CN110426679A - The method that phase-coded signal signal interference ratio improves - Google Patents
The method that phase-coded signal signal interference ratio improves Download PDFInfo
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- CN110426679A CN110426679A CN201910657735.4A CN201910657735A CN110426679A CN 110426679 A CN110426679 A CN 110426679A CN 201910657735 A CN201910657735 A CN 201910657735A CN 110426679 A CN110426679 A CN 110426679A
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- phase
- doppler
- doppler frequency
- interference ratio
- pulse pressure
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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
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses the methods that phase-coded signal signal interference ratio improves, and belong to field of signal processing, comprising: step 1: speed separation and compensation, solve pulse pressure major-minor caused by target velocity than loss；Target velocity can correspond to Doppler frequency-shift, to N number of adjacent transmission period, the acquisition storage of same distance cell data, and carry out N point FFT calculating, N number of channel data is obtained, so that friction speed target is separated to different channels；Doppler compensation, the n-th road offset are carried out to each channel are as follows: n*fr/N+m*fr, fr are transmitting pulse recurrence frequency, and m is the folding times that target doppler frequency corresponds to fr；Step 2: channel noise reduction, solves signal interference ratio caused by noise and loses；The filter that high stop band inhibits is designed, each channel useful signal out-of-band noise is filtered out；Step 3: mismatch pulse pressure, selects big output, further increases signal interference ratio；Mismatched filter is encoded using least square method designed phase；To the big output of multichannel data choosing after mismatch pulse pressure, final output value is obtained.
Description
Technical field
The present invention relates to the methods that signal processing technology more particularly to signal interference ratio improve.
Background technique
Firstly, phase code major-minor compares phase change sensitivity.The coded pattern feature of phase code, is become by phase
Change embodiment, by taking four phases coding as an example, four phases represent four kinds of code element informations, every 90 degree of the variation of phase, the symbol represented
Information change is primary.Moving target Doppler frequency-shift can have an impact the phase of phase code, be converted into the change of code element information
Change, changes the pattern of echo, to reduce correlation of the echo with pulse compression coefficient, influence pulse pressure signal interference ratio.Secondly, noise is dry
Disturb reduction signal interference ratio；Powerful noise jamming, makes the saturation of receiver, is submerged in echo-signal in noise signal, leads to letter
The reduction of dry ratio.Finally, when phase code carries out pulse pressure using matched filter and related algorithm, pulse pressure major-minor ratio and time width
Bandwidth product is related, and when Timed automata is smaller, major-minor is relatively low, and main lobe is easier to be submerged in noise.
Traditional Processing of Phase Coded Signals process be (" improvement of hard-limiting phase-coded signal detection performance " author:
Zhang Bo, quiet " external naval technology radar and confrontation " the Z1 phase in 1988 is protected): the first step samples base band echo, and hard
Amplitude limiting processing, to remove influence of the amplitude variation to signal interference ratio；Second step carries out matching pulse pressure to the signal after hard-limiting,
Come out target echo from noise saliency；Third step gives data after processing to follow-up equipment.There are following for traditional method
Problem: firstly, not carrying out Doppler frequency-shift compensation to Moving Target Return, phase code signal interference ratio will increase with Doppler frequency-shift
And decline rapidly；Secondly, hard-limiting processing has a higher noise gate, it is unfavorable for small target detection；Finally, matching arteries and veins
Press its pulse pressure major-minor ratio related with Timed automata, when Timed automata is smaller, major-minor is relatively low, and main lobe is easier to be submerged in
In noise.
Summary of the invention
The object of the present invention is to provide phase-coded signal signal interference ratio improvement methods, so that solving 1. Doppler frequency-shifts causes
The decline of phase code signal interference ratio, influence of 2. noises to phase code signal interference ratio, 3. traditional four phase codes match pulse pressures, major-minor
It is higher than not, three problems.
The technology of the present invention solution is: the first step, and speed separation and compensation, the step are mainly realized to echo-signal
Doppler frequency compensation；To N number of adjacent transmission period, same distance unit baseband I/Q data acquisition storage, and carry out N point FFT meter
It calculates；It is analyzed from frequency domain, above-mentioned calculating is equivalent to moving target by Doppler filters group；The Doppler filters group is adjacent
Filter passband 1/2 is overlapped, and filter group passband covers entire doppler frequency variation range；When pulse recurrence frequency is fr
When, if [0, fr] is the first doppler frequency area, any Doppler frequency-shift is converted as the period using fr and is calculated into the first Doppler area；
N point FFT operation forms N number of narrow band filter in the first Doppler area, and friction speed target is separated to different channels；To every
A channel carries out Doppler compensation, the n-th road offset are as follows: n*fr/N+m*fr, fr are transmitting pulse recurrence frequency, and m is that target is more
Spectrum strangles the folding times that frequency corresponds to fr, and wherein m variation range can be pre- by the empirical value of moving target Doppler frequency shift range
First calculate setting；The step is the compensation of Doppler approximation, and offset is the centre frequency of each narrow band filter, moves mesh after compensation
Marking minimum Doppler frequency-shift range is [- fr/ (2*N) ,+fr/ (2*N)]；The step final output m*N circuit-switched data；Step 2: logical
Road noise reduction, the step filter out the noise outside signal echo effective bandwidth, reduce echo noise energy；Design pass band width is phase
Encoded signal bandwidth, passband ripple are less than 0.1dB, and stopband inhibits the filter for being greater than 60dB；The m*N number that the first step is obtained
According to being filtered respectively；Step 3: mismatch pulse pressure, selects big output, which inhibits pulse pressure pair by way of mismatch pulse pressure
Valve further increases signal interference ratio；PSK sequence are as follows: P, sequence long L, L are even number, and null sequence X, the long M > L of sequence are then minimum
Square law designed phase coding mismatched filter COEFFICIENT K can be calculated by calculating formula (1), (2), (3).To m*N circuit-switched data into
Row mismatch pulse pressure, and select big output.
S=[X P X](2M+L)x1 (1)
K=(ST*S)-1*ST*yT (4)
Phase-coded signal signal interference ratio improvement method of the present invention is it has the advantage that: the first step, speed separation and compensation；Make
Doppler frequency shift constrains in [- fr/ (2*N) ,+fr/ (2*N)] range, reduces Doppler frequency shift to the shadow of pulse pressure major-minor ratio
It rings；Second step, channel noise reduction；The narrow band filter that high stop band inhibits inhibits out-of-band noise, noise energy is reduced, to have
Effect improves signal interference ratio；Third step, mismatch pulse pressure select big output；With the method for mismatch pulse pressure, it is suppressed that minor lobe, thus into one
Step improves signal interference ratio.
Technical solution of the invention is described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the functional block diagram of phase-coded signal signal interference ratio improvement method.
Specific embodiment
The functional block diagram of phase-coded signal signal interference ratio improvement method of the present invention is referring to Fig. 1.Specific implementation step is as follows:
Step 1: speed separation and compensation；1. pair N number of adjacent transmission period, baseband I/Q data are acquired storage, together
The storing data of distance unit carries out N point FFT and calculates, and forms the data of the road N speed separation, i.e., N number of narrow band filter output；N
Selection: use MATLAB tool, carry out phase-coded signal superposition doppler frequency pulse pressure emulation, superposition Doppler frequency
Rate value are as follows: fr/ (2*N) chooses N value when its major-minor is less than 2dB than deteriorating；2. pair above walk obtained N circuit-switched data, each road respectively into
Row Doppler effect correction, offset n*fr/N+m*fr export m*N circuit-switched data.
Step 2: channel noise reduction；1. design passband is phase-coded signal bandwidth, passband ripple is less than 0.1dB, stopband suppression
System is greater than the filter of 60dB；2. the m*N circuit-switched data of pair step 1 output filters respectively.
Step 3: mismatch pulse pressure, selects big output；1. obtaining mismatch pulse pressure filter coefficient by formula (1), (2), (3)；2.
Progress mismatch pulse pressure respectively is filtered respectively to the m*N circuit-switched data of step 2 output；3. a pair m*N circuit-switched data carries out selecting big output.
Claims (2)
1. the method that phase-coded signal signal interference ratio improves, it is characterised in that:
The first step, speed separation and compensation；Baseband I/Q data acquisition storage to N number of adjacent transmission period, same distance unit
Storing data carries out the filtering processing of Doppler filter group and calculate that N point FFT is constituted；The adjacent filtering of Doppler filter group
The passband of device is according to 1/2 bandwidth overlay, and filter group passband covers entire Doppler frequency variation range；When pulse repeats frequency
When rate is fr, if [0, fr] is the first Doppler frequency area, any Doppler frequency shift folds into the first Doppler by the period of fr
Area calculates；N point FFT operation forms N number of narrow band filter in the first Doppler region, corresponds to the not synchronized of different Doppler frequency shifts
Degree target separates after filter group to different channels；Doppler effect correction, the approximate offset on the n-th tunnel are carried out to each channel
Are as follows: n*fr/N+m*fr, fr are transmitting pulse recurrence frequency, and m is the folding times that target Doppler frequency corresponds to fr, wherein m
Variation range can precalculate setting by the empirical value of moving target Doppler frequency shift range；Offset corresponds to each narrow-band filtering
The centre frequency of device, moving target Doppler frequency shift range is [- fr/ (2*N) ,+fr/ (2*N)] after compensation；The step is finally defeated
M*N circuit-switched data out；
Second step, channel noise reduction；Design pass band width is phase-coded signal bandwidth, and passband ripple is less than 0.1dB, and stopband inhibits
Filter greater than 60dB；The m*N circuit-switched data that the first step obtains is filtered respectively；
Step 3: mismatch pulse pressure, selects big output；PSK sequence are as follows: P, sequence long L, L are even number；Null sequence X, the long M of sequence
>L；Then least square method designed phase coding mismatched filter COEFFICIENT K can be calculated by calculating formula (1), (2), (3)；To m*N
Circuit-switched data carries out mismatch pulse pressure, and selects big output；
S=[X P X](2M+L)x1(1)；
Y=[0 ... 010 ... 0](2M+L)x1, wherein sequenceRemaining is 0 (3)；
K=(ST*S)-1*ST*yT (4)。
2. the method that phase-coded signal signal interference ratio according to claim 1 improves, it is characterised in that: first leg speed
In degree separation and compensation: to N number of adjacent transmission period, same distance unit baseband I/Q data carries out N point FFT and calculates；FFT points N
Selection: carry out phase-coded signal superposition doppler frequency pulse pressure emulation, the doppler frequency value of superposition are as follows: fr/ (2*N)
When, choose N value when pulse pressure major-minor is less than 2dB than deteriorating.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112068122A (en) * | 2020-09-09 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Doppler compensation method of phase coding signal based on tracking information |
| CN113109779A (en) * | 2020-02-28 | 2021-07-13 | 加特兰微电子科技(上海)有限公司 | Method for improving target detection precision, integrated circuit, radio device and electronic equipment |
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| US5175743A (en) * | 1991-11-22 | 1992-12-29 | Bell Communications Research, Inc. | Spread-time code division multiple access technique with arbitrary spectral shaping |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113109779A (en) * | 2020-02-28 | 2021-07-13 | 加特兰微电子科技(上海)有限公司 | Method for improving target detection precision, integrated circuit, radio device and electronic equipment |
| CN113109779B (en) * | 2020-02-28 | 2024-03-22 | 加特兰微电子科技(上海)有限公司 | Method for improving target detection precision, integrated circuit, radio device and electronic equipment |
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