CN107340505A - The generation structure and method of a kind of radar signal - Google Patents
The generation structure and method of a kind of radar signal Download PDFInfo
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- CN107340505A CN107340505A CN201710529728.7A CN201710529728A CN107340505A CN 107340505 A CN107340505 A CN 107340505A CN 201710529728 A CN201710529728 A CN 201710529728A CN 107340505 A CN107340505 A CN 107340505A
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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
- G01S7/40—Means for monitoring or calibrating
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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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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention provides a kind of the generation structure and method of radar signal, and method is as follows, the generation circuit structure of first framework radar signal；Frequency will be put caused by the first DDS module (5) again with baseband noise caused by baseband noise signal generator module (4) through frequency mixing module (6) orthogonal modulation；Then the filtered module of data signal (7) upper step system obtained obtains mid-frequency noise；Then to the control of intermediate frequency noise amplitude and impulse modulation to obtain noise interferences；It is finally that noise interferences and radar self-test signal caused by the second DDS module (10) are superimposed, and the data of acquisition are exported to integrated self-test noise interferences after the digital-to-analogue conversion of DAC (2).The present invention noise interferences that script is provided by external equipment are integrated in radar, using the signal self-test passage of radar, realize the self-test to Anti-jamming Ability for Radar, overcome conventional noise interference simulator cost height, complex interfaces, it is not portable the shortcomings that.
Description
Technical field
The invention belongs to radar and electronic warfare field, and in particular to a kind of radar self-test signal and noise interferences one
Structure caused by change and method.
Background technology
Noise jamming is using a kind of very extensive, very effective to various radar chaffs interference in electronic warfare system
Means.When designing radar, it is necessary to consider the anti-noise jamming ability and verification method of radar.
Noise interferences are mainly produced by noise interferences simulator at present, received by the receiving channel of radar,
By down coversion, digital sample and signal transacting, to verify the anti-noise jamming function of radar.
Noise jamming simulator is the equipment for being totally independent of radar, somewhat expensive, can not largely be configured.Needed during use
Radar provides a variety of radiofrequency signals and pulse signal, and external electrical annexation is complicated, and it is electric that user of service need to be fully understood by its
Ability smooth operation uses after relation, workflow, and verification method is more complicated.The volume of noise jamming simulator is larger, is not easy
Carry, be adapted to use in electronic warfare complex laboratory, be not suitable for radar scheduling and planning usually and outfield debugging.
Existing scheme is needed to design noise jamming simulator, and the generation of noise interferences is realized with simulator.In order to more
The anti-noise jamming ability of radar is conveniently verified, it is necessary to which a kind of radar signal production method, is producing radar self-test letter
Number while produce noise interferences, the self-test for radar.
The content of the invention
It is an object of the invention to provide a kind of radar self-test signal based on FPGA and DAC and noise interferences one
Change and produce structure and method, the noise interferences that script is provided by external equipment are integrated in radar, use the letter of radar
Number self-test passage, realizes the self-test to Anti-jamming Ability for Radar, overcomes that conventional noise interference simulator cost is high, interface is multiple
The shortcomings that miscellaneous, not portable.
The purpose of the present invention is achieved through the following technical solutions：A kind of generation structure of radar signal, including FPGA, DAC,
Wave filter, it is integrated with the FPGA and is preset with the baseband noise signal generator module of noise bandwidth parameter, is preset with noise
First DDS module of frequency of heart parameter, frequency mixing module, filtration module, amplitude control module, pulse modulation module, it is preset with thunder
Up to the second DDS module of self-test signal parameter, caused by point frequency caused by the first DDS module and baseband noise signal generator module
For baseband noise through frequency mixing module orthogonal modulation, the filtered module of data signal that orthogonal modulation obtains obtains mid-frequency noise, then passes through
Amplitude control module regulation noise amplitude, pulse modulation module carry out break-make control or impulse modulation to noise, to obtain noise
Interference signal, the noise interferences then with the second DDS module caused by radar self-test signal be added, through DAC digital-to-analogues
Conversion, wave filter obtain self-test noise interferences after filtering out image frequency.
Preferably, pseudo-random number sequence module, LPF mould are integrated with the baseband noise signal generator module
Block, noise bandwidth parameter are defaulted among low-pass filtering module, and pseudo-random number sequence module is used to build m-sequence, and m-sequence is through low
Baseband noise is obtained after pass filtering module filtering.
Preferably, the m-sequence expression formula is f (X)=1+C1X1+C2X2+ ...+CiXi+ ...+CnXn, in formula, Xi
(i=0,1 ..., n) represents the state of i-stage register, and Ci is coefficient, and the two all only takes 0 or 1, and passes through pseudo noise
Repetition period formula verifies that repetition period formula is T=2n/ f, in formula, n is the series of shift register, and f is shift clock frequency
Rate.
Preferably, baseband noise caused by the baseband noise signal generator module is divided into I, Q two-way baseband signal, the
Point frequency division is sin (2 π w caused by one DDS module0And cos (2 π w n)0N) two paths of signals, I roads and sin (2 π w0N) road is multiplied, Q
Road and cos (2 π w0N) it is multiplied, two are multiplied, and the filtered module of phase adduction obtains mid-frequency noise to the signal obtained again.
A kind of production method of radar signal, comprises the following steps,
Step 1：The generation circuit structure of framework radar signal；
Step 2：Point frequency caused by first DDS module is with baseband noise caused by baseband noise signal generator module through mixed
Frequency module orthogonal modulation；
Step 3：The filtered module of data signal that step 2 orthogonal modulation is obtained obtains mid-frequency noise；
Step 4：To the control of intermediate frequency noise amplitude and impulse modulation to obtain noise interferences；
Step 5：Noise interferences and radar self-test signal caused by the second DDS module are superimposed；
Step 6：The data that step 5 obtains are exported to the self-test noise jamming of integration after DAC digital-to-analogue conversion
Signal.
A kind of generation structure of radar signal provided by the present invention and the beneficial effect of method be, 1, thunder can be reduced
Up to the corollary equipment of special noise jamming simulator, reduction of expenditure；2nd, directly realized on radar, compared to the side using simulator
Method can produce in radar without the hardware and software interface of complexity and debugging process easily uses, improve radar antinoise
The efficiency of interference performance checking；3rd, implementation method is directly produced in radar signal generation circuit, it is not necessary to changes radar
Hardware and software framework, it is easy to promote on radar caused by signal in various realize using FPGA and DAC.
Brief description of the drawings
Fig. 1 is expressed as self-test noise interferences generation circuit block architecture diagram in the present invention；
Fig. 2 is expressed as baseband noise signal generator module block diagram in the present invention；
Fig. 3 is expressed as realizing the n level linear feedback shift register block diagrams of pseudo-random number sequence in the present invention；
Fig. 4 is expressed as realizing baseband noise signal and local oscillation signal progress IQ modulation in the present invention block diagram of up-conversion.
Reference：
1-FPGA, 2-DAC, 3- wave filter, 4- baseband noises signal generator module, the DDS modules of 5- first, 6- mixing moulds
Block, 7- filtration modules, 8- amplitude control modules, 9- pulse modulation modules, the DDS modules of 10- second, 41- pseudo-random number sequence moulds
Block, 42- low-pass filtering modules.
Embodiment
To make the purpose, technical scheme and advantage that the present invention is implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label represent same or similar element or the element with same or like function.Described embodiment is the present invention
Part of the embodiment, rather than whole embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to uses
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The generation structure and method of radar signal of the invention are described in further details below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of generation structure of radar signal, including FPGA1, DAC-circuit 2, wave filter 3, collect in FPGA1
Into the first DDS for having the baseband noise signal generator module 4 for being preset with noise bandwidth parameter, being preset with noise center-frequency parameters
Module 5, frequency mixing module 6, filtration module 7, amplitude control module 8, pulse modulation module 9, it is preset with radar self-test signal parameter
The second DDS module 10.
Pseudo-random number sequence module 41, low-pass filtering module 42 are integrated with baseband noise signal generator module 4, sees Fig. 2
Shown, noise bandwidth parameter is defaulted among low-pass filtering module 42, and pseudo-random number sequence module 41 is used to build m-sequence, its
In, m-sequence expression formula is f (X)=1+C1X1+C2X2+ ...+CiXi+ ...+CnXn, and Xi (i=0,1 ..., n) represents the in formula
The state of i level registers, Ci are coefficient, and the two all only takes 0 or 1, and is verified by the repetition period formula of pseudo noise, weight
Multiple Period Formula is T=2n/ f, n is the series of shift register in formula, and f is shift clock frequency.The low-pass filtered mould of m-sequence
Block 42 obtains baseband noise after filtering.
Point frequency caused by first DDS module 5 is with baseband noise caused by the baseband noise signal generator module 4 of acquisition through mixed
The orthogonal modulation of frequency module 6, the filtered module 7 of data signal that orthogonal modulation obtains obtain mid-frequency noise, specially baseband noise
Baseband noise caused by signal generator module 4 is divided into I, Q two-way baseband signal, and point frequency division is sin caused by the first DDS module 5
(2πw0And cos (2 π w n)0N) two paths of signals, I roads and sin (2 π w0N) road is multiplied, Q roads and cos (2 π w0N) it is multiplied, two, which are multiplied, obtains
The filtered module 7 of phase adduction obtains mid-frequency noise to the signal obtained again.
Mid-frequency noise through amplitude control module 8 adjust noise amplitude, pulse modulation module 9 to noise carry out break-make control or
Impulse modulation, to obtain noise interferences, the noise interferences then with the second DDS module 10 caused by radar self-test believe
Number it is added, self-test noise interferences is obtained after the digital-to-analogue conversion of DAC-circuit 2, wave filter 3 filter out image frequency.
The relevant operating method that structure is produced according to radar signal above is described below.
Step 1：The generation circuit structure of framework radar signal.
As shown in figure 1, mainly it is made up of on hardware FPGA1 and DAC2 chips.FPGA1 receives various control parameters, passes through
System Generator build module in FPGA1, realize the generation of noise interferences and radar self-test signal；DAC2 believes
Number by FPGA1 output data signal be converted to simulation model, after filtered, by caused self-test noise signal supply radar make
With.
Noise interferences are directly produced with FPGA1 internal resources, it is not necessary to are increased, changed hardware, only in control interface
The related control instruction of increase is to realize the control to noise interferences parameters.The noise jamming relevant parameter such as institute of table 1
Show, the digit of each parameter can modify according to the actual requirements.
The noise jamming parameter definition of table 1
Radar self-test signal is produced by the second DDS module 10, i.e., using the original self-test signal of radar, it is not necessary to which design changes
It is dynamic.
Step 2：Baseband noise signal generator module 4 produces baseband noise.
Baseband noise signal produces block diagram such as Fig. 2, and pseudo-random sequence module 41, low is built using System Generator
Pass filtering module 42, the parameter of low-pass filtering module 42 is selected according to noise bandwidth parameter, and filtering obtains the base band of different bandwidth
Noise signal.
In numerous noise types, the noise signal of Gaussian Profile is the most frequently used one kind, the baseband noise in the present invention
Signal uses Gauss band limited white noise.It is theoretical according to random signal, whitening processing, Neng Goushi are carried out to equally distributed random number
Now there is the white Gaussian noise of good statistical property.M-sequence is a kind of the most frequently used pseudo-random sequence.Pseudorandom in the present invention
Sequence uses m-sequence, and noise caused by the method is pseudo noise, as long as the cycle long enough of pseudo noise, so that it may
To replace real random noise application.
M-sequence generator is made up of the multi-stage shift register with feedback of status, logically can be by it such as Fig. 3
Polynomial expression is connected, its general type is:
F (X)=1+C1X1+C2X2+ ...+CiXi+ ...+CnXn (formula 1)
In formula, Xi (i=0,1 ..., n) represents the state of i-stage register, and Ci is coefficient, and the two all only takes 0 or 1.
The repetition period of pseudo noise is：
T=2n/f (formula 2)
In formula, n is the series of shift register, and f is shift clock frequency.
According to the realization principle of m-sequence, m-sequence is built using System Generator, and obtain from m-sequence tap
The pseudo-random number sequence of even distribution.The shift register that m-sequence employs 32 1bit is built in the present embodiment, and to this 32
Shift register is randomly provided initial value, and initial value is chosen in 0 or 1.The calculating of feedback factor is carried out using logic unit, this
The type of a little logic units has or logic, XOR, with logic, negate logic.Building the shift clock frequency of m-sequence is
100MHz, calculated according to formula 2, the cycle for the pseudo random number built is 42.95s.Namely caused by this pseudo-random sequence
The repetition period of baseband noise signal is 42.95s, disclosure satisfy that detections of radar antijamming capability uses.
Step 3：Point frequency caused by first DDS module 5 is with baseband noise through the orthogonal modulation of frequency mixing module 6, the numeral of acquisition
The filtered module 7 of signal obtains mid-frequency noise, i.e. noise signal Digital Up Convert.
FPGA1 receives the center-frequency parameters of noise interferences, and noise interferences are produced by the first DDS module 5
Centre frequency local oscillation signal, by being mixed and filtering, baseband noise signal caused by step 2 is upconverted to the center of requirement
On frequency, block diagram such as Fig. 4 is realized.
Frequency mixing module 6 is by I, Q two paths of signals from baseband noise signal generator module 4 and from the first DDS module 5
I, Q two-way local oscillation signal is mixed, and exports mid-frequency noise signal.
In practical application, as long as needing to be mixed the solid part signal of output, the calculation formula of the intermediate-freuqncy signal of output is：
Dout=I (n) sin (2 π w0n)+Q(n)cos(2πw0N) (formula 3)
Wherein, dout represents the mid-frequency noise signal of mixing output；I (n) and Q (n) is I, Q caused by baseband noise module
Two-way baseband signal；sin(2πw0And cos (2 π w n)0N) it is that I, Q two-way that centre frequency caused by the first DDS module 5 is f0 are believed
Number.
Wave filter is designed using System Generator filter design tools FDATool, is believed according to baseband noise
The index request of number bandwidth, design the parameters of low-pass filtering module 42.
Step 4：To the control of intermediate frequency noise amplitude and impulse modulation to obtain noise interferences.
In order to preferably test the antijamming capability of radar, the amplitude of self-test noise interferences can caused by the present invention
Control, impulse modulation are controllable.
Mid-frequency noise signal caused by step 3 is normalized, the DAC2 selected according to rear class bit wide is come really
Determine the bit wide of amplitude registers, the amplitude of caused noise interferences is carried out according to the noise amplitude parameter that FPGA1 is received
Control.
The modulation pulse parameter received according to FPGA1 produces pulse, and impulse modulation is carried out to noise interferences.Output
Noise interferences have " logical ", " disconnected ", " impulse modulation " three kinds of states.By the control to pulse parameter, each inter-species is realized
Disconnected noise jamming, impulse noise interference.
Step 5：Noise interferences and radar self-test signal caused by the second DDS module 10 are superimposed, according to rear class
The bit wide of DAC2 chips, the data bit width of noise interferences and radar self-test signal is adjusted, makes the data after addition
Do not spill over.After the digital-to-analogue conversion of DAC2 chips, the signal of output is the self-test noise interferences of integration, and this signal leads to
The self-test passage of radar is crossed, the function of radar anti-noise jamming can be verified.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should using the scope of the claims as
It is accurate.
Claims (5)
1. a kind of generation structure of radar signal, including FPGA (1), DAC (2), wave filter (3), it is characterised in that the FPGA
(1) it is integrated with and is preset with the baseband noise signal generator module (4) of noise bandwidth parameter, is preset with noise center-frequency parameters
The first DDS module (5), frequency mixing module (6), filtration module (7), amplitude control module (8), pulse modulation module (9), default
There is the second DDS module (10) of radar self-test signal parameter, point frequency caused by the first DDS module (5) produces with baseband noise signal
The filtered module of data signal that baseband noise caused by raw module (4) obtains through frequency mixing module (6) orthogonal modulation, orthogonal modulation
(7) mid-frequency noise is obtained, then noise amplitude, pulse modulation module (9) are adjusted to noise progress break-make through amplitude control module (8)
Control or impulse modulation, to obtain noise interferences, the noise interferences then with the second DDS module (10) caused by thunder
It is added up to self-test signal, self-test noise interferences is obtained after DAC (2) digital-to-analogue conversion, wave filter (3) filter out image frequency.
2. the generation structure of radar signal according to claim 1, it is characterised in that the baseband noise signal produces mould
Pseudo-random number sequence module (41), low-pass filtering module (42) are integrated with block (4), noise bandwidth parameter defaults in LPF
Among module (42), pseudo-random number sequence module (41) is used to build m-sequence, after the low-pass filtered module of m-sequence (42) filtering
Obtain baseband noise.
3. the generation structure of radar signal according to claim 2, it is characterised in that the m-sequence expression formula is f
(X)=1+C1X1+C2X2+ ...+CiXi+ ...+CnXn, in formula, Xi (i=0,1 ..., n) represents the state of i-stage register, Ci
For coefficient, the two all only takes 0 or 1, and verifies that repetition period formula is T=2 by the repetition period formula of pseudo noisen/
F, in formula, n is the series of shift register, and f is shift clock frequency.
4. the generation structure of radar signal according to claim 2, it is characterised in that the baseband noise signal produces mould
Baseband noise caused by block (4) is divided into I, Q two-way baseband signal, and it is sin (2 π w to put frequency division caused by the first DDS module (5)0n)
With cos (2 π w0N) two paths of signals, I roads and sin (2 π w0N) road is multiplied, Q roads and cos (2 π w0N) it is multiplied, the letter that two multiplications obtain
The filtered module of phase adduction (7) obtains mid-frequency noise number again.
A kind of 5. production method of radar signal according to claim 1, it is characterised in that comprise the following steps,
Step 1：The generation circuit structure of framework radar signal；
Step 2：Point frequency caused by first DDS module (5) passes through with baseband noise caused by baseband noise signal generator module (4)
Frequency mixing module (6) orthogonal modulation；
Step 3：The filtered module of data signal (7) that step 2 orthogonal modulation is obtained obtains mid-frequency noise；
Step 4：To the control of intermediate frequency noise amplitude and impulse modulation to obtain noise interferences；
Step 5：Noise interferences and radar self-test signal caused by the second DDS module (10) are superimposed；
Step 6：The self-test noise jamming that the data that step 5 obtains are exported to integration after the digital-to-analogue conversion of DAC (2) is believed
Number.
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| CN107682011A (en) * | 2017-09-26 | 2018-02-09 | 天津光电通信技术有限公司 | A kind of adjustable signal generator of intermediate frequency of signal to noise ratio and implementation method |
| CN108181616A (en) * | 2017-12-20 | 2018-06-19 | 西安电子科技大学 | A kind of method that digital radar interference is generated based on System Generator |
| CN109085542A (en) * | 2018-08-07 | 2018-12-25 | 中国航空工业集团公司雷华电子技术研究所 | A kind of binary channels wideband-radar signal generation system and signal generating method |
| CN111239700A (en) * | 2020-01-20 | 2020-06-05 | 上海志良电子科技有限公司 | Gaussian white noise generator based on FPGA and suppression interference simulator |
| CN113612522A (en) * | 2021-08-13 | 2021-11-05 | 陕西航天技术应用研究院有限公司 | Frequency domain deviation processing method and device |
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| CN114755644A (en) * | 2022-04-18 | 2022-07-15 | 扬州宇安电子科技有限公司 | Radar anti-interference detection optimization system and method based on simulation technology |
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| CN107682011A (en) * | 2017-09-26 | 2018-02-09 | 天津光电通信技术有限公司 | A kind of adjustable signal generator of intermediate frequency of signal to noise ratio and implementation method |
| CN108181616A (en) * | 2017-12-20 | 2018-06-19 | 西安电子科技大学 | A kind of method that digital radar interference is generated based on System Generator |
| CN109085542A (en) * | 2018-08-07 | 2018-12-25 | 中国航空工业集团公司雷华电子技术研究所 | A kind of binary channels wideband-radar signal generation system and signal generating method |
| CN111239700A (en) * | 2020-01-20 | 2020-06-05 | 上海志良电子科技有限公司 | Gaussian white noise generator based on FPGA and suppression interference simulator |
| CN113612522A (en) * | 2021-08-13 | 2021-11-05 | 陕西航天技术应用研究院有限公司 | Frequency domain deviation processing method and device |
| CN113612522B (en) * | 2021-08-13 | 2023-03-07 | 陕西航天技术应用研究院有限公司 | Frequency domain deviation processing method and device |
| CN113702924A (en) * | 2021-08-31 | 2021-11-26 | 安徽隼波科技有限公司 | Method for realizing radar target interference simulator based on digital noise modulation |
| CN114397624A (en) * | 2022-03-22 | 2022-04-26 | 北京蓝天航空科技股份有限公司 | Data configuration-based compatible radar self-checking picture generation method and device |
| CN114397624B (en) * | 2022-03-22 | 2022-07-15 | 北京蓝天航空科技股份有限公司 | Data configuration-based compatible radar self-inspection picture generation method and device |
| CN114755644A (en) * | 2022-04-18 | 2022-07-15 | 扬州宇安电子科技有限公司 | Radar anti-interference detection optimization system and method based on simulation technology |
| CN114755644B (en) * | 2022-04-18 | 2022-10-21 | 扬州宇安电子科技有限公司 | Radar anti-interference detection optimization system and method based on simulation technology |
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