CN108717179A - Frequency diversity radar and method based on more waveform self-adaptive processings - Google Patents
Frequency diversity radar and method based on more waveform self-adaptive processings Download PDFInfo
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- CN108717179A CN108717179A CN201810181232.XA CN201810181232A CN108717179A CN 108717179 A CN108717179 A CN 108717179A CN 201810181232 A CN201810181232 A CN 201810181232A CN 108717179 A CN108717179 A CN 108717179A
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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Abstract
The invention belongs to radar system technical fields, disclose a kind of frequency diversity radar and method based on more waveform self-adaptive processings, it is the bandwidth of operation for increasing radar, generate and emit multiple radar working pulses on a different frequency, devise the applicable radar work schedule for including normal detection cycle and near region detection cycle, 2 interferer signal detections are added in entire radar processing procedure, for judging whether radar is interfered and rejects interference signal.After radar receives echo-signal, first time interferer signal detection is carried out, is filtered first, is extracted each road radar echo signal of different frequency, interference analysis then is carried out to each road echo-signal；When finding that component frequency is interfered, the signal being interfered is abandoned；The present invention can effectively overcome legacy frequencies diversity radar, radio frequency shielding radar working frequency points be relatively fixed, the disadvantage that operating mode is single, anti-interference ability is limited, can further promote the anti-interference ability of radar.
Description
Technical field
The invention belongs to radar system technical fields, are related to a kind of frequency diversity radar based on more waveform self-adaptive processings
And method.
Background technology
In modern high technology war, radar is vital information system equipment on battlefield, be mainly used for finding with
All kinds of Research on Target are tracked, equip situation information as aircraft provides high-tech battlefield, command system is real to the equipment of battlefield other side
Injection is hit.Afield, can radar work normally and provide in time the victory or defeat that effective information is often related to fight.Cause
This, radar becomes main on high-tech battlefield and is attacked and objects interfered.Include making an uproar to the major way that radar interferes in real time
The interference of acoustic pressure system, false target deceptive jamming and multi-false targets compacting interference etc..Jammer needs to scout before radar implements interference
Radar signal is analyzed, prior information is provided for interference.Therefore, the radar of conventionally employed single mode of operation is highly susceptible to do
It disturbs.
In order to promote the anti-interference ability of radar, especially anti-false target jamming profile ability, radar is commonly anti-interference at present
Method includes：Pulse etc. is screened using frequency diversity system, using radio frequency.
Frequency diversity technique is substantially a system with different carrier frequency concurrent workings, it passed through in a repetition period
Interior to emit several subpulses with different carrier frequency " simultaneously " or " timesharing ", signal frequency and the relationship of time are as shown in Figure 1；It is connecing
Time receiving, then the echo of multiple frequencies is carried out alignment addition processing through different receiving channels in signal processor.
Its running parameter of traditional frequency diversity radar is relatively fixed, and the signal processing of each Frequency point does not interfere with judgement
With interference removing function, and each Frequency point signal final process result needs summarize together, one of frequency by
To interference, whole system will be interfered, and the degree only interfered is weaker relative to single-frequency point radar, but still without
Method eliminates interference to the full extent.
The radar that function is screened with radio frequency emits the radio frequency shielding of other frequencies usually before working signal
Signal is used for deception jammer.If jammer is when receiving radio frequency shielding signal, it is believed that it is radar working signal, will
Radio frequency shielding signal is interfered；And radar is when signal processing, does not handle radio frequency shielding signal, and only processing work
Signal, therefore have the function of confusion jamming machine, eliminate interference.Radar signal schematic diagram such as Fig. 2 of function is screened with radio frequency
It is shown.
There is tradition the radar of radio frequency shielding function, operating mode to fix, such as：The pulse of front is radio frequency shielding letter
Number, subsequent pulse is radar working signal, f1-f2For fixed Δ f, operating mode is easier to disturbed machine identification, to
It is disturbed；The signal of radio frequency shielding simultaneously is not involved in target acquisition, and there is also the losses of signal energy.
Invention content
In order to improve the anti-interference ability of radar, the advantage of present invention combination frequency diversity and radio frequency shielding, it is proposed that one
Frequency diversity radar of the kind based on more waveform self-adaptive processings.When the radar works, within the same repetition period, emit multiple works
Make radar working pulse on a different frequency；It is received with processing in signal, isolates the echo-signal of different frequency first,
Then interferer signal detection function is introduced, determining interference is carried out to the echo-signal on different frequency, it is adaptive to reject by dry
The echo-signal for the frequency disturbed；It is disturbed situation according to what is detected simultaneously, it is adaptive to adjust Radar Signal Processing and other ginsengs
Number, promotes the Adaptive Anti-jamming ability of radar.
For achieving the above object, the present invention adopts the following technical scheme that：
A kind of frequency diversity radar based on more waveform self-adaptive processings, including：Antenna system, receives system at emission system
System, control and display system, the wave generator system that multiple signals can be generated, interferer signal detection system, Radar Signal Processing
System, radar data processing system, the antenna system are respectively by transmit-receive switch, frequency source and this vibrating system and transmitting
System, receive system be connected, receive system by interferer signal detection system respectively with control with display system, Radar Signal Processing
System is connected, and control is connected by that can generate the wave generator system of multiple signals with emission system with display system；Wherein control
System is connected with display system feedback end with frequency source with this vibrating system；Radar Signal Processing System passes through interferer signal detection system
It is connected with radar data processing system.
A kind of working method of the frequency diversity radar based on more waveform self-adaptive processings, its step are as follows：
1), radar system uses larger bandwidth of operation
Based on the frequency diversity radar of more waveform self-adaptive processings, need to be operated in difference comprising multiple in bandwidth of operation
Frequency signal, therefore its bandwidth of operation is significantly larger than general goals detection radar, the specific bandwidth of operation B of radar and each letter
Frequency interval number between bandwidth, each signal is related, usually there is following formula calculating：
In formula：BiIndicate the bandwidth of i-th of signal, Δ fjIndicate the difference on the frequency between+1 signal of jth and j-th of signal,
N indicates to emit the number of signal in the same repetition period；
In order to realize that the frequency diversity radar function based on more waveform self-adaptive processings, emission system and reception system need
Using the system with bandwidth of operation described in formula (1)；
2), using the wave generator system that can generate multiple signals
In each repetition period, in wave generator system, need to generate multiple separated multiple and different in the time domain
Radar intermediate frequency signal in frequency is sent to emission system and carries out up-conversion, power amplification and transmitting.It is produced in wave generator system
Raw radar intermediate frequency signal is indicated with following formula：
In formula：S (t) indicates the radar intermediate frequency signal that wave generator system generates, si(t) the multiple packet of i-th of signal is indicated
Network waveform, each signal are separated, bandwidth B in the time domaini, fiIndicate that the IF carrier of i-th of signal, N indicate work
Signal number；
3) interferer signal detection, is carried out
In radar system, increase interferer signal detection 1 between the system of reception and Radar Signal Processing System, in radar
Increase interferer signal detection 2 between signal processing system and data processing system, rejects interference signal for finding, improve radar
Anti-interference ability；
In interferer signal detection 1, according to working signal number N caused by system, N number of bandpass filter is designed, often
Frequency range of the bandpass range of a filter just for each signal, the echo-signal for receiving system output is filtered
Processing, by be filtered isolated from frequency each working signal for echo-signal sr1(t),sr2(t),…srN
(t), interference analysis then is carried out to the signal that every road is isolated, calculates the ginsengs such as averaged amplitude value and the amplitude intermediate value of each road signal
Number, it is compared with each parameter being not affected by under disturbance state, when parameters are significantly greater than not affected by interference, you can sentence
The roads Duan Zhe echo-signal receives interference, rejects in the signal processing.When each road echo is all interfered, each road echo-signal
All participate in subsequent signal processing；
In interferer signal detection 2, after Radar Signal Processing completes target detection, then an interference signal inspection is carried out
It surveys；The detection threshold and detection destination number for calculating radar, it are compared with each parameter being not affected by under disturbance state, respectively
When a parameter is significantly greater than not affected by interference, you can judge that radar receives interference, notice control is related to display system progress
Running parameter is changed；
Wherein radar work schedule
When radar is operated under adaptive frequency diversity mode, radar needs to emit the multiple letters for being operated in different frequency
Number, therefore the duration of signal transmitting is longer, it may appear that larger near region blind area；In order to ensure that radar is empty to far field and near region
The covering in domain designs two kinds of work periods in radar work：Normal detection cycle and near region detection cycle；Normally detecting
In period, the signal duration of transmitting is long, for improving detection range；In the detection cycle of near region, the signal of transmitting continues
Time is short, for reducing near region blind area；
In signal processing, detection range D can be set according to the transmitting signal length of normal detection cycle0,
Distance D0Near region detection cycle signal is inside only used, in distance D0Normal detection cycle signal is only used outside.What two kinds of periods occurred
There are two types of modes：Work period is alternately present to be occurred with work period sub-clustering, each in the working method of work period sub-clustering
The number of cycles N of cluster can be 8,16 etc., and concrete numerical value is required to determine by Radar Signal Processing；
In the detection cycle of near region, only emits a duration very short near region and mend blind vein punching, for short distance target
Detection,
In normal detection cycle, using adaptive frequency diversity technique, transmitting works in the radar signal of multiple frequencies
For the detection for medium and long distance；Multiple signals generate intermodulation intermodulation in power amplification in order to prevent, each signal when
It is separated on domain, the separated time span of signal is by default；
Wherein radar signal receives
After Radar Receiver System receives radar echo signal by antenna, by processing such as amplification, filtering, down coversions,
Echo-signal is transformed into intermediate-freuqncy signal；Reception system samples intermediate-freuqncy signal by signal acquisition process card, then leads to
It crosses Digital Signal Processing and sampled signal is converted into baseband digital I/Q signal, signal bandwidth is the bandwidth of operation of system, is supplied to
Subsequent interferer signal detection system 1 and Radar Signal Processing System etc. carry out subsequent processing；
Wherein interferer signal detection 1
The baseband digital I/Q signal that interferer signal detection 1 obtains reception system output is extracted each by being filtered
The signal of the echo-signal of working frequency, each working frequency is considered as 1 road signal, and carries out interference signal inspection to this echo-signal
It surveys；
According to working signal number N caused by system, N number of bandpass filter is designed, is used for the filter of interferer signal detection 1
Wave processing, extracts each road echo-signal；If the bandwidth of i-th of signal of radar is Bi, in receiving system output signal
Centre frequency is foi, then its for ideal filter be：
Filter carries out approximate processing during realization, according to the requirement of signal processing；
The specific method is as follows for Interference Detection in interferer signal detection 1：
When being not affected by interference, in radar normal operating conditions, the averaged amplitude value of each road echo-signal is calculatedWith
Amplitude intermediate valueParameter, and record and preserve in system database, and real-time update；
If since external high-intensity signal makes operation of receiver in saturation state, the signal amplitude of receiver output is
As, then given threshold beK in formula1、k2For threshold coefficient, 0 < k1,k2<
1, it is arranged according to detection event；
When radar works, the averaged amplitude value of each road signal of reception is calculatedWith amplitude intermediate valueParameter, by its point
Not and threshold valueCompare, whenOrWhen, you can judge that this road echo-signal receives interference；
When the echo-signal way being interfered is less than total echo-signal way, the echo-signal being interfered is abandoned,
Undisturbed signal is subjected to subsequent signal processing；When per echo-signal is all interfered all the way, all roads are returned
Wave signal all participates in subsequent signal processing；
Wherein Radar Signal Processing
In Radar Signal Processing, each road echo-signal exported after interferer signal detection is individually carried out at signal
Then reason integrates each road signal again, carry out target detection；Processing method is as follows：
Each road echo-signal carries out matched filtering processing, then precession object detection process；It is carrying out at moving-target detection
After reason, according to the reception processing time of signal, sequential relationship etc., each road signal is aligned in time；Then non-coherent is carried out
Multiple signals are synthesized 1 tunnel by accumulation；Signal after will build up on is sent into detector and carries out target detection；
Wherein interferer signal detection 2
Interferer signal detection 2 is after Radar Signal Processing completes target detection, then carries out an Interference Detection, and purposes is promoted
The anti-interference ability of system, the specific method is as follows：
When being not affected by interference, in radar normal operating conditions, the detection threshold of radar is calculatedWith detection number of targets
AmountEtc. parameters, and record and preserve in system database, and real-time update；
Given threshold isK in formula3、k4For threshold coefficient, k3,k4> 1, sets according to detection event
It sets；
When radar works, the detection threshold T of radar is calculatedwWith detection destination number Nw, by its respectively with threshold value
Compare；
WhenAndWhen, you can judgement radar is not affected by severe jamming or is not interfered, and works normally；
WhenOrWhen, you can judge that radar integrally receives severe jamming；
After detecting that radar is heavily disturbed, you can the working frequency of notice control and display system change radar,
The relevant operating parameters such as work schedule, to hide the interference of interference signal.
Due to using technical solution as described above, the present invention that there is following superiority：
A kind of frequency diversity radar and method based on more waveform self-adaptive processings mainly increase the work band of radar
Width generates and emits multiple radar working pulses on a different frequency, and devise it is applicable include normal detection cycle and
The radar work schedule of near region detection cycle, and 2 interferer signal detections are added in entire radar processing procedure, for sentencing
Whether disconnected radar is interfered and rejects interference signal.After radar receives echo-signal, first time interferer signal detection is carried out,
It is filtered first, extracts each road radar echo signal of different frequency, then each road echo-signal is interfered
Analysis；When finding that component frequency is interfered, the signal being interfered is abandoned；When finding that whole frequencies are all interfered,
It merges all frequencies and carries out signal processing.After target detection, second of interferer signal detection is carried out, target detection thresholding is passed through
Judge whether radar is interfered with detection destination number；If it find that radar nevertheless suffers from severe jamming, notice is controlled and is shown
Show the relevant operating parameters such as working frequency, the work schedule of system change radar, to hide the interference of interference signal.Energy of the present invention
Enough effectively overcoming legacy frequencies diversity radar, radio frequency to screen, radar working frequency points are relatively fixed, operating mode is single, anti-interference
The limited disadvantage of ability can further promote the anti-interference ability of radar.
The functions such as this vibrating system, transmit-receive switch and the antenna system of present system structure and implementation method and conventional radar
It is identical；The difference is that：(1) increase radar bandwidth of operation, emission system and reception system can emit and receive big instantaneous
The working signal of bandwidth；(2) using the wave generator systems of multiple signals can be generated, it can flexibly generate and multiple be operated in difference
The radar signal of Frequency point；(3) there is interferer signal detection system, detection radar to be interfered situation, sentence for carrying out interference
Certainly, interfered signal is rejected, and adaptive signal processing is carried out by control system control radar signal processing system.
Description of the drawings
Fig. 1 is the relational graph of signal frequency and time；
Fig. 2 is that radio frequency screens radar signal schematic diagram；
Fig. 3 is the frequency diversity radar illustrative view of functional configuration based on more waveform self-adaptive processings；
Fig. 4 is the frequency diversity radar work schedule schematic diagram based on more waveform self-adaptive processings；
Fig. 5 is near region detection cycle work schedule schematic diagram；
Fig. 6 is normal detection cycle work schedule schematic diagram；
Fig. 7 is 1 operating diagram of interferer signal detection；
Fig. 8 is signal processing operating diagram.
Specific implementation mode
In order to promote the anti-interference ability of radar, it is proposed that the frequency diversity radar based on more waveform self-adaptive processings,
Major function system structure is as shown in figure 3, including control and display system, the wave generator system that can generate multiple signals, hair
Penetrate system, reception system, interferer signal detection system, Radar Signal Processing System, radar data processing system, frequency source and sheet
Vibrating system, transmit-receive switch and antenna system etc..
In frequency diversity radar based on more waveform self-adaptive processings shown in Fig. 3, radar data processing system, frequency
The functions such as source and this vibrating system, transmit-receive switch and antenna system and implementation method are identical as conventional radar；The difference is that：
(1) increase radar bandwidth of operation, emission system and reception system can emit and receive the working signal of big instant bandwidth；(2)
Using the wave generator system that can generate multiple signals, multiple radar signals for being operated in different frequency point can be flexibly generated；
(3) there is interferer signal detection system, detection radar to be interfered situation, for carrying out interference judgement, reject interfered signal,
And adaptive signal processing is carried out by control system control radar signal processing system.
A kind of working method of the frequency diversity radar based on more waveform self-adaptive processings, its step are as follows：
1, radar system uses larger bandwidth of operation
Based on the frequency diversity radar of more waveform self-adaptive processings, need to be operated in difference comprising multiple in bandwidth of operation
Frequency signal, therefore its bandwidth of operation is significantly larger than general goals detection radar, the specific bandwidth of operation B of radar and each letter
Frequency interval number between bandwidth, each signal is related, can usually there is following formula calculating：
In formula：BiIndicate the bandwidth of i-th of signal, Δ fjIndicate the difference on the frequency between+1 signal of jth and j-th of signal,
N indicates to emit the number of signal in the same repetition period.
In order to realize that the frequency diversity radar function based on more waveform self-adaptive processings, emission system and reception system need
Using the system with bandwidth of operation described in formula (1).
2, using the wave generator system that can generate multiple signals
In each repetition period, in wave generator system, need to generate multiple separated multiple and different in the time domain
Radar intermediate frequency signal in frequency is sent to emission system and carries out up-conversion, power amplification and transmitting.It is produced in wave generator system
Raw radar intermediate frequency signal can be indicated with following formula：
In formula：S (t) indicates the radar intermediate frequency signal that wave generator system generates, si(t) the multiple packet of i-th of signal is indicated
Network waveform, each signal are separated, bandwidth B in the time domaini, fiIndicate that the IF carrier of i-th of signal, N indicate work
Signal number.
3, interferer signal detection is carried out
In radar system, increase interferer signal detection 1 between the system of reception and Radar Signal Processing System, in radar
Increase interferer signal detection 2 between signal processing system and data processing system, rejects interference signal for finding, improve radar
Anti-interference ability.
In interferer signal detection 1, according to working signal number N caused by system, N number of bandpass filter is designed, often
Frequency range of the bandpass range of a filter just for each signal, the echo-signal for receiving system output is filtered
Processing, by be filtered isolated from frequency each working signal for echo-signal sr1(t),sr2(t),…srN
(t), interference analysis then is carried out to the signal that every road is isolated, calculates the ginsengs such as averaged amplitude value and the amplitude intermediate value of each road signal
Number, it is compared with each parameter being not affected by under disturbance state, when parameters are significantly greater than not affected by interference, you can sentence
The roads Duan Zhe echo-signal receives interference, rejects in the signal processing.When each road echo is all interfered, each road echo-signal
All participate in subsequent signal processing.
In interferer signal detection 2, after Radar Signal Processing completes target detection, then an interference signal inspection is carried out
It surveys.The detection threshold and detection destination number for calculating radar, it are compared with each parameter being not affected by under disturbance state, respectively
When a parameter is significantly greater than not affected by interference, you can judge that radar receives interference, notice control is related to display system progress
Running parameter is changed.
Wherein radar work schedule
When radar is operated under adaptive frequency diversity mode, radar needs to emit the multiple letters for being operated in different frequency
Number, therefore the duration of signal transmitting is longer, it may appear that larger near region blind area.In order to ensure that radar is empty to far field and near region
The covering in domain designs two kinds of work periods in radar work：Normal detection cycle and near region detection cycle.Normally detecting
In period, the signal duration of transmitting is long, for improving detection range；In the detection cycle of near region, the signal of transmitting continues
Time is short, for reducing near region blind area.In signal processing, can according to the transmitting signal length of normal detection cycle,
Set detection range D0, in distance D0Near region detection cycle signal is inside only used, in distance D0Normal detection cycle letter is only used outside
Number.There are two types of the modes that two kinds of periods occur：Work period is alternately present to be occurred with work period sub-clustering, as shown in Figure 4.In work
In the working method for making period sub-clustering, the number of cycles N per cluster can be 8,16 etc., and concrete numerical value is wanted by Radar Signal Processing
Ask determining.
In the detection cycle of near region, only emits a duration very short near region and mend blind vein punching, for short distance target
Detection, as shown in Figure 5.
In normal detection cycle, using adaptive frequency diversity technique, transmitting works in the radar signal of multiple frequencies,
It is mainly useful for the detection of medium and long distance.Multiple signals generate intermodulation intermodulation, each signal in power amplification in order to prevent
It separates in the time domain, the separated time span of signal is by default.Normal detection cycle time diagram is as shown in Figure 6.
Wherein radar signal receives
After Radar Receiver System receives radar echo signal by antenna, by processing such as amplification, filtering, down coversions,
Echo-signal is transformed into intermediate-freuqncy signal.Reception system samples intermediate-freuqncy signal by signal acquisition process card, then leads to
It crosses Digital Signal Processing and sampled signal is converted into baseband digital I/Q signal, signal bandwidth is the bandwidth of operation of system, is supplied to
Subsequent interferer signal detection system 1 and Radar Signal Processing System etc. carry out subsequent processing.
Wherein interferer signal detection 1
The baseband digital I/Q signal that interferer signal detection 1 obtains reception system output is extracted each by being filtered
The signal of the echo-signal of working frequency, each working frequency is considered as 1 road signal, and carries out interference signal inspection to this echo-signal
It surveys, whole process is as shown in Figure 7.
According to working signal number N caused by system, N number of bandpass filter is designed, is used for the filter of interferer signal detection 1
Wave processing, extracts each road echo-signal.If the bandwidth of i-th of signal of radar is Bi, in receiving system output signal
Centre frequency is foi, then its for ideal filter be：
Filter can carry out approximate processing during realization according to the requirement of signal processing.
The specific method is as follows for Interference Detection in interferer signal detection 1：
(1) when being not affected by interference, in radar normal operating conditions, the averaged amplitude value of each road echo-signal is calculated
With amplitude intermediate valueEtc. parameters, and record and preserve in system database, and real-time update.
(2) it sets since external high-intensity signal makes operation of receiver in saturation state, the signal amplitude of receiver output
For As, then given threshold beK in formula1、k2For threshold coefficient, 0 < k1,k2
< 1, is arranged according to detection event.
(3) when radar works, the averaged amplitude value of each road signal of reception is calculatedWith amplitude intermediate valueEtc. parameters, will
Its respectively with threshold valueCompare, whenOrWhen, you can judge that this road echo-signal receives interference.
(4) when the echo-signal way being interfered is less than total echo-signal way, the echo letter being interfered is abandoned
Number, undisturbed signal is subjected to subsequent signal processing；When per echo-signal is all interfered all the way, by all roads
Echo-signal all participates in subsequent signal processing.
Wherein Radar Signal Processing
In Radar Signal Processing, each road echo-signal exported after interferer signal detection is individually carried out at signal
Then reason integrates each road signal again, carry out target detection, and whole process is as shown in Figure 8.
Processing method is as follows：
(1) each road echo-signal carries out matched filtering processing, then precession object detection process.
(2) after carrying out moving-target detection process, according to the reception processing time of signal, sequential relationship etc., each road is believed
It number is aligned in time；Then non-inherent accumulation is carried out, multiple signals are synthesized into 1 tunnel.
(3) signal after will build up on is sent into detector and carries out target detection.
Wherein interferer signal detection 2
Interferer signal detection 2 is after Radar Signal Processing completes target detection, then carries out an Interference Detection, and purposes is promoted
The anti-interference ability of system.The specific method is as follows：
(1) when being not affected by interference, in radar normal operating conditions, the detection threshold of radar is calculatedWith detection target
QuantityEtc. parameters, and record and preserve in system database, and real-time update.
(2) given threshold isK in formula3、k4For threshold coefficient, k3,k4> 1, according to detection event
Setting.
(3) when radar works, the detection threshold T of radar is calculatedwWith detection destination number Nw, by its respectively with threshold valueCompare.WhenAndWhen, you can judgement radar is not affected by severe jamming or is not interfered, Ke Yizheng
Often work；WhenOrWhen, you can judge that radar integrally receives severe jamming.
After detecting that radar is heavily disturbed, you can the working frequency of notice control and display system change radar,
The relevant operating parameters such as work schedule, to hide the interference of interference signal.
Claims (2)
1. a kind of frequency diversity radar based on more waveform self-adaptive processings, it is characterized in that：Including：Antenna system, emission system,
Reception system, control and display system, the wave generator system that multiple signals can be generated, interferer signal detection system, radar letter
Number processing system, radar data processing system, the antenna system pass through transmit-receive switch, frequency source and this vibrating system and hair respectively
Penetrate system, reception system be connected, receive system by interferer signal detection system respectively with control with display system, radar signal
Processing system is connected, and control is connected by that can generate the wave generator system of multiple signals with emission system with display system；Its
Middle control is connected with display system feedback end with frequency source with this vibrating system；Radar Signal Processing System passes through interferer signal detection
System is connected with radar data processing system.
2. a kind of working method of the frequency diversity radar based on more waveform self-adaptive processings, it is characterized in that：Its step are as follows：
1), radar system uses larger bandwidth of operation
Based on the frequency diversity radar of more waveform self-adaptive processings, need to be operated in different frequency comprising multiple in bandwidth of operation
Signal, therefore its bandwidth of operation is significantly larger than general goals detection radar, the specific bandwidth of operation B of radar and each signal band
Frequency interval between wide, each signal is related, usually there is following formula calculating：
In formula：BiIndicate the bandwidth of i-th of signal, Δ fjIndicate the difference on the frequency between+1 signal of jth and j-th of signal, N tables
Show the number for emitting signal in the same repetition period；
In order to realize that the frequency diversity radar function based on more waveform self-adaptive processings, emission system and reception system need to use
System with bandwidth of operation described in formula (1)；
2), using the wave generator system that can generate multiple signals
In each repetition period, in wave generator system, need to generate multiple separated multiple and different frequencies in the time domain
On radar intermediate frequency signal, be sent to emission system and carry out up-conversion, power amplification and transmitting, generated in wave generator system
Radar intermediate frequency signal is indicated with following formula：
In formula：S (t) indicates the radar intermediate frequency signal that wave generator system generates, si(t) the complex envelope wave of i-th of signal is indicated
Shape, each signal are separated, bandwidth B in the time domaini, fiIndicate that the IF carrier of i-th of signal, N indicate working signal
Number；
3) interferer signal detection, is carried out
In radar system, increase interferer signal detection 1 between the system of reception and Radar Signal Processing System, in radar signal
Increase interferer signal detection 2 between processing system and data processing system, rejects interference signal for finding, it is anti-dry to improve radar
Disturb ability；
In interferer signal detection 1, according to working signal number N caused by system, N number of bandpass filter is designed, it is each to filter
The echo-signal for receiving system output is filtered place by frequency range of the bandpass range of wave device just for each signal
Reason, by be filtered isolated from frequency each working signal for echo-signal sr1(t),sr2(t),…srN(t),
Then interference analysis is carried out to the signal that every road is isolated, calculates the parameters such as averaged amplitude value and the amplitude intermediate value of each road signal,
It is compared with each parameter being not affected by under disturbance state, when parameters are significantly greater than not affected by interference, you can judge
This road echo-signal receives interference, rejects in the signal processing, and when each road echo is all interfered, each road echo-signal is all
Participate in subsequent signal processing；
In interferer signal detection 2, after Radar Signal Processing completes target detection, then an interferer signal detection is carried out；Meter
The detection threshold and detection destination number for calculating radar, it are compared with each parameter being not affected by under disturbance state, Ge Gecan
When number is significantly greater than not affected by interference, you can judge that radar receives interference, notice control carries out related work with display system
Parameter is changed；
Wherein radar work schedule
When radar is operated under adaptive frequency diversity mode, radar needs to emit the multiple signals for being operated in different frequency,
Therefore the duration of signal transmitting is longer, it may appear that larger near region blind area；In order to ensure radar to far field and near region spatial domain
Covering, radar work in, design two kinds of work periods：Normal detection cycle and near region detection cycle；In normal detection week
Interim, the signal duration of transmitting is long, for improving detection range；In the detection cycle of near region, when the signal of transmitting continues
Between it is short, for reducing near region blind area；
In signal processing, detection range D can be set according to the transmitting signal length of normal detection cycle0, in distance
D0Near region detection cycle signal is inside only used, in distance D0Normal detection cycle signal, the mode that two kinds of periods occur are only used outside
There are two types of：Work period is alternately present to be occurred with work period sub-clustering, in the working method of work period sub-clustering, per cluster
Number of cycles N can be 8,16 etc., and concrete numerical value is required to determine by Radar Signal Processing；
In the detection cycle of near region, only emits a duration very short near region and mend blind vein punching, for the spy to short distance target
It surveys,
In normal detection cycle, using adaptive frequency diversity technique, the radar signal that transmitting works in multiple frequencies is used for
Detection for medium and long distance；Multiple signals generate intermodulation intermodulation in power amplification in order to prevent, and each signal is in the time domain
It separates, the separated time span of signal is by default；
Wherein radar signal receives
After Radar Receiver System receives radar echo signal by antenna, by processing such as amplification, filtering, down coversions, it will return
Wave signal is transformed into intermediate-freuqncy signal；Reception system samples intermediate-freuqncy signal by signal acquisition process card, then passes through number
Sampled signal is converted into baseband digital I/Q signal by word signal processing, and signal bandwidth is the bandwidth of operation of system, is supplied to below
Interferer signal detection system 1 and Radar Signal Processing System etc. carry out subsequent processing；
Wherein interferer signal detection 1
The baseband digital I/Q signal that interferer signal detection 1 obtains reception system output extracts each work by being filtered
The signal of the echo-signal of frequency, each working frequency is considered as 1 road signal, and carries out interferer signal detection to this echo-signal；
According to working signal number N caused by system, N number of bandpass filter is designed, at the filtering of interferer signal detection 1
Reason, extracts each road echo-signal；If the bandwidth of i-th of signal of radar is Bi, the center in receiving system output signal
Frequency is foi, then its for ideal filter be：
Filter carries out approximate processing during realization, according to the requirement of signal processing；
The specific method is as follows for Interference Detection in interferer signal detection 1：
When being not affected by interference, in radar normal operating conditions, the averaged amplitude value of each road echo-signal is calculatedIn amplitude
ValueParameter, and record and preserve in system database, and real-time update；
If since external high-intensity signal makes operation of receiver in saturation state, the signal amplitude of receiver output is As, then set
Determining threshold value isK in formula1、k2For threshold coefficient, 0 < k1,k2< 1, according to spy
Survey situation setting；
When radar works, the averaged amplitude value of each road signal of reception is calculatedWith amplitude intermediate valueParameter, by its respectively with
Threshold valueCompare, whenOrWhen, you can judge that this road echo-signal receives interference；
When the echo-signal way being interfered is less than total echo-signal way, the echo-signal being interfered is abandoned, it will not
The signal being disturbed carries out subsequent signal processing；When per echo-signal is all interfered all the way, all road echoes are believed
Number all participate in subsequent signal processing；
Wherein Radar Signal Processing
In Radar Signal Processing, each road echo-signal exported after interferer signal detection is individually subjected to signal processing,
Then each road signal is integrated again, carries out target detection；Processing method is as follows：
Each road echo-signal carries out matched filtering processing, then precession object detection process；After carrying out moving-target detection process,
According to the reception processing time of signal, sequential relationship etc., each road signal is aligned in time；Then non-inherent accumulation is carried out,
Multiple signals are synthesized into 1 tunnel；Signal after will build up on is sent into detector and carries out target detection；
Wherein interferer signal detection 2
Interferer signal detection 2 is after Radar Signal Processing completes target detection, then carries out an Interference Detection, purposes lifting system
Anti-interference ability, the specific method is as follows：
When being not affected by interference, in radar normal operating conditions, the detection threshold of radar is calculatedWith detection destination numberDeng
Parameter, and record and preserve in system database, and real-time update；
Given threshold isK in formula3、k4For threshold coefficient, k3,k4> 1, is arranged according to detection event；
When radar works, the detection threshold T of radar is calculatedwWith detection destination number Nw, by its respectively with threshold valueThan
Compared with；
WhenAndWhen, you can judgement radar is not affected by severe jamming or is not interfered, and works normally；WhenOrWhen, you can judge that radar integrally receives severe jamming；
After detecting that radar is heavily disturbed, you can the working frequency of radar, work are changed in notice control with display system
The relevant operating parameters such as sequential, to hide the interference of interference signal.
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