are generated；By Multichannel Waveform data into
DA chip is sent after row synthesis；The reception signal control module acquires externally input CPI signal and PRF signal, and to CPI
Signal and PRF signal carry out edge detection and obtain receiving echo pulse signal；When waveform reception echo pulse signal is effective,
4 railway digital signals after A/D chip conversion are acquired, the digital signal after output acquisition；Number letter after receiving acquisition
Number, and carry out centainly handle after obtain it is down-sampled after baseband signal；According to the baseband signal after down-sampled, channel is carried out respectively
Calibration and after difference is poor, Doppler effect correction is handled, obtains 3 road signals；3 road arteries and veins are obtained after 3 road signals are carried out signal processing respectively
Press data；DSP module is sent to after 3 tunnel pulse pressure data are carried out framing；Chip configuration module is to A/D chip, DA chip and multi-pass
Road clock chip is configured.
In the radar signal and reception system of the above-mentioned more waveforms of support, the waveform sending module includes signal control
Module, command analysis module, parameter selecting module, DDS module, waveform loading module and waveform sending module；Wherein, signal control
Molding block acquires externally input CPI signal and PRF signal, and carries out edge detection to CPI signal and PRF signal and obtain wave
Shape emits pulse signal；DSP module sends instructions to command analysis module, and command analysis module is according to instruction output waveform mark
Know；The parameter selecting module is identified according to waveform, obtains corresponding parameter, and corresponding parameter is sent to DDS module；When
When waveform transmitting pulse signal is effective, starting DDS module generates Multichannel Waveform data；The waveform loading module is from external storage
Device reads wave file and caches, and when waveform transmitting pulse signal is effective, selects corresponding address to generate according to waveform mark
Multichannel Waveform data；Waveform sending module receives the Multichannel Waveform data that DDS module or waveform loading module generate, and is synthesized
DA chip is sent afterwards.
In the radar signal and reception system of the above-mentioned more waveforms of support, the echo reception module includes receiving signal
Control module, echo wave signal acquisition module, baseband signal processing module, signal pre-processing module, process of pulse-compression module and
Data framing sending module；Wherein, it receives signal control module and acquires externally input CPI signal and PRF signal, and to CPI
Signal and PRF signal carry out edge detection and obtain receiving echo pulse signal；When waveform reception echo pulse signal is effective,
Start echo wave signal acquisition module；Echo wave signal acquisition module using JESD204B interface it is synchronous with A/D chip foundation after, to AD
4 railway digital signals after chip conversion are acquired, the digital signal after output acquisition；Baseband signal processing module receives acquisition
Digital signal afterwards, and carry out centainly handle after obtain it is down-sampled after baseband signal；Signal pre-processing module receives down-sampled
Baseband signal afterwards carries out channel calibration respectively and after difference is poor, Doppler effect correction is handled, obtains 3 road signals；At pulse compression
It manages module and receives 3 road signals, after carrying out signal processing respectively, obtain 3 tunnel pulse pressure data；Data framing sending module receives 3 tunnels
Pulse pressure data are sent to DSP module after carrying out framing.
In the radar signal and reception system of the above-mentioned more waveforms of support, in the parameter selecting module according to waveform mark
Know, obtain in corresponding parameter, the parameter is phase increment and stepping.
In the radar signal and reception system of the above-mentioned more waveforms of support, waveform emits the effective criterion of pulse signal
Are as follows: as launch time > 7ns of waveform transmitting pulse signal, it is effective that waveform emits pulse signal.
In the radar signal and reception system of the above-mentioned more waveforms of support, waveform receives echo pulse signal and effectively sentences
According to are as follows: when waveform receives launch time > 10ns of echo pulse signal, it is effective that waveform receives echo pulse signal.
In the radar signal and reception system of the above-mentioned more waveforms of support, after baseband signal processing module receives acquisition
Digital signal, and complete up-conversion, filtering and extraction processing, obtain it is down-sampled after baseband signal.
In the radar signal and reception system of the above-mentioned more waveforms of support, process of pulse-compression module receives 3 road signals,
After carrying out FFT, matched filtering, IFFT processing respectively, 3 tunnel pulse pressure data are obtained.
In the radar signal and reception system of the above-mentioned more waveforms of support, data framing sending module receives 3 tunnel pulse pressures
Data by SRIO interface are sent to DSP module after carrying out framing.
According to another aspect of the present invention, a kind of radar signal for supporting more waveforms and method of reseptance are additionally provided,
Described method includes following steps: waveform sending module acquires externally input CPI signal and PRF signal, and to CPI signal and
PRF signal carries out edge detection and obtains waveform transmitting pulse signal；DSP module sends instructions to waveform sending module, waveform
Sending module is according to instruction output waveform mark；Parameter selecting module is identified according to waveform, obtains corresponding parameter；When waveform is sent out
Penetrate pulse signal it is effective when, generate Multichannel Waveform data；DA chip is sent after Multichannel Waveform data are synthesized；Receive signal
Control module acquires externally input CPI signal and PRF signal, and carries out edge detection to CPI signal and PRF signal and obtain
Receive echo pulse signal；When waveform reception echo pulse signal is effective, 4 railway digital signals after A/D chip conversion are carried out
Acquisition, the digital signal after output acquisition；Receive acquisition after digital signal, and carry out centainly handle after obtain it is down-sampled after
Baseband signal；According to the baseband signal after down-sampled, channel calibration is carried out respectively and after difference is poor, Doppler effect correction is handled, is obtained
3 road signals；3 tunnel pulse pressure data are obtained after 3 road signals are carried out signal processing respectively；It is sent out after 3 tunnel pulse pressure data are carried out framing
Give DSP module.
Compared with prior art, the present invention has the following advantages:
(1) system realizes the broadband for supporting multiple waveforms, the transmission of if radar signal using high speed D/A chip.Waveform
The method that sending module uses parameter transmitting, is assigned to corresponding variable for precalculated waveform parameter, utilizes multichannel DDS
The method of module reuse realizes the transmitting of pulse width, a variety of linear FM signals of adaptive-bandwidth.It is special in order to meet
It is required that completing the storage and update of a variety of predetermined waveforms, matching factor using peripheral storage method is based on；Especially intentional
The case where interference, the combination that can use multiple waveforms are sent or are carried out using PRF as the period switching of multiple waveforms, improve
The anti-interference ability of system.Finally, realizing Wideband Radar Signal Waveform under low sampling rate using Multichannel Waveform synthetic method
Transmitting, improves the reliability of design.
(2) the synchronous SYSREF ± signal in 3 tunnels that the system is generated using clock chip, realizes FPGA and 2 A/D chip
It is synchronous；In order to meet the requirement of coherent accumulation, and with send synchronous waveform, receiving control signaling module is equally week with CPI
Phase, and start receives echo-signal in the failing edge of PRF signal；Baseband signal in order to obtain, using up-conversion and filtering
Method eliminates carrier component.Simultaneously in order to eliminate range error caused by the amplitude phase error and Doppler that multichannel introduces, use
Channel calibration and the signal processing methods such as difference difference and Doppler effect correction.During process of pulse-compression, in order to guarantee at one
Pulse pressure data are obtained in PRF, are realized that FFT and IFFT is converted using high sampling rate, are reduced processing delay；And use reset side
Method eliminates section FFT, IFFT transformation causes Doppler effect
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the radar signal provided in an embodiment of the present invention for supporting more waveforms and the structural block diagram for receiving system；
Fig. 2 is that waveform sending module provided in an embodiment of the present invention sends linear FM signal process flow diagram；
Fig. 3 is that waveform sending module provided in an embodiment of the present invention is based on Waveform storage method process flow diagram；
Fig. 4 is echo reception module echo data acquisition provided in an embodiment of the present invention and base band signal process control flow
Figure；
Fig. 5 is echo reception module by signal pretreatment process figure provided in an embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and
Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is the radar signal provided in an embodiment of the present invention for supporting more waveforms and the structural block diagram for receiving system.
As shown in Figure 1, the system includes FPGA module, DSP module composition.Wherein FPGA module includes: that waveform sending module, echo connect
Receive module, chip configuration module.
The waveform sending module includes signal control module, command analysis module, parameter selecting module, DDS module, wave
Shape loading module and waveform sending module；Wherein, signal control module acquires externally input CPI signal and PRF signal, and right
CPI signal and PRF signal carry out edge detection and obtain waveform transmitting pulse signal；DSP module sends instructions to instruction parsing
Module, command analysis module are identified according to instruction output waveform；For linear FM signal, parameter selecting module is according to waveform mark
Know, obtains corresponding parameter (phase increment, stepping), and corresponding parameter is sent to DDS module；When waveform transmitting pulse letter
Number effectively when (high impulse, > 100ns), starting DDS module generate Multichannel Waveform data；For special waveform signal, the waveform
Loading module reads wave file from external memory and caches, and when waveform transmitting pulse signal is effective, is identified according to waveform
Corresponding address is selected to generate Multichannel Waveform；Waveform sending module receives the multichannel wave that DDS module or waveform loading module generate
Graphic data sends DA chip after being synthesized.
The echo reception module includes receiving signal control module, echo wave signal acquisition module, base band signal process mould
Block, signal pre-processing module, process of pulse-compression module, data framing sending module.
Wherein, it receives signal control module and acquires externally input CPI signal and PRF signal, and to CPI signal and PRF
Signal carries out edge detection and obtains receiving echo pulse signal；When waveform reception echo pulse signal is effective (high impulse, >
100ns), start echo wave signal acquisition module；Echo wave signal acquisition module is synchronous with A/D chip foundation using JESD204B interface
Afterwards, 4 railway digital signals after A/D chip conversion are acquired, the digital signal after output acquisition；Baseband signal processing module
Receive acquisition after digital signal, and complete up-conversion, filtering and extraction processing, obtain it is down-sampled after baseband signal；Signal
Preprocessing module receive it is down-sampled after baseband signal, carry out channel calibration respectively and after difference is poor, Doppler effect correction is handled, obtain
To 3 road signals；Process of pulse-compression module receives 3 road signals, after carrying out FFT, matched filtering, IFFT processing respectively, obtains 3 tunnels
Pulse pressure data；Data framing sending module receives 3 tunnel pulse pressure data, by SRIO interface is sent to DSP module after carrying out framing.
Before echo wave signal acquisition module acquires 4 railway digital signals, using the SYSREF of Multi-path synchronous ± as reference signal,
It is synchronous between realization FPGA module and A/D chip using JESD204B module, it synchronizes rear A/D chip and mould is completed to echo-signal
Number conversion.
Chip configuration module configures A/D chip, DA chip and multichannel clock chip.
(1) after system power-on reset, chip configuration module completes the configuration to peripheral chip, to meet in 720MHz
Frequency radar signal and the requirement for receiving system.Wherein FPGA matches the realizations such as AD, DA, clock chip as main control chip
It sets, system starts after the completion of configuration.Clock chip gives waveform sending module, echo reception module to provide required work respectively
Make clock.
Specifically, chip configuration module completes configuration and control to chip.Peripheral chip includes AD, DA, clock chip etc..
After the PLL locking of clock chip interior, AD, DA chip could be given to provide reliable work clock.In order to meet if radar
The transmitting of signal and the reception of echo-signal using high-speed, high performance AD, DA chip, and pass through change configurator
Meet the radar signal of different bandwidth and receive and requires.
(2) waveform sending module supports the transmitting of a variety of linear FM signals.Parameter selecting module utilizes parameter transmitting
Method identifies according to the waveform of command analysis module output, precalculated waveform parameter is assigned to DDS module；Work as letter
The pulse signal of number control module output starts DDS module when effective, the DDS mould when Counter Value is equal to the pulse width of setting
Block stops working.When needing to convert waveform, according to the instruction that DSP module is sent, parameter selecting module selects corresponding parameter
To change the Wave data of DDS module output, the switching at runtime of linear frequency modulated waveform is realized.
The waveform parameter precalculated is assigned to specifically, powering on rear parameter selecting module and generating the waveform mark defaulted
Corresponding variable, and pass to DDS module.Meanwhile signal control module carries out resampling to CPI and PRF signal and edge mentions
It takes, using CPI signal as the period, and starts DDS module in the rising edge of each PRF signal.It is set when waveform sends to count to reach
When definite value, stop sending waveform, i.e. transmission default value 0.When needing switching waveform, in the way of parameter transmitting, according to wave
Shape mark changes corresponding variable, realizes pulse width, the transmitting of a variety of linear FM signals of adaptive-bandwidth.
(3) waveform sending module also supports the transmitting with other waveforms of different characteristic, is realized using peripheral storage special
The storage and transmitting of standing wave shape.The method that address selection module is transmitted also with parameter, according to command analysis module output
Waveform mark, selects corresponding address space, to change the Wave data of transmitting, meets special requirement.
Specifically, in order to emit special waveform, FPGA will be deposited after powering on every time first predetermined waveform storage into Flash
The Wave data and matching factor stored up in Flash is stored into DDR2, equally using CPI as sending cycle, and each PRF's
Rising edge starts to read the waveform prestored in the address DDR2, reads waveform after fixed delay.When needing switching waveform, only
The address space for changing DDR2 need to be identified according to waveform, can be achieved with the switching at runtime of specific waveforms.
(4) waveform sending module utilizes Multichannel Waveform synthetic method, and if radar signal is realized under low sampling rate
Transmitting.The Multichannel Waveform data that waveform sending module exports DDS module are timely using OSERDES2 module 2 road waveforms of synthesis
Clock is sent to DA chip.
Specifically, waveform sending module utilizes Multichannel Waveform synthetic method, meets high speed D/A using low sampling rate and sample
It is required that.Waveform sending module generates Multichannel Waveform data using DDS module multiplexing method, synthesizes 2 road waveforms using OSERDES2
And 1 road clock be sent to DA chip, meet the launch requirements of Wideband Intermediate Frequency radar signal.
(5) echo reception module utilizes system reference signal (SYSREF ±), to complete multicore before receiving echo data
Synchronization between piece.Echo wave signal acquisition module utilizes SYSREQ signal, makes 3 road SYSREF ± difference of clock chip synchronism output
To 2 A/D chips and fpga chip；A/D chip is as JESD204B sender, after receiving SYNC triggering, FPGA conduct
It is synchronous that JESD204B recipient by JESD204B module is respectively completed code-group synchronization (CGS), initial channel with A/D chip
(ILAS) after, i.e. between FPGA and AD after link synchronization, AD starts to send data.
Specifically, realizing that FPGA is synchronous with 2 A/D chips before acquisition echo-signal.Echo wave signal acquisition module will generate
SYSREF request signal is sent to clock chip, clock chip generate simultaneously 3 road SYSREF ± send respectively, 2 A/D chips and
FPGA；Echo reception module receives data using JESD204B module, continuously receives SYNC after 4 or more 0xBCBCBCBC
Signal is set to high level, and A/D chip is sent to after differential conversion and is sequentially completed code-group after A/D chip receives the signal
After synchronous (CGS), initial channel synchronous (ILAS), analog-to-digital conversion is completed to input signal.
(6) echo reception module completes the acquisition of 4 railway digital signals.In order to realize coherent accumulation, receives signal and control mould
Block is acquired CPI and PRF signal, using CPI signal as the period, and in the failing edge of PRF signal as echo acquirement mould
The reception echo pulse signal of block starts echo wave signal acquisition module；When delay count value is equal to sample strobe length of delay, open
Begin orthogonal (IQ) data in 4 tunnels of acquisition.
Specifically, in order to synchronous with waveform sending module, and meet the requirement of correlative accumulation, receive signal control module
Also resampling is carried out to CPI and PRF signal and edge is handled.I.e. using CPI as the period, and opened in the failing edge of PRF signal
Dynamic delay counter starts to acquire orthogonal (IQ) data when count value is equal to sample strobe length of delay.
(7) echo reception module is handled to obtain baseband signal to 4 road orthogonal datas of acquisition.Base band is believed in order to obtain
Number, baseband processing module carries out two-way synthesis to orthogonal data respectively, then carries out up-conversion and be filtered to obtain baseband signal；
In order to reduce processing speed, baseband signal is carried out 4 and takes out 1 processing, is completed down-sampled.
Specifically, baseband processing module is first acquired 2 road I, the Q data of every road echo data, 2 times of clocks are utilized
After synthesis, after carrying out up-conversion, filtering processing, baseband signal is obtained after carrying out 4 pumping, 1 processing.
(8) echo reception module pre-processes baseband signal.In order to eliminate phase difference and the Doppler between channel
Caused range ambiguity, preprocessing module carry out channel correcting to baseband signal, wherein calibration factor is deposited with before poor processing
It stores up in the memory of periphery, calibration factor can according to need carry out real-time update, have non-volatile.With poor processing
Afterwards, orthogonal waveforms are generated using DDS module, carries out Doppler effect correction processing to poor difference signal.Wherein, Doppler effect correction with
CPI is the period.
Specifically, needing to carry out to baseband signal to eliminate the influence of channel difference and Doppler to coherent result
Pretreatment.Preprocessing module carries out channel correcting and the signal processings such as difference difference and Doppler effect correction to base band data respectively.Its
In, channel correcting coefficient is stored in Flash, can be needed to carry out real-time update according to system, be read after powering on every time.It is more
Pu Le compensation, which uses, is based on DDS mode, and using CPI as the period, i.e., each CPI updates a Doppler effect correction value, according to benefit
Repay value generate orthogonal waveforms, be multiplied with poor difference data after complete Doppler effect correction.
(9) echo reception module carries out pulse compression to poor difference signal.After pulse compression module is to Doppler effect correction
FFT processing is carried out with poor difference data, is then multiplied with adaptation function, IFFT is finally carried out and handles to obtain the narrow pulse pressure data of time domain.
Pulse compression module when process of pulse-compression is handled, will be identified according to waveform and be selected for the requirement for supporting more waveform pulses to compress
Respective FFT/IFFT point number and corresponding matching factor are selected, wherein matching factor storage is into ROM, after reading and after FFT transform
Data be multiplied, realize pulse compression.In order to reduce the processing delay of FFT/IFFT transformation, clock is handled using 200MHz, and
And before carrying out FFT, IFFT transformation in each PRF, using repositioning method, eliminate since accumulated time bring Doppler is imitated
It answers.
Specifically, carrying out pulse compressed data to 3 road signals using frequency matching method.Firstly, pulse compression module pair
3 roads after Doppler effect correction and poor difference data carry out FFT processing, due to transmitted waveform be not it is single, in order to be sent with waveform
The waveform that module is sent matches, and when being matched, to be identified according to waveform and select corresponding matching factor, then with matching
Multiplication finally carries out IFFT and converts to obtain the narrow pulse pressure data of time domain.In order to reduce cache resources, and in current PRF
Interior completion pulse pressure processing is postponed using the processing that 200MHz processing clock reduces FFT/IFFT transformation；And in each PRF into
Before row FFT, IFFT transformation, by the way of reset, eliminate due to accumulated time bring Doppler effect.
(10) echo reception module completes the high-speed transfer of pulse compressed data using SRIO interface.Data framing sends mould
Block receives 3 tunnel pulse pressure data, is sent to DSP module according to SRIO interface protocol after framing.Due to sending pulse compressed data
Length is to be identified and changed according to waveform, therefore equally identified using waveform to SRIO address field using the method for parameter transmitting
First address mapped, subaddressing carries out incremental according to the size of data；And using table tennis transmission mechanism, realize pulse pressure
The high-speed transfer of data.
Specifically, completing the high-speed transfer of pulse compressed data using SRIO interface.Since pulse time width is different, FFT point
Number must satisfy the requirement of pulse compression.Therefore the length for sending pulse compressed data is also variation.In order to reduce address space
Switching, framing sending module use parameter transmitting method, the first address of SRIO address field is mapped.Subaddressing according to
The size of data carries out being incremented by processing；And using table tennis transmission mechanism, realize the high-speed transfer of pulse pressure data.
It is as follows that chip configuration is completed after system power-on reset:
(1) in order to meet the design requirement of if radar receive-transmit system, chip configuration module is set as master after system reset
Back-up does not give the chips such as AD, DA, clock to send configuration data.Wherein spi bus agreement is deferred in the configuration of chip, when configuration is completed
Afterwards, corresponding indication signal is got higher.Wherein, the work clock of AD, DA chip by clock chip by being provided respectively.In the design,
Configuration file can be modified according to the requirement of system, be required to meet different bandwidth radar signal and receive.
The design of waveform transmitting module is as follows:
(1) waveform transmitting module completes the transmitting of a variety of linear FM signals.Control flow is as shown in Figure 2.Firstly, control
Signaling module carries out resampling and edge detection to CPI and PRF signal.Using CPI as the period, i.e., with the upper of first CPI signal
It rises edge and is used as and start, start DDS module and waveform count device in the rising edge of PRF signal；It is set when the value of waveform count device reaches
When definite value, stop sending waveform.For linear FM signal, when switching over to waveform, parameter selecting module utilizes parameter
Waveform parameter is assigned to corresponding variable by the method for transmitting, is completed the dynamic of waveform, is switched fast, frequency switching time can
To reach ns grades, meet the requirement of different distance detections of radar.
(2) waveform transmitting module completes the transmitting of a variety of specific waveforms.For particular requirement, such as phase-coded signal,
DDS module is unable to satisfy requirement, therefore uses the method based on Waveform storage.Control flow is as shown in Figure 3.After electrification reset,
Waveform module for reading and writing completes data load first, i.e., the Wave data for being stored in Flash and matching factor is cached in DDR2；
Then it using CPI signal as the period, i.e., is opened as beginning and using the rising edge of first CPI signal in the rising edge of PRF signal
Beginning reads data from DDR2, and by giving DA chip to send waveform after fixed delay.Specific waveforms can be applied to
It is anti-interference, when needing switching waveform, it is only necessary to change DDR2 and read address, can be achieved with being switched fast for waveform；And it can
To be identified according to waveform, is avoided interference source by changing length of delay, improve the ability of anti-interception of system.
(3) waveform transmitting module utilizes Multichannel Waveform synthetic method, meets high speed D/A sampling with low-speed processing clock and wants
It asks.For example, waveform sending module uses 16 road Wave datas, the method for being finally synthesizing 2 tunnels handles clock with 150MHz, real
Show DA chip 2.4GHz sampling request, can satisfy the transmitting of Wideband Intermediate Frequency radar signal, improves the reliable of system design
Property.
Echo reception module design is as follows:
(1) in order to guarantee correlative accumulation, echo reception module carries out resampling and edge detection to CPI and PRF signal.It connects
Collection of letters control module is using CPI as the period, that is, the rising edge of the first CPI signal received, which is used as, to be started, and PRF's
Failing edge starts echo wave signal acquisition module；When setting value is equal to gate delay value, start to adopt 4 road echo datas
Collection, and according to the corresponding points of waveform mark acquisition.Since A/D chip is in DDC treatment process, there are carrier components.Base band
Processing module will also involve the processing of 4 pumpings 1 to 4 road echo datas of acquisition progress, 2 tunnel synthesis, up-conversion, low pass filtered, obtain 4 tunnels
Baseband signal.Control flow is as shown in Figure 4.
(2) echo reception module utilizes signal processing method, pre-processes to baseband signal, eliminates channel difference and more
The general influence for strangling frequency deviation to pulse pressure result.Wherein Signal Pre-Processing Method includes channel calibration and difference difference and Doppler effect correction.By
There are amplitude phase errors between 4 paths needs to carry out channel compensation, wherein correcting to realize effective superposition of multiple signals
Coefficient is stored in peripheral storage, and the correction coefficient in 4 channels is read after powering on, then carries out the behaviour that is multiplied with base band data
Make.In order to obtain distance, the pitch information of target, basis and the poor calculation formula of difference 4 roadbed band signals are handled；In order to
Influence of the Doppler to coherent result is eliminated, Doppler is compensated before pulse pressure, therefore is carrying out arteries and veins with poor difference data
Before punching press contracting, Doppler is compensated；Wherein Doppler effect correction is using CPI as the period, according to the Doppler of DSP module offer
Frequency deviation control word is realized using DDS module and is compensated.Control flow is as shown in Figure 5.
(3) echo reception module completes process of pulse-compression to 3 road signals.After Doppler effect correction and poor difference data, arteries and veins
It rushes compression module to first have to handle by FFT, before FFT processing, data is carried out according to waveform mark to mend 0 processing, are met not
With the requirement of point FFT processing.Then it selects corresponding matching factor to carry out compression processing, then obtains time domain impulse after carrying out IFFT
Compressed data.In order to reduce FFT and IFFT processing delay, data are handled using high sampling rate.Framing sending module is again
Using SRIO interface by pulse pressure real-time data transmission to DSP module.Wherein, it is transmitted with DSP module data using table tennis transmission side
Method, and stored pulse pressure data into DDR3 using address mapping method.
The present embodiment additionally provides a kind of radar signal for supporting more waveforms and method of reseptance, and this method includes as follows
Step:
Waveform sending module acquires externally input CPI signal and PRF signal, and carries out to CPI signal and PRF signal
Edge detection obtains waveform transmitting pulse signal；DSP module sends instructions to waveform sending module, and waveform sending module is according to finger
Output waveform is enabled to identify；Parameter selecting module is identified according to waveform, obtains corresponding parameter；When waveform transmitting pulse signal is effective
When, generate Multichannel Waveform data；DA chip is sent after Multichannel Waveform data are synthesized；
It receives signal control module and acquires externally input CPI signal and PRF signal, and is equal to CPI signal and PRF signal
Edge detection is carried out to obtain receiving echo pulse signal；When reception echo pulse signal is effective, to 4 tunnels after A/D chip conversion
Digital signal is acquired, the digital signal after output acquisition；Digital signal after receiving acquisition, and obtained after centainly handling
To the baseband signal after down-sampled；According to the baseband signal after down-sampled, channel calibration is carried out respectively and difference is poor, Doppler's benefit
After repaying processing, 3 road signals are obtained；3 tunnel pulse pressure data are obtained after 3 road signals are carried out signal processing respectively；By 3 tunnel pulse pressure data
DSP module is sent to after carrying out framing.
Embodiment described above is the present invention more preferably specific embodiment, and those skilled in the art is in this hair
The usual variations and alternatives carried out in bright technical proposal scope should be all included within the scope of the present invention.
Claims (10)
1. a kind of radar signal for supporting more waveforms and reception system, characterized by comprising: FPGA module, DSP module
Composition；Wherein, FPGA module includes waveform sending module, echo reception module and chip configuration module；Wherein,
The waveform sending module acquires externally input CPI signal and PRF signal, and carries out to CPI signal and PRF signal
Edge detection obtains waveform transmitting pulse signal；DSP module sends instructions to the waveform sending module, and the waveform sends mould
Root tuber is identified according to instruction output waveform and is identified according to waveform, obtains corresponding parameter；When waveform transmitting pulse signal is effective,
Generate Multichannel Waveform data；DA chip is sent after Multichannel Waveform data are synthesized；
The reception signal control module acquires externally input CPI signal and PRF signal, and equal to CPI signal and PRF signal
Edge detection is carried out to obtain receiving echo pulse signal；When waveform reception echo pulse signal is effective, after A/D chip conversion
4 railway digital signals be acquired, output acquisition after digital signal；Digital signal after receiving acquisition, and centainly located
Obtained after reason it is down-sampled after baseband signal；According to the baseband signal after down-sampled, carries out channel calibration respectively and difference is poor, more
After general Le compensation deals, 3 road signals are obtained；3 tunnel pulse pressure data are obtained after 3 road signals are carried out signal processing respectively；By 3 road arteries and veins
Pressure data are sent to DSP module after carrying out framing；
Chip configuration module configures A/D chip, DA chip and multichannel clock chip.
2. the radar signal according to claim 1 for supporting more waveforms and reception system, it is characterised in that: the wave
Shape sending module includes signal control module, command analysis module, parameter selecting module, DDS module, waveform loading module and wave
Shape sending module；Wherein, signal control module acquires externally input CPI signal and PRF signal, and believes CPI signal and PRF
It number carries out edge detection and obtains waveform transmitting pulse signal；DSP module sends instructions to command analysis module, instruction parsing mould
Root tuber is according to instruction output waveform mark；The parameter selecting module is identified according to waveform, obtains corresponding parameter, and will be corresponding
Parameter is sent to DDS module；When waveform transmitting pulse signal is effective, starting DDS module generates Multichannel Waveform data；The wave
Shape loading module reads wave file from external memory and caches, when waveform transmitting pulse signal is effective, according to waveform mark
Know and corresponding address is selected to generate Multichannel Waveform data；What waveform sending module reception DDS module or waveform loading module generated
Multichannel Waveform data send DA chip after being synthesized.
3. the radar signal according to claim 1 for supporting more waveforms and reception system, it is characterised in that: described time
Wave receiving module includes receiving signal control module, echo wave signal acquisition module, baseband signal processing module, Signal Pretreatment mould
Block, process of pulse-compression module and data framing sending module；Wherein,
It receives signal control module and acquires externally input CPI signal and PRF signal, and CPI signal and PRF signal are carried out
Edge detection obtains receiving echo pulse signal；When waveform reception echo pulse signal is effective, start echo wave signal acquisition mould
Block；Echo wave signal acquisition module using JESD204B interface it is synchronous with A/D chip foundation after, to A/D chip conversion after 4 railway digitals
Signal is acquired, the digital signal after output acquisition；Baseband signal processing module receives the digital signal after acquisition, and carries out
Obtained after certain processing it is down-sampled after baseband signal；Signal pre-processing module receive it is down-sampled after baseband signal, respectively into
Row of channels calibration and after difference is poor, Doppler effect correction is handled, obtains 3 road signals；Process of pulse-compression module receives 3 road signals, point
3 tunnel pulse pressure data carry out not be obtained after signal processing；Data framing sending module receives 3 tunnel pulse pressure data, sends out after carrying out framing
Give DSP module.
4. the radar signal according to claim 2 for supporting more waveforms and reception system, it is characterised in that: described
Parameter selecting module is identified according to waveform, is obtained in corresponding parameter, and the parameter is phase increment and stepping.
5. the radar signal according to claim 2 for supporting more waveforms and reception system, it is characterised in that: waveform hair
Penetrate the effective criterion of pulse signal are as follows: as launch time > 7ns of waveform transmitting pulse signal, it is effective that waveform emits pulse signal.
6. the radar signal according to claim 3 for supporting more waveforms and reception system, it is characterised in that: waveform connects
Withdraw the effective criterion of wave pulse signal are as follows: when waveform receives launch time > 10ns of echo pulse signal, waveform receives echo
Pulse signal is effective.
7. the radar signal according to claim 3 for supporting more waveforms and reception system, it is characterised in that: base band letter
Number processing module receives the digital signal after acquisition, and completes up-conversion, filtering and extraction processing, obtain it is down-sampled after base band
Signal.
8. the radar signal according to claim 3 for supporting more waveforms and reception system, it is characterised in that: pulse pressure
Contracting processing module receives 3 road signals, after carrying out FFT, matched filtering, IFFT processing respectively, obtains 3 tunnel pulse pressure data.
9. the radar signal according to claim 3 for supporting more waveforms and reception system, it is characterised in that: data group
Frame sending module receives 3 tunnel pulse pressure data, by SRIO interface is sent to DSP module after carrying out framing.
10. a kind of radar signal for supporting more waveforms and method of reseptance, which is characterized in that the method includes walking as follows
It is rapid:
Waveform sending module acquires externally input CPI signal and PRF signal, and carries out edge to CPI signal and PRF signal
Extraction obtains waveform transmitting pulse signal；DSP module sends instructions to waveform sending module, and waveform sending module is defeated according to instructing
Waveform identifies out；Parameter selecting module is identified according to waveform, obtains corresponding parameter；When waveform transmitting pulse signal is effective,
Generate Multichannel Waveform data；DA chip is sent after Multichannel Waveform data are synthesized；
It receives signal control module and acquires externally input CPI signal and PRF signal, and CPI signal and PRF signal are carried out
Edge detection obtains receiving echo pulse signal；When waveform reception echo pulse signal is effective, to 4 tunnels after A/D chip conversion
Digital signal is acquired, the digital signal after output acquisition；Digital signal after receiving acquisition, and obtained after centainly handling
To the baseband signal after down-sampled；According to the baseband signal after down-sampled, channel calibration is carried out respectively and difference is poor, Doppler's benefit
After repaying processing, 3 road signals are obtained；3 tunnel pulse pressure data are obtained after 3 road signals are carried out signal processing respectively；By 3 tunnel pulse pressure data
DSP module is sent to after carrying out framing.
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