CN107167772A - A kind of phase code eliminates co-channel interference method and system - Google Patents
A kind of phase code eliminates co-channel interference method and system Download PDFInfo
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- CN107167772A CN107167772A CN201710319962.7A CN201710319962A CN107167772A CN 107167772 A CN107167772 A CN 107167772A CN 201710319962 A CN201710319962 A CN 201710319962A CN 107167772 A CN107167772 A CN 107167772A
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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
-
- 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
-
- 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
- G01S7/288—Coherent receivers
-
- 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
- G01S7/35—Details of non-pulse systems
-
- 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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
-
- 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
- G01S7/288—Coherent receivers
- G01S7/2886—Coherent receivers using I/Q processing
-
- 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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/358—Receivers using I/Q processing
Abstract
Co-channel interference method and system are eliminated the invention discloses a kind of phase code, system includes emission system, reception system, wave generating unit with phase shift function, digital if receiver, signal processing unit and data gather computer and terminal, the described wave generating unit with phase shift function produces the transmitting pumping signal of out of phase in each transmitting, and export to emission system and through antenna to spatial emission, digital if receiver receives the echo-signal received from antenna and emitter is coupled back into the main ripple signal come, and be processed into zero intermediate frequency I/Q signal respectively through corresponding digital filter and export to signal processing unit, the two-way zero intermediate frequency I/Q data that signal processing unit receives digital intermediate frequency output carries out Coherent processing and signal quality threshold processing, result after processing is transferred to data gather computer and terminal carries out data acquisition.Problem of co-channel interference in weather radar detection can thoroughly be solved using the present invention.
Description
Technical field
The present invention relates to radar signal processing field, particularly a kind of phase code eliminates co-channel interference method and system.
Background technology
With the high speed development of Radar Technology, no matter in civil area or military domain, the deployment of radar is more and more,
Radar network composite is also gradually applied.Therefore the electromagnetic environment of radar work tends to be complicated, and electromagnetic compatibility problem becomes increasingly conspicuous, wherein
The problem of maximum faced is exactly co-channel interference, especially the interference between homotype radar, and the quantity of radar is more, distance
It is nearer, disturb more serious.In weather radar field of detecting, co-channel interference has had a strong impact on echo data quality, therefore why
Sample eliminates problem of co-channel interference and become increasingly conspicuous.
In terms of existing various elimination co-channel interference technologies and method are concentrated mainly on data processing, exist problems with and
Defect：
(1) co-channel interference eliminates not thorough, while normal echo-signal may be influenceed；
(2) processing method, which is concentrated mainly on, is handled output base data, it is impossible to basic from principle to eliminate dry with frequency
Disturb.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of phase code eliminate co-channel interference method and
System, transmitted waveform uses PE system, i.e., different phase informations are superimposed in each transmitted waveform, in signal transacting
Coherent processing is carried out during reception, realizes and eliminates co-channel interference.
The purpose of the present invention is achieved through the following technical solutions：A kind of phase code eliminates co-channel interference system,
It includes emission system and reception system, and it also includes the wave generating unit with phase shift function, digital if receiver, signal
Processing unit and data gather computer and terminal, the wave generating unit with phase shift function produce different in each transmitting
The transmitting pumping signal of phase, and export to emission system and through antenna to spatial emission, digital if receiver is received and come from
Echo-signal and emitter that antenna is received are coupled back into the main ripple signal come, and are processed into zero respectively through corresponding digital filter
Intermediate frequency I/Q signal is exported to signal processing unit, and the two-way zero intermediate frequency I/Q data that signal processing unit receives digital intermediate frequency output is entered
Row carries out Coherent processing and signal quality threshold processing, and the result after processing is transferred into data gather computer and terminal carries out data
Collection.
The transmitting pumping signal of described out of phase is superimposed different phases in each transmitting excitation signal waveforms
Information.
It also includes monitoring system, and monitoring system sends orientation/pitching corner brace signal to digital if receiver.
A kind of phase code eliminates the method that co-channel interference system eliminates co-channel interference, and it comprises the following steps：
S1, the wave generating unit with phase shift function produce the transmitting pumping signal offset with out of phase, and exported
To emission system and through antenna to spatial emission；
S2, digital if receiver receive the echo-signal received from antenna and emitter is coupled back into the main ripple letter come
Number, and be processed into zero intermediate frequency I/Q signal respectively through corresponding digital filter and export to signal processing unit；
The two-way zero intermediate frequency I/Q data that S3, signal processing unit receive digital intermediate frequency output carries out Coherent processing and letter
Number threshold processing；
When echo-signal and interference signal enter receiver simultaneously, n-th of exomonental signal is represented by formula
(1)：
In formula, Φn：N-th of transmitting pulse initial phase；
The machine radar echo signal；
Interference signal；
N：Overall noise, is white noise；
For a full coherent Weather radar system, in processing, echo sequence will be received and carry out Coherent processing, the process
It is represented by formula (2) and formula (3)；
Due to Φn1For being uniformly distributed for (- π, π), so the Section 2 in formula (2) and formula (3)
WithFor white noise, so as to reach the purpose of separation radar echo signal and interference signal；
WhereinIt is the phase noise that echo-signal is introduced,The phase noise introduced for interference signal
By Coherent processing, interference signal complete albefaction can further utilize signal quality thresholding logarithm into white noise
According to further processing and elimination, signal quality thresholding such as formula (4) is represented；
In formula, R (1) represents 1 rank auto-correlation, and R (0) represents 0 rank auto-correlation；
S4, output result.
The beneficial effects of the invention are as follows：Co-channel interference method and system, hair are eliminated the invention provides a kind of phase code
Ejected wave shape uses PE system, i.e., different phase informations are superimposed in each transmitted waveform, when signal transacting is received
Coherent processing is carried out, realizes and eliminates co-channel interference.
(1) problem of co-channel interference in weather radar detection can thoroughly be solved using the present invention；
(2) the other active and sourceless seism in weather radar detection can also be solved the problems, such as using the present invention.
Brief description of the drawings
Fig. 1 is that phase code eliminates the co-channel interference block diagram of system；
Fig. 2 is that phase code eliminates co-channel interference process chart；
Fig. 3 is background return original I/Q data phase information schematic diagram；
Fig. 4 is phase deviation schematic diagram after Coherent processing；
Fig. 5 is data spectrum schematic diagram before and after Coherent processing；
Fig. 6 is co-channel interference radar echo map；
Fig. 7 is that phase code eliminates co-channel interference reflectogram.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
As shown in figure 1, a kind of phase code eliminates co-channel interference system, it includes emission system and reception system, and it is also
Including the wave generating unit with phase shift function, digital if receiver, signal processing unit and data gather computer and terminal, institute
The wave generating unit with phase shift function stated produces the transmitting pumping signal of out of phase in each transmitting, and output is extremely sent out
Penetrate system and through antenna to spatial emission, digital if receiver receives the echo-signal received from antenna and emitter coupling
The main ripple signal returned, and be processed into zero intermediate frequency I/Q signal respectively through corresponding digital filter and export to signal processing unit,
The two-way zero intermediate frequency I/Q data that signal processing unit receives digital intermediate frequency output carries out Coherent processing and signal quality thresholding
Processing, is transferred to data gather computer by the result after processing and terminal carries out data acquisition.
Signal processing unit carries out coherent reception processing using the phase information of main ripple signal to echo-signal, realizes phase
Coding eliminates co-channel interference.Because needing radar complete machine to be operated in phase encoded patterns, it is necessary to which the waveform with phase shift function produces list
Member (as frequency is comprehensive) can output phase encoded excitation signal.
The transmitting pumping signal of described out of phase is superimposed different phases in each transmitting excitation signal waveforms
Information.
It also includes monitoring system, and monitoring system sends orientation/pitching corner brace signal to digital if receiver.
A kind of phase code eliminates the method that co-channel interference system eliminates co-channel interference, and it comprises the following steps：
S1, the wave generating unit with phase shift function produce the transmitting pumping signal offset with out of phase, and exported
To emission system and through antenna to spatial emission；
S2, digital if receiver receive the echo-signal received from antenna and emitter is coupled back into the main ripple letter come
Number, and be processed into zero intermediate frequency I/Q signal respectively through corresponding digital filter and export to signal processing unit；
The two-way zero intermediate frequency I/Q data that S3, signal processing unit receive digital intermediate frequency output carries out Coherent processing and letter
Number threshold processing；
When echo-signal and interference signal enter receiver simultaneously, n-th of exomonental signal is represented by formula
(1)：
In formula, Φn：N-th of transmitting pulse initial phase；
The machine radar echo signal；
Interference signal；
N：Overall noise, is white noise；
For a full coherent Weather radar system, in processing, echo sequence will be received and carry out Coherent processing, the process
It is represented by formula (2) and formula (3)；
Due to Φn1For being uniformly distributed for (- π, π), so the Section 2 in formula (2) and formula (3)
WithFor white noise, so as to reach the purpose of separation radar echo signal and interference signal；
WhereinIt is the phase noise that echo-signal is introduced,The phase noise introduced for interference signal
By Coherent processing, interference signal complete albefaction can further utilize signal quality thresholding logarithm into white noise
According to further processing and elimination, signal quality thresholding such as formula (4) is represented；
In formula, R (1) represents 1 rank auto-correlation, and R (0) represents 0 rank auto-correlation；
S4, output result.
Signal transacting is carried out using the elimination co-channel interference method of the present invention, complete signal processing flow is as shown in Figure 2.
Digital if receiver receives the echo-signal received from antenna and emitter is coupled back into the main ripple signal come, and
Zero intermediate frequency I/Q signal is processed into respectively through corresponding digital filter to export to signal processing unit, model processing unit is to interference
Radar signal carries out Coherent processing, while carrying out standard square processing, to interference radar signal construction whitener after having handled, i.e., certainly
Adaptive filter, is filtered, and then carries out Coherent processing to detection radar echo-signal, obtains removing returning after co-channel interference
Wave number evidence, then carries out threshold mass processing to the echo data, finally exports result.
Radar signal can be disturbed to verify that phase code eliminates co-channel interference method using strong background return signal imitation
To the albefaction degree of co-channel interference signal.Using a full coherent X-band Doppler radar, phase encoded patterns are operated in
Under to the background return signal acquisition I/Q data of fixed position, carry out analysis calculating and obtain initial data phase information, coherent
Frequency spectrum after reason before and after phase information and Coherent processing is respectively as shown in Fig. 3, Fig. 4 and Fig. 5.
Undressed background return original signal spectrum is a white noise as can be seen from Figure 5, so as to demonstrate phase
Position coding can make the complete albefaction of interference signal.Frequency spectrum after Coherent processing has then reacted background return characteristic well, that is, visits
Echo-signal is surveyed preferably to be recovered.Using phase coding method albefaction interference signal, co-channel interference can be achieved and eliminates.
The actual effect of co-channel interference is eliminated for checking random phase encoding, two X-bands put together (frequency is utilized
Rate is identical) Doppler radar, started shooting simultaneously using two radars, wherein a radar is as interference source, in addition
One radar signals processor switches different tupes, and eliminating co-channel interference to phase code has carried out actual detection processing
The analysis and checking of effect.
The normal boot-strap work simultaneously of the full coherent Doppler radar of two X-bands, it is interference radar to set wherein 1 radar,
Interference radar is operated in 1000Hz repetition mode of operations；Detection radar is operated in the dual frequency patterns of 1000Hz/750Hz, and work arteries and veins
Rush two radars of width identical.Now detection radar is influenceed by co-channel interference, and it is as shown in Figure 6 that it detects echo.Then it will visit
Survey radar operation mode and be changed to phase code elimination co-channel interference pattern, radar echo map is as shown in Figure 7.Comparison diagram 6 and Fig. 7
It can be seen that being eliminated in phase code under co-channel interference pattern, the elimination to co-channel interference is realized well.
Claims (4)
1. a kind of phase code eliminates co-channel interference system, it includes emission system and reception system, it is characterised in that：It is also wrapped
The wave generating unit with phase shift function, digital if receiver, signal processing unit and data gather computer and terminal are included, it is described
The wave generating unit with phase shift function the transmitting pumping signal of out of phase is produced in each transmitting, and export to launching
System and through antenna to spatial emission, digital if receiver receives the echo-signal received from antenna and emitter is coupled back into
The main ripple signal come, and be processed into zero intermediate frequency I/Q signal respectively through corresponding digital filter and export to signal processing unit, letter
The two-way zero intermediate frequency I/Q data that number processing unit receives digital intermediate frequency output is carried out at Coherent processing and signal quality thresholding
Reason, is transferred to data gather computer by the result after processing and terminal carries out data acquisition.
2. a kind of phase code according to claim 1 eliminates co-channel interference system, it is characterised in that：Described different phases
The transmitting pumping signal of position is superimposed different phase informations in each transmitting excitation signal waveforms.
3. a kind of phase code according to claim 1 eliminates co-channel interference system, it is characterised in that：It also includes monitoring
System, monitoring system sends orientation/pitching corner brace signal to digital if receiver.
4. a kind of phase code as described in any one in claim 1-3 eliminates co-channel interference system elimination co-channel interference
Method, it is characterised in that it comprises the following steps：
S1, the wave generating unit with phase shift function produce the transmitting pumping signal offset with out of phase, and output is extremely sent out
Penetrate system and through antenna to spatial emission；
S2, digital if receiver receive the echo-signal received from antenna and emitter is coupled back into the main ripple signal come, and
Zero intermediate frequency I/Q signal is processed into respectively through corresponding digital filter to export to signal processing unit；
The two-way zero intermediate frequency I/Q data that S3, signal processing unit receive digital intermediate frequency output carries out Coherent processing and signal gate
Limit processing；
When echo-signal and interference signal enter receiver simultaneously, n-th of exomonental signal is represented by formula (1)：
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In formula, Φn：N-th of transmitting pulse initial phase；
The machine radar echo signal；
Interference signal；
N：Overall noise, is white noise；
For a full coherent Weather radar system, in processing, echo sequence will be received and carry out Coherent processing, the process can table
It is shown as formula (2) and formula (3)；
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Due to Φn1For being uniformly distributed for (- π, π), so the Section 2 in formula (2) and formula (3)
WithFor white noise, so as to reach the purpose of separation radar echo signal and interference signal；
WhereinIt is the phase noise that echo-signal is introduced,The phase noise introduced for interference signal；
By Coherent processing, interference signal complete albefaction further can be entered into white noise using signal quality thresholding to data
The processing of one step and elimination, signal quality thresholding such as formula (4) are represented；
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In formula, R (1) represents 1 rank auto-correlation, and R (0) represents 0 rank auto-correlation；
S5, output result.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261851A (en) * | 2019-03-15 | 2019-09-20 | 中国科学院电子学研究所 | A method of full-polarization SAR is realized based on pulse code |
| CN110988807A (en) * | 2019-11-22 | 2020-04-10 | 北京未感科技有限公司 | Device, system and method for eliminating circuit spike interference |
| WO2021197065A1 (en) * | 2020-03-30 | 2021-10-07 | 华为技术有限公司 | Interference suppression method and detection device |
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| EP4119985A4 (en) * | 2020-03-30 | 2023-08-16 | Huawei Technologies Co., Ltd. | Interference suppression method and detection device |
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