CN107271967A - pulse coherent transponder co-channel interference processing system - Google Patents
pulse coherent transponder co-channel interference processing system Download PDFInfo
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- CN107271967A CN107271967A CN201611057684.4A CN201611057684A CN107271967A CN 107271967 A CN107271967 A CN 107271967A CN 201611057684 A CN201611057684 A CN 201611057684A CN 107271967 A CN107271967 A CN 107271967A
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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
- 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
- G01S7/292—Extracting wanted echo-signals
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Abstract
The present invention proposes a kind of co-channel interference processing system of pulse coherent transponder, can solve the problems, such as the self-excitation of pulse coherent transponder co-channel interference using the present invention, it is ensured that the job stability of answering machine.The technical scheme is that：Pulse reply machine antenna is received after radiofrequency signal, radiofrequency signal FRAdmission amplification module is entered by circulator, the signal is after amplification module filter and amplification of going through the motions, pass through microwave switch control again, radiofrequency signal and local oscillation signal mixing output intermediate-freuqncy signal after control, after intermediate-freuqncy signal is by the amplification of middle amplification module and detection, the A/D of digital circuit blocks is sent to gather, gather signal and store forwarding by digital delay line, the SECO of digital delay line is controlled by transmitting-receiving sequential control circuit, forward signal send D/A converters to export intermediate-freuqncy signal, intermediate-freuqncy signal is after launch channel module up-conversion, amplified by power amplifier module, signal F after amplificationTExported by circulator.The present invention solves the problems, such as the self-excitation of pulse transmit-receive cofrequency.
Description
Technical field
During the present invention is the pulse answering machine on pulse regime measuring system, the co-channel interference of pulse coherent transponder
Processing system.
Background technology
Monopulse radar is a kind of Precision tracking radar.The size of data error that measurement accuracy is typically exported with radar come
Represent.It often launches a pulse, and antenna can form several wave beams simultaneously, and the amplitude and phase of each wave beam echo-signal are entered
Row compares, and when target is located on antenna axis, the amplitude and phase of each wave beam echo-signal are equal, and signal difference is zero；Work as mesh
When mark is not on antenna axis, the amplitude and phase of each wave beam echo-signal produce signal difference, and driving antenna turns to target
Until antenna axis alignment target, just can so measure the angle of site and the azimuth of target, the signal sum received from each wave beam,
The distance of target can be measured, so as to realize the measurement and tracking to target.Its range-measurement system is in pulse precision instrumentation radar
In occupy very important status, its function be by the processing of radar return is obtained the measurement of radar radial distance with
Track, servo-drive system carries out space angle position tracking on this basis, and both constitute pulse precision tracking instrumentation radar
Fundamentals of Measurement.In terms of pulse refers to the number that individual pulse can extract the echo impulse that target angular position information is relied on
Information.And single-pulse measurement radar is then to belong to lobe method angle measurement simultaneously, it only needs to compare the same of each wave beam reception
Echo impulse, it becomes possible to obtain the full detail of target.But due to the observation and measurement to target have successional feature,
Radar is accomplished by continuously receiving the echo-signal of target and continuous transmitting pulse, is obtaining a series of target letter
After breath, these information can be carried out with the processing of science, so as to obtain the information to target with high precision and high fidelity.It is early
The pulse precision instrumentation radar ranging subsystem of phase is all an independent subsystem, and the target of tracking measurement is usually without miscellaneous
" pure target " (being high-altitude target) of wave interference.Face to face over the ground the complex electromagnetic environment such as noise jamming when, modern range finder
Need to handle skill in real time using the complicated high intensity such as correlative accumulation, clutter cancellation, CFAR detection, range vernier and broadband ranging
Art, the digital signal processing function of modern range finder is increasingly protruded, and is increasingly obscured with the boundary of signal transacting subsystem, two
Person's integral fusion design treatment will be developing direction.Pulse precision instrumentation radar range-measurement system is generally configured with following spy
Point ...:1) range measurement accuracy is high, and the range accuracy of radar is influenceed by many factors, and such as zero-range set constant is set, receiver is slow
Prolong, dynamic lag, answering machine caused by target motion are delayed, propagated error, thermal noise error, quantization error and timing jitter etc.
Deng.These errors can be divided into systematic error and random error, and systematic error refers to those measure of the change width with time of measuring
Degree size holding is constant or by the slowly varying error of certain rule, with predictability, before the amount of side or after measurement all
Appropriate check and correction can be carried out and part modification is carried out to technology；Random error refers to change its measuring amplitude size over time
Uncertain or fast-changing error, can not make prediction before this kind of error measure, modification, Zhi Nengtong can not be proofreaded after measurement
Cross certain methods to reduce this error, method typically is filtering technique.Systematic error mainly has axial system error, data to pass
Delivery system error, dynamic lag error and atmospheric propagation error.And random error is main as caused by thermal noise.Random error master
Have in measurement process, because target flashes the measurement noise caused, these noises mostly meet " white process " white Gaussian noise.
Systematic error is needed to be modified to eliminate, and random error can then be suppressed by smothing filtering.In radar system error,
The influence that usual axial system error and data-transmission system error are caused is larger.The mistake that radar occurs when being measured to angular coordinate
Difference is exactly angleonly tracking measurement error, and error source has three kinds, is tracking error, transformed error and propagated error respectively, causes
Consequence is that the antenna axis of radar deviates target angle, and shaft angle report is inaccurate, and these three error sources each contain respective system again
Error of uniting and random error.Distance precision tracking error can cause distance by radar ripple door or target gate pulse and target echo arteries and veins
The centre of form of punching deviates.The transformed error related to radar can cause the error reporting that the delay of Bo Men or gate pulse is formed, and
Have influence on the tracking error and propagated error relevant with target.
The radar target to be detected, typically body in motion, such as aerial aircraft, marine vessel ship ground
Vehicle etc..But various backgrounds, such as various atural objects, sexual intercourse, wave and the wire of release are frequently present of around target
Interference.These backgrounds are probably completely motionless, such as mountain and building or slowly moving, wave during if any wind
With wire interference, in general, its movement velocity is small far beyond target, and the echo that these backgrounds are produced is referred to as clutter or passive dry
Disturb.When clutter and Moving Target Return are shown on radarscope simultaneously, can make the observation of target becomes highly difficult.If
Target is in clutter background, and weak signal target is buried in strong clutter, particularly when strong clutter overloads reception system, finds target
It is very difficult.When target is not in clutter background, to tell Moving Target Return quickly in clutter in blocks and also be not easy.Such as
Fruit radar terminal uses automatic detection and data handling system, because the presence of a large amount of clutters can win chess terminal overload or need not
The capacity and complexity for the increase system wanted.Therefore, no matter from anti-interference or improvement radar tracking quality angle, selection
Moving Target Return and suppress the problem of fixed clutter background is all one critically important.Modern Radar Signal processing moving-target detection
(MTD) digital processing technology is generally used, by making to be digitized processing after A/D conversion to echo-signal, i.e., with a spy
Determine frequency clock signal driving, starting sample terminates until the repetition period at the repetition period to radar return, each clock
Cycle one range gate of correspondence.Signal processor according to Radar operation modes control instruction word can to the whole in the repetition period or
Partial distance gated data is handled.Analyzed from radar measurement accuracy, above-mentioned treatment mechanism has some defects:1) modern thunder
Up to frequently with linear FM signal, its signal video frequency envelope is bell after being handled through overmatching compression, at the peak of bell envelope
Position sampling then signal do not lose and other positions sampling then signal slightly have loss.If sample clock frequency is sufficiently high,
Sampling loss can be ignored, but thereby result in huge processing data amount and can not apply in engineering in practice.So side
There is the slightly damaged problem of signal to noise ratio in method.Modern Radar Signal processing moving-target detection (MTD) generally asks that repetition is joined using resident
Difference, echo-signal does not change repetition if falling the clear filter cell in FFT when some resident interior MTD processing, otherwise
Need to change repetition, control mode is generally according to [repetition l, repetition 2 ..., repetition circulates recursion successively.Using the above method,
Solve " blind speed " problem substantially in the case of aimed acceleration is little, the indivedual dwell period signals occurred once in a while fall in FFT
Non- clear filter cell situation do not influence measurement accuracy.The advantage of this method is not needing accurate target velocity to measure
Information, works when target velocity measurement is relatively difficult especially under Low SNR.Shortcoming is still to have resident repetition individually
Generation echo-signal falls in the non-clear filter conditions of FFT, can be by accurate measurements such as effective detections for pursuing each echo
It is required that then also needing to improve.
In the routine workflow of range-measurement system, range finder is when searching for target, and signal transacting subsystem is with ripple door
Center, is scanned in specified detection range, and sets a thresholding and secondary thresholding, accurate according to the Threshold detection of setting
Then find after target, range finder given by information such as distance value and effective marker of the detection unit away from center of tracking gate where target,
Range finder adjusts window position according to detection information, subsequently into wide gate tracking (i.e. Wide band track), after loop adjustment is stable,
Just it is transferred to narrow-band tracking.After range finder turns tracking, signal transacting subsystem is detected in the range of Bo Men to echo, and is carried
Range error is taken, closed loop filtering is carried out for range finder.If meeting detection criteria again during recall tracing, memory is removed
Tracking mark, switchs to normal tracking.During tracking, ranging need as needed carry out disappear it is fuzzy, keep away it is blind, answer inverse transform and
Multistation works ....
The problem of Radar cross-section redaction problem is one particularly significant in intricate, fast changing electromagnetic environment.For
The tracking measurement of whole task segment is completed, many is generally required and measures same target with frequency radar relay tracking.In order to increase
The redundancy of measurement, in real work, often using multistation working method, this just brings a problem, is exactly that multistation is same
Frequency is disturbed.During serious interference, easily radar lock on is caused to be lost.Co-channel interference refers to the carrier frequency and useful signal of garbage signal
Carrier frequency it is identical, and to interference that the receiver for receiving same frequency useful signal is caused.The task segment of usual each radar has intersection weight
Folded part, that is to say, that many radars occur in task process while tracking the situation of same target to realize measurement
The relay of data and redundancy.Because multistation radar is to be worked with frequency and share same set of answering machine, and answering machine is in synchronization
A trigger signal can only be responded, therefore when set radar trigger signal reaches answering machine simultaneously more, by only one of which signal quilt
Response, may cause other radars to lose target.Co-channel interference have become one of the normal tracking measurement of influence it is crucial because
Co-channel interference phenomenon during tracking is identified as principal risk by element, many pulse measuring and controlling equipments.But it is anti-with frequency
The mechanism of interference is not correspondingly improved but, mainly uses just set up Wei Menqu in front of the door in ripple at present, and door is defended by detection
Region interference signal simultaneously avoids co-channel interference with reference to phase shift.Because existing monopulse radar typically can not directly distinguish him and stand interference
Signal and our station coherent signal, therefore when response formula is tracked, it is necessary to aircraft carrier reflected signal position is detained
Except processing, and then cause Wei Men blind areas..Existing Cochannel interference mechanism can be produced due to problem of co-channel interference to tracking measurement process
Raw considerable influence, mainly uses to set up before ripple door at present and defends a detection zone to reduce the risk of co-channel interference.Keep away blind
Process causes co-channel interference to also have a kind of situation, and B stations radar does not track target, and now fashionable door does not work yet, and believes when B stands
Number from rear close to A stand normally track signal when, will slowly enter A station ripple door, cause error of measured data to increase.Due to
Radar cannot distinguish between him and stand interference signal and our station coherent signal, cause to defend a detection mistiming our station coherent reflection signal as
He is stood interference signal, or he for falling artificial satellite's door blind area interference signal of standing is considered our station coherent signal, so as to should not enter
Start phase shift action during row phase shift, and should carry out not starting correctly during phase shift.Therefore, radar cannot distinguish between signal coherent
Property is the root of problem.If radar can recognize that the signal in Wei Men regions is what our station was sent, then defend door blind
Area is also avoided the need for, so as to also just improve the reliability of Cochannel interference, this requires the transmitting pulse of each radar to have
" uniqueness " of itself.The situation that co-channel interference is frequently run onto when being same model radar near work, it causes radar in hair
Now set pulse coherent transponder and receive signal frequency as fR, emission signal frequency is fT, local frequency is fo, receiving intermediate frequency signal
Frequency is fIR, emission medium-frequency signal frequency is fIT。
Had according to the frequency relation design of pulse reply machine：
fR=fIR+fo (1)
fT=fIT+fo (2)
When requiring fR=fTWhen, (1) formula is equal with (2) formula, it is easy to derive fIR=fIT.It can be seen that, according to calculating, it is ensured that arteries and veins
Rush the coherent transponding characteristic of answering machine, it is only necessary to ensure the coherent transponding characteristic of intermediate-freuqncy signal, it is unrelated with local oscillation signal.
The strong co-channel interference of one's own side's radar is subjected to before unfriendly target, radar data reduction drastically declines, or even paralysis completely.
Suppression to co-channel interference at present, mainly finds out interference and true echo in terms of time domain, frequency domain, spatial domain and polarizing field
Difference, takes measures to be eliminated.
How problem of co-channel interference is solved, as the key problem for solving the design of pulse reply machine coherent transponding.Particularly
Transmission signal is after power amplification, and signal energy is larger, and reception channel can be directly entered inside pulse reply machine, causes arteries and veins
Rush answering machine spontaneous from receiving, self-excitation problem occur.Prior art is general using transmitting-receiving timesharing work to pulse reply machine self-excitation problem
The processing scheme of work.But the pulse reply machine of traditional analog system, employs the analog circuit scheme based on microwave switch, it is limited
In the isolation index of the analog circuits such as circulator, microwave switch, when transmission signal power is larger, reception still can be disturbed logical
Road, causes pulse reply machine to forward spontaneous pulse, and work occurs abnormal.
In summary, in monopulse radar measuring system, in order to ensure range resolution ratio, the ranging essence of measuring system
Degree, typically requires that the pulse width of pulse signal is more narrow better, and requires that pulse reply machine Forwarding Delay is stable；In order to ensure to survey
Fast precision, it is desirable to which the downstream signal carrier frequency of pulse reply machine forwarding is equal to radar upward signal carrier frequency and coherent, phase
When in coherent transponding ratio, pulse reply machine receiving and transmitting signal must take into consideration problem of co-channel interference with frequency in design.Meanwhile, by arteries and veins
After the coherent transponding processing for rushing answering machine, the stability of Forwarding Delay can be improved, the pulse power of forward signal is improved, so as to carry
The echo-signal quality that high earth station receives, the final operating distance and measurement accuracy for improving ground radar.
The content of the invention
In order to solve the receiving and transmitting signal problem of co-channel interference of pulse answering machine in pulse radar measuring system, improve anti-same
The reliability of frequency interference, it is ensured that pulse answering machine reliably working, it is to avoid self-excitation problem occurs in pulse answering machine, the present invention is carried
For a kind of simple and reliable, flexibility and the co-channel interference processing system of the pulse coherent transponder of autgmentability.
The above-mentioned purpose of the present invention can be reached by following measures.A kind of pulse coherent transponder co-channel interference processing
System, including：Circulator, reception signaling module, power amplifier module, launch channel module, local oscillator and digital circuit blocks, its feature
It is：Pulse reply machine is from receives frequency and radiofrequency signal F of the tranmitting frequency with frequencyRSignal mode is received by circulator feeding
Block is divided into two-way after amplification module amplification and detection in, sent into all the way with local oscillation signal mixing output intermediate-freuqncy signal, intermediate-freuqncy signal
Digital circuit blocks A/D collections are converted to data signal, and the data signal carries out time delay storage in FPGA circuitry, another
The pulse detection signal of Lu Jingzhong amplification modules output is in digital circuit blocks, by receiving and dispatching sequential control circuit with reference pulse
Forward position pulse be reference, delay forwarding control pulse, microwave switch pulse daley and power amplifier detection pulse are produced, programmable
The completely enclosed sequential processing for receiving signal is produced in gate array FPGA circuit, controls to examine the pulse received using pulse sequence
Ripple signal carries out SECO, and the detection reference pulse control delay storage circuit for producing regeneration realizes digital delay line, A/D numbers
Word signal acquisition signal stores forwarding by digital delay line, and forward signal send D/A converters, analog intermediate frequency is converted to through D/A
Signal, the analog if signal is sent into power amplifier module by launch channel module up-conversion and is amplified；Power amplifier module is in power amplifier
When detection pulse is high level, by the radiofrequency signal F after amplificationTPulse-modulated signal is exported by circulator.
The present invention has the advantages that compared to prior art：
It is simple and reliable.The present invention is filtered by the docking collection of letters number of field amplification module and put after pulse reply machine receives signal
Greatly, the signal after amplification carries out lower mixing with frequency mixer, and the intermediate-freuqncy signal that mixing is obtained is amplified detection by middle amplification module,
And send A/D converter to be sampled, data signal is converted to, the data signal carries out the delay of certain time in FPGA circuitry
Storage (time delay may be programmed), the signal after delay is converted to analog if signal by D/A, analog if signal warp
Cross after launch channel up-conversion, amplified by power amplifier module and exported.Designed by same frequency coherent transponding, simplify pulse reply machine
Channel design.
With flexibility and autgmentability.Pulse reply machine antenna of the present invention is received after radiofrequency signal, radiofrequency signal FRIt is logical
Cross circulator and enter admission amplification module, the signal is after amplification module filter and amplification of going through the motions, then by microwave switch control, after control
Radiofrequency signal and local oscillation signal mixing output intermediate-freuqncy signal, after intermediate-freuqncy signal is by the amplification of middle amplification module and detection, programmable gate
Array send the A/D of digital circuit blocks to gather by way of stored digital, and collection signal turns by digital delay line storage
Hair, forward signal send D/A converters to export intermediate-freuqncy signal, and intermediate-freuqncy signal passes through power amplifier after launch channel module up-conversion
Module is amplified, the signal F after amplificationTExported by circulator.Realize that the time delay of pulse reply machine may be programmed, enhancing pulse should
Answer flexibility and the autgmentability of machine.
Solve the problems, such as the self-excitation that pulse reply machine occurs.The present invention is on the analog circuit scheme basis based on microwave switch
On, increase the pulse sequence control based on digital circuit, realize the transmitting-receiving time-sharing work of pulse reply machine, i.e., when power amplifier works
When, the completely enclosed sequential processing for receiving signal is produced in programmable gate array FPGA circuit.In digital circuit blocks, receive
The pulse detection signal that amplification module is exported during sequential control circuit is received is sent out, and the method controlled using pulse sequence is to the signal
SECO is carried out, microwave switch pulse, delay forwarding control pulse and power amplifier detection pulse is produced, fundamentally thoroughly solves
The pulse reply machine of traditional analog system, using the analog circuit isolation index based on microwave switch, is limited to circulator,
When transmission signal power is compared with conference interference receiving channel, pulse reply machine is caused to forward spontaneous pulse, the self-excitation of co-channel interference, work
There is abnormal pulsers answering machine problem in work.The present invention is controlled by the pulse sequence of regeneration, shielded in reference signal due to
The self-excitation detection pulse that the interference of power amplifier transmission signal receives channel and produced, so as to efficiently solve the self-excitation of pulse transmit-receive cofrequency
Problem.
Brief description of the drawings
Invention is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the circuit theory schematic diagram of pulse coherent transponder co-channel interference processing system of the present invention.
Fig. 2 is the pulse sequence control oscillogram of Fig. 1 pulse coherent transponders.
Fig. 3 is the impulsive measurement principle schematic of pulse reply machine.
Embodiment
Refering to Fig. 1.In the examples below, a kind of pulse coherent transponder co-channel interference processing system, including：Annular
Device, reception signaling module, power amplifier module, launch channel module, local oscillator and digital circuit blocks.First, in order to ensure pulse should
The coherent transponding of machine is answered, pulse reply unit frequency relation is from receives frequency with tranmitting frequency with frequency, coherent transponding ratio.Meanwhile,
For the Miniaturization Design of answering machine, pulse reply machine receiving and transmitting signal uses single-conversion scheme, shares local oscillator.Pulse reply
Machine is from receives frequency and radiofrequency signal F of the tranmitting frequency with frequencyRSignaling module and local oscillation signal are received by circulator feeding
Mixing output intermediate-freuqncy signal, intermediate-freuqncy signal is divided into two-way after amplification module amplification and detection in, digital circuit blocks is sent into all the way
A/D collections are converted to data signal, and it is defeated that the data signal carries out amplification module in time delay storage, another road in FPGA circuitry
The pulse detection signal gone out is in digital circuit blocks, by receiving and dispatching sequential control circuit using the forward position pulse of reference pulse as ginseng
Examine, delay forwarding control pulse, microwave switch pulse daley and power amplifier detection pulse are produced, in programmable gate array FPGA circuit
It is middle to produce the completely enclosed sequential processing for receiving signal, control to carry out sequential to the pulse detection signal received using pulse sequence
Control, the detection reference pulse control delay storage circuit of regeneration realizes digital delay line, and A/D digital signal acquirings signal passes through
Digital delay line storage forwarding, forward signal send D/A converters, analog if signal is converted to through D/A, the output analog intermediate frequency
Signal is sent into power amplifier module by launch channel module up-conversion and is amplified；Power amplifier module is high level in power amplifier detection pulse
When, by the radiofrequency signal F after amplificationTPulse-modulated signal is exported by circulator.
If it is f that pulse coherent transponder, which receives signal frequency,R, emission signal frequency is fT, local frequency is fo, in reception
Frequency signal frequency is fIR, emission medium-frequency signal frequency is fIT°
Had according to the frequency relation design of pulse reply machine：
fR=fIR+fo (1)
fT=fIT+fo (2)
When requiring fR=fTWhen, (1) formula is equal with (2) formula, it is easy to derive fIR=fIT.It can be seen that, according to calculating, it is ensured that arteries and veins
Rush the coherent transponding characteristic of answering machine, it is only necessary to ensure the coherent transponding characteristic of intermediate-freuqncy signal, it is unrelated with local oscillation signal.
Receiving channel module includes：Field amplification module, microwave switch and frequency mixer in sequential series, frequency pulse reply machine antenna
Receive after radiofrequency signal, radiofrequency signal FRAdmission amplification module, radiofrequency signal F are entered by circulatorRThrough going through the motions, amplification module filtering is put
After big, the radiofrequency signal and local oscillation signal mixing output intermediate-freuqncy signal of output are controlled by microwave switch, intermediate-freuqncy signal is in
Amplification module amplifies with after detection, and the pulse detection signal that detection output is put in feeding transmitting-receiving sequential control circuit centering is carried out at regeneration
Reason, after the pulse signal is negated, negates pulsion phase and new benchmark detection pulse is obtained, with this with microwave switch pulse
The forward position pulse of reference pulse is reference, produces delay forwarding control pulse, and collection signal stores forwarding by digital delay line,
Forward signal exports intermediate-freuqncy signal by D/A converters.
Intermediate-freuqncy signal is amplified after launch channel module up-conversion by power amplifier module, the signal F after amplificationTBy
Circulator is exported.Meanwhile, in digital circuit blocks, the pulse detection letter that amplification module is exported during transmitting-receiving sequential control circuit is received
Number, and the method controlled using pulse sequence carries out SECO to the signal, produces microwave switch pulse, delay forwarding control
Pulse and power amplifier detection pulse.Microwave switch delivers to pulse the microwave switch control end for receiving channel module, when power amplifier work
When in time close receive channel.Transmitting-receiving sequential control circuit will postpone forwarding control pulse and send digital delay line, inside FPGA
Power amplifier module is delivered in programmed delays time, the power amplifier detection pulse that the delay forwarding control of pulse coherent transponder is produced, only
Have when power amplifier detection pulse is high level, power amplifier module just has pulse-modulated signal output.
According to Fig. 2 oscillograms, pulse detection signal is that the pulse width of middle amplification module detection output is the negative of 0.6us
Pulse signal.Microwave switch pulse is the control wave that control receives channel module microwave switch break-make, the control pulse
Signal is the positive pulse signal that pulse width is 35.7us, when the signal is high level, represents to receive channel off.Receive and dispatch sequential
After control circuit regenerative detection pulse negates the pulse detection signal that middle amplification module is exported, arteries and veins is negated with microwave switch pulse
Punching is with obtaining new benchmark detection pulse；The switching signal of control power amplifier work when power amplifier detects pulse, the signal is arteries and veins
The positive pulse that width is 3.3us is rushed, delay forwarding control pulse is the control for the delay forwarding precision for controlling pulse coherent transponder
Pulse processed, the pulse is the time between the positive pulse that pulsewidth is 0.6us, and the pulse front edge and pulse detection signal trailing edge
16.4us is set in the poor Forwarding Latency value for pulse reply machine, figure, the time can be by receiving and dispatching sequential control circuit
Software design patterns, can any programming Control.
Refering to Fig. 3.Monopulse radar measuring system by pulse radar earth station repeat its transmission upstream bursts modulated signal,
Carry-on pulse reply machine receives the signal coherent transponding and goes back to ground, and earth station measures the delay inequality of receiving and transmitting signal, you can
Calculate the radial distance for obtaining aircraft target；The load of the downstream pulses signal internal modulation of earth station's measurement pulse reply machine forwarding
Ripple signal Doppler frequency value, you can calculate the radial velocity for obtaining aircraft target.
If the pulse repetition period is T, pulse width Δ, propagation delay τ,
Then upstream bursts modulated signal：
S (t)=Ac (t) cos (2 π fot+θ)
Downstream pulses modulated signal：
S (t- τ)=Ac (t- τ) cos [2 π fo(t-τ)+θ]
Then have：
Target range：
Maximum probe target range：
Range resolution ratio：
WillDownstream pulses modulated signal is substituted into obtain：
Wherein, Doppler frequency
According to (3), (6) formula, measurable distance and velocity amplitude.(4), (5) formula are analyzed, it is known that：Launch pulse it is narrower, its away from
High Resolution is higher, and range accuracy is higher；Repetition period is longer, and maximum detectable range is bigger, but weight compounding period is bigger, its
The mean power of pulse is lower, in turn restrictive function distance.
Above-described is only the preferred embodiments of the present invention.It should be pointed out that coming for one of ordinary skill in the art
Say, under the premise without departing from the principles of the invention, several modifications and improvements can also be made, such as, from the description above can be with
Find out, the parameters such as pulse width, delay forwarding time are changed according to system use requirement, realize that different delays forwarding time requires
Pulse coherent transponder.These alterations and modifications should be regarded as belonging to protection scope of the present invention.
Claims (10)
1. kind of pulse coherent transponder co-channel interference processing system, including：Circulator, reception signaling module, power amplifier module, transmitting
Channel module, local oscillator and digital circuit blocks, it is characterised in that：Pulse reply machine is from receives frequency with tranmitting frequency with frequency
Radiofrequency signal FRReceived and put in signaling module and local oscillation signal mixing output intermediate-freuqncy signal, intermediate-freuqncy signal warp by circulator feeding
Module is amplified and is divided into two-way after detection, and digital circuit blocks A/D collections are sent into all the way and are converted to data signal, the data signal
Time delay storage is carried out in FPGA circuitry, the pulse detection signal of another Lu Jingzhong amplification modules output is in digital circuit blocks
In, by receiving and dispatching sequential control circuit using the forward position pulse of reference pulse as reference, produce delay forwarding control pulse, microwave and open
Pulse daley and power amplifier detection pulse are closed, is produced in programmable gate array FPGA circuit at the completely enclosed sequential for receiving signal
Reason, is controlled to carry out SECO to the pulse detection signal received using pulse sequence, produces the detection reference pulse control of regeneration
System delay storage circuit realizes digital delay line, and A/D digital signal acquirings signal stores forwarding, forwarding letter by digital delay line
Number D/A converters are sent, be converted to analog if signal through D/A, the analog if signal is sent by launch channel module up-conversion
Enter power amplifier module to be amplified；Power amplifier module is when power amplifier detection pulse is high level, by the radiofrequency signal F after amplificationTBy
Circulator exports pulse-modulated signal.
2. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Pulse reply machine frequency
Rate relation is from receives frequency with tranmitting frequency with frequency, coherent transponding ratio.
3. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Pulse reply machine is received
Signal and use single-conversion scheme, share local oscillator.
4. pulse coherent transponder co-channel interference processing system as claimed in claim 2, it is characterised in that：According to pulse reply
The frequency relation design of machine has：
fR=fIR+fo(1)
fT=fIT+fo(2)
When requiring fR=fTWhen, (1) formula is equal with (2) formula, fIR=fIT,
In formula, fRSignal frequency, f are received for pulse coherent transponderTFor emission signal frequency, foFor local frequency, fIRTo receive
IF signal frequency, fITFor emission medium-frequency signal frequency.
5. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Receive channel module
Including：Field amplification module, microwave switch and frequency mixer in sequential series, pulse reply machine antenna is received after radiofrequency signal, radio frequency
Signal FRAdmission amplification module, radiofrequency signal F are entered by circulatorRAfter amplification module filter and amplification of going through the motions, pass through microwave switch control
The radiofrequency signal of output and local oscillation signal mixing output intermediate-freuqncy signal, after intermediate-freuqncy signal is by the amplification of middle amplification module and detection, send
Enter to receive and dispatch the pulse detection signal progress regeneration treatment that detection output is put in sequential control circuit centering, the pulse signal is negated
Afterwards, with microwave switch pulse negate pulsion phase with, obtain new benchmark detection pulse, using the forward position pulse of the reference pulse as
With reference to generation delay forwarding control pulse, collection signal passes through digital delay line and stores forwarding, and forward signal is converted by D/A
Device exports intermediate-freuqncy signal.
6. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Microwave switch is by arteries and veins
The microwave switch control end for receiving channel module is delivered in punching, is closed in time when power amplifier works and is received channel.
7. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Receive and dispatch SECO
Circuit will postpone forwarding control pulse and send digital delay line, in FPGA inside programming time delays, by pulse coherent transponder
Power amplifier module is delivered in the power amplifier detection pulse that delay forwarding control is produced, only when power amplifier detection pulse is high level, power amplifier
Module just has pulse-modulated signal output.
8. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Pulse detection signal
The undersuing that the pulse width exported for middle amplification module detection is 0.6us.
9. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Microwave switch pulse
It is the control wave that control receives channel module microwave switch break-make, the control wave is that pulse width is 35.7us
Positive pulse signal, the signal be high level when, represent receive channel off.
10. pulse coherent transponder co-channel interference processing system as claimed in claim 1, it is characterised in that：Receive and dispatch sequential control
After circuit regenerative detection pulse processed negates the pulse detection signal that middle amplification module is exported, pulse is negated with microwave switch pulse
With obtaining new benchmark detection pulse；The switching signal of power amplifier detection Pulse Width Control power amplifier work, the switching signal is pulse
Width is 3.3us positive pulse, and delay forwarding control pulse is the control for the delay forwarding precision for controlling pulse coherent transponder
Pulse, this controls pulse to be the positive pulse that pulsewidth is 0.6us, and between the positive pulse forward position and pulse detection signal trailing edge
Time difference is the Forwarding Latency value of pulse reply machine.
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| CN112764015B (en) * | 2020-11-24 | 2024-05-28 | 海鹰企业集团有限责任公司 | Sonar target capable of dynamically responding and response method thereof |
| CN112748410B (en) * | 2020-12-21 | 2022-03-22 | 中国航天科工集团八五一一研究所 | Interference time sequence generation method based on FPGA repetition frequency tracker |
| CN112748410A (en) * | 2020-12-21 | 2021-05-04 | 中国航天科工集团八五一一研究所 | Interference time sequence generation method based on FPGA repetition frequency tracker |
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| CN114280557B (en) * | 2021-12-24 | 2024-06-07 | 中国航天科工集团八五一一研究所 | Method for realizing simultaneous receiving and transmitting of airborne electronic equipment based on frequency transformation |
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| CN115021766A (en) * | 2022-08-05 | 2022-09-06 | 北京理工大学 | Co-channel interference elimination device suitable for single antenna framework of circulator |
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