CN107271980A - A kind of segmented matched filter processing method to interval modulated signal - Google Patents
A kind of segmented matched filter processing method to interval modulated signal Download PDFInfo
- Publication number
- CN107271980A CN107271980A CN201710579841.6A CN201710579841A CN107271980A CN 107271980 A CN107271980 A CN 107271980A CN 201710579841 A CN201710579841 A CN 201710579841A CN 107271980 A CN107271980 A CN 107271980A
- Authority
- CN
- China
- Prior art keywords
- signal
- matched filter
- modulated signal
- interval
- interval modulated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to a kind of segmented matched filter processing method to interval modulated signal, step one：Linear FM signal sampling generation interval modulated signal.Step 2：Design the partial matched filter of interval modulated signal.Step 3：Segmented matched filter processing is carried out to interval modulated signal, the target property of output signal is analyzed.Step 4：Realize optimal interval modulated signal segmented matched filter.Beneficial effects of the present invention include：First, solve the problems, such as the discontinuous caused decoy train of pulse self-interference of interval spectrum modulation signal.Second, eliminate interference of the decoy train of pulse to Weak target signal.The optimum of partial matched filter proposed by the present invention can completely inhibit decoy train of pulse, and only output real goal signal, eliminates interference of the decoy train of pulse to Small object signal.
Description
Technical field
The invention belongs to radar signal processing field, and in particular to the treatment technology of radar interval modulated signal, especially
It is a kind of segmented matched filter processing method to interval modulated signal.
Background technology
The internal field radiant type emulation of radar system is in the internal field environment using microwave dark room as representative, to pass through various simulations
Technology and theoretical method equivalent manners, truly reappear the generation of actual radar electromagnetic wave, radiation, propagation, target scattering, connect
All processes such as receipts, processing.For the emulation of outfield radiant type, radiant type emulation in internal field has good confidentiality, flexibility
The unique advantage such as high, repeatability is strong.Narrow-band Radar is emulated in internal field, true to nature can reappear radar under complex electromagnetic environment
Detection and tracking process.But, if should in this way to it is big when wide bandwidth radar emulate, can run into and be difficult to avoid
It is difficult：In small distance due to internal field, the blind range zone of radar is larger, and more than target in internal field and the distance of radar, this also anticipates
Taste the not yet complete battery has fired of transmitting pulse, and echo frontier has reached, for the radar of transceiver, it is difficult to complete
Into the reception of echo.If wide bandwidth signals are divided into some segment signals when will be big, if that is, will be one big when wide bandwidth signals become
" interval " signal of dry section, it is raw by launching and receiving alternately applied in the internal field radiant type emulation of broadband signal
Be divided into the interval modulated signal of multiple short pulses into long pulse, can effectively solve that place is limited, transmitting-receiving block with signal every
High problem is required from degree.The target echo method of impulse treatment of interval modulated signal under the conditions of research limited space, is to solve
The key technology of radar long pulse signal internal field radiant type emulation.
It is that interval is modulated using the matched filter of long pulse in the conventional thought handled interval modulated signal
Signal carries out matched filtering processing, still, using long pulse matching matching output can be caused to include a series of decoy trains of pulse,
If there is Small object around a larger target, covering of the False Target Rate to Weak target signal occurs, it is necessary to
Detection performance is improved by the signal transacting and information sifting in later stage, thus the scale of analogue system becomes big, cost increase.Such as
Fruit directly can suppress decoy train of pulse using matched filtering processing, then can simplify analogue system, effectively control cost.It is real
On border, the matched filter of long pulse relative to interval modulated signal in the presence of " mismatch ", can be according to interval modulated signal
Design more preferably matched filter, this provides possibility for the optimization of signal transacting.
The content of the invention
It is an object of the invention to provide a kind of segmented matched filter processing method to interval modulated signal, between suppression
The decoy train of pulse of modulated signal of having a rest output, improves detectability of the signal to real goal.It is main to use matched filtering skill
Art, it is proposed that to the segmented matched filter processing method of interval modulated signal.In order to achieve the above object, the skill that the present invention takes
Art scheme is as follows：
Step one：Linear FM signal sampling generation interval modulated signal.
The linear FM signal of certain bandwidth, pulsewidth and chirp rate is produced by signal generator first, then it is solid with the cycle
Fixed square waves are modulated to it, generate interval modulated signal.
Step 2：Design the partial matched filter of interval modulated signal.
According to the expression formula of interval modulated signal, time domain negates the expression formula that conjugation obtains partial matched filter, and
Partial matched filter is realized in design.
Step 3：Segmented matched filter processing is carried out to interval modulated signal, the target property of output signal is analyzed.
The interval modulated signal of Different sampling period is handled by corresponding partial matched filter, analysis output
The target property of signal, and research obtains the relation in output signal between the size and square-wave cycle of decoy train of pulse.
Step 4：Realize optimal interval modulated signal segmented matched filter.
According to the relation between the size and square-wave cycle of the decoy train of pulse obtained in step 3, square-wave signal is adjusted
Cycle, repeat step one, two, three, realize optimize interval modulated signal segmented matched filter processing.
Beneficial effects of the present invention mainly include：
First, solve the problems, such as the discontinuous caused decoy train of pulse self-interference of interval spectrum modulation signal.Interval is modulated
The matched filtering result of signal time domain representation be a series of train of pulse, set forth herein segmented matched filter method, according to
The cycle of its amplitude characteristic feedback regulation intermittent sampling exported simultaneously designs corresponding partial matched filter, so as to realize ideal
Matched filtering processing, only output real goal signal, effectively solve decoy train of pulse self-interference the problem of；
Second, eliminate interference of the decoy train of pulse to Weak target signal.Interval modulated signal is matched using long pulse
The output of wave filter includes a series of decoy trains of pulse, therefore, when in the presence of power different multiple targets, big echo signal
Decoy train of pulse can cover the actual signal of Weak target.The optimum energy of partial matched filter proposed by the present invention
Decoy train of pulse is completely inhibited, only output real goal signal, eliminates interference of the decoy train of pulse to Small object signal.
Brief description of the drawings
Fig. 1 is the overview flow chart of the segmented matched filter processing of interval modulated signal.
Fig. 2 is linear FM signal sampling generation interval modulated signal rough schematic.
Fig. 3 (a) is the spectrogram of interval modulated signal.
Fig. 3 (b) is partial matched filter spectrum structure figure.
It is 10 modulation period that Fig. 4 (a), which is,-5S intermittency signal passes through the output figure of partial matched filter.
Fig. 4 (b) isIntermittency signal pass through partial matched filter output figure.
Fig. 5 is the system design block diagram based on the present invention.
Fig. 6 is the present invention to optimal interval modulated signal segmented matched filter treatment effect exemplary plot.
Embodiment
At present, the present invention is only applicable to radar linear frequency-modulated signal, and interval is adjusted to proposed by the invention with reference to accompanying drawing
The method of the segmented matched filter processing of signal processed is further explained.Fig. 1 is the outline flowchart of the present invention, and Fig. 5 is to be based on
The system block diagram of method design proposed by the invention.Present invention relates particularly to following steps:
Step one：Linear FM signal sampling generation interval modulated signal.
Linear FM signal a (t) with a width of B, pulsewidth for T unit energy is produced by signal generator, is with the cycle
TsThe square-wave pulse string signal p (t) of unit amplitude linear FM signal is modulated as sampled signal, obtained interval
Modulated signal x (t) is：X (t)=a (t) p (t), process is as shown in Figure 2.Wherein, sampling pulse duration tsEqual to square wave
Burst periods TsHalf, i.e.,：2ts=Ts；Square waves cycle TsControl can be adjusted according to actual requirement,
To realize the optimal design of interval modulated signal and processing.
Step 2：Design the partial matched filter of interval modulated signal.
When directly being handled due to interval modulated signal with the matched filter of linear FM signal, output is comprising one
The not eliminable decoy train of pulse of row, so the present invention is directly negated to interval modulated signal time domain and to take conjugation to obtain new
Matched filter, its expression formula h (t) meets h (t)=x*(- t), wherein t are time parameter, and x (t) is interval modulated signal table
Up to formula, because now wave filter is discontinuous in time domain, referred to as partial matched filter.Interval modulated signal and segmentation
The spectrum structure of matched filter is respectively as shown in Fig. 3 (a), Fig. 3 (b).
Step 3：Segmented matched filter processing is carried out to interval modulated signal, the target property of output signal is analyzed.Specifically
Comprise the following steps：
First, the interval modulated signal of Different sampling period respectively by corresponding partial matched filter at
Reason, as a result as shown in Fig. 4 (a), Fig. 4 (b).By comparing the target property of output signal, find for the different sampling periods,
The range value of the decoy train of pulse of output signal is widely different, it is therefore desirable to the relation of specific research therebetween.
Then, derive and can obtain according to simulation result and utilization signal convolution, Fourier transformation and Fourier inversion,
The range value b of the n-th order decoy pulse of segmented matched filter outputnFor：
B is understood by above formulanIt is mechanical periodicity, the size of its repetition period is directly proportional to the pulsewidth B of linear FM signal,
Square T of bandwidth T, square-wave cycle with linear FM signals 2It is inversely proportional；And cause all pulses in the presence of the minimum repetition period
B is met at some point within the cyclen=0, i.e., corresponding impulse amplitude all zero.
3rd, derive and find to work asWhen (k is any nonnegative integer), the peak value of pulse b of all non-zeroth ordersn
It is 0, i.e. the influence of decoy train of pulse can be completely eliminated in output.
Step 4：Realize optimal interval modulated signal segmented matched filter.
The bandwidth B and pulsewidth T of linear FM signal are produced according to signal generator, regulation square-wave generator produces cycle Ts
MeetThe square waves of (k is any nonnegative integer), are modulated to linear FM signal and generate most preferably
Interval modulated signal and corresponding partial matched filter, the output for carrying out matched filtering processing are as shown in Figure 6.
Fig. 4 (a), Fig. 4 (b) and Fig. 6 are the simulating, verifyings carried out to the present invention.Two groups of emulation are respectively provided with linear frequency modulation letter
Number bandwidth B=5MHz, pulsewidth T=1.25 × 10-4s。
Fig. 4 (a), Fig. 4 (b) are at the segmented matched filter for the interval modulated signal that the present invention is randomly selected to square-wave cycle
The effect exemplary plot of reason.Emulate the square-wave cycle T setsRespectively 10-5S and
Fig. 6 is the effect exemplary plot that the present invention realizes optimal interval modulated signal segmented matched filter processing.Emulation is real
In testing, setting square-wave cycle isI.e.Now wave filter is output as real goal pulse signal,
Decoy train of pulse is completely eliminated, it is to avoid real goal signal is extracted by later data processing, signal transacting is optimized
Process.
Claims (1)
1. a kind of segmented matched filter processing method to interval modulated signal, it is characterised in that：Described method includes as follows
Step：
Step one：Linear FM signal sampling generation interval modulated signal
The linear FM signal of certain bandwidth, pulsewidth and chirp rate is produced by signal generator first, then fixed with the cycle
Square waves are modulated to it, generate interval modulated signal；
Step 2：Design the partial matched filter of interval modulated signal
According to the expression formula of interval modulated signal, time domain negates conjugation and obtains the expression formula of partial matched filter, and designs
Realize partial matched filter；
Step 3：Segmented matched filter processing is carried out to interval modulated signal, the target property of output signal is analyzed
The interval modulated signal of Different sampling period is handled by corresponding partial matched filter, output signal is analyzed
Target property, and study the relation in output signal between the size and square-wave cycle of decoy train of pulse of obtaining；
Step 4：Realize optimal interval modulated signal segmented matched filter
According to the relation between the size and square-wave cycle of the decoy train of pulse obtained in step 3, the week of square-wave signal is adjusted
Phase, repeat step one, two, three realizes the interval modulated signal segmented matched filter processing optimized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710579841.6A CN107271980B (en) | 2017-07-17 | 2017-07-17 | A kind of segmented matched filter processing method of pair of interval modulated signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710579841.6A CN107271980B (en) | 2017-07-17 | 2017-07-17 | A kind of segmented matched filter processing method of pair of interval modulated signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107271980A true CN107271980A (en) | 2017-10-20 |
| CN107271980B CN107271980B (en) | 2019-07-12 |
Family
ID=60072725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710579841.6A Active CN107271980B (en) | 2017-07-17 | 2017-07-17 | A kind of segmented matched filter processing method of pair of interval modulated signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107271980B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817478A (en) * | 2017-10-31 | 2018-03-20 | 中国人民解放军国防科技大学 | Asynchronous flicker angle deception jamming method based on phase modulation surface |
| CN108732558A (en) * | 2018-03-26 | 2018-11-02 | 东南大学 | A kind of matched filtering computational methods based on copy signal subsection |
| CN111294117A (en) * | 2019-11-26 | 2020-06-16 | 北京航天长征飞行器研究所 | Phase coding signal processing method, device and equipment |
| CN111294116A (en) * | 2019-11-26 | 2020-06-16 | 北京航天长征飞行器研究所 | Linear frequency modulation signal processing method, device and equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158739A (en) * | 2015-08-28 | 2015-12-16 | 上海无线电设备研究所 | Linear frequency modulation signal sidelobe suppression method based on all-phase processing |
| CN106597403A (en) * | 2016-11-29 | 2017-04-26 | 西安电子工程研究所 | High-velocity target coherent accumulation detection method based on piecewise compensation |
-
2017
- 2017-07-17 CN CN201710579841.6A patent/CN107271980B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158739A (en) * | 2015-08-28 | 2015-12-16 | 上海无线电设备研究所 | Linear frequency modulation signal sidelobe suppression method based on all-phase processing |
| CN106597403A (en) * | 2016-11-29 | 2017-04-26 | 西安电子工程研究所 | High-velocity target coherent accumulation detection method based on piecewise compensation |
Non-Patent Citations (4)
| Title |
|---|
| DEJUN FENG等: "Jamming Wideband Radar Using Interrupted-Sampling Repeater", 《IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS》 * |
| LETAO XU等: "Matched-filter properties of linear-frequency-modulation radar signal reflected from a phase-switched screen", 《IET RADAR, SONAR & NAVIGATION》 * |
| 刘业民等: "LMF-BC雷达信号的间歇采样转发干扰的研究", 《现代防御技术》 * |
| 潘小义等: "基于全脉冲分段转发的LFM 雷达干扰方法", 《国防科技大学学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817478A (en) * | 2017-10-31 | 2018-03-20 | 中国人民解放军国防科技大学 | Asynchronous flicker angle deception jamming method based on phase modulation surface |
| CN107817478B (en) * | 2017-10-31 | 2019-08-16 | 中国人民解放军国防科技大学 | Asynchronous flicker angle deception jamming method based on phase modulation surface |
| CN108732558A (en) * | 2018-03-26 | 2018-11-02 | 东南大学 | A kind of matched filtering computational methods based on copy signal subsection |
| CN108732558B (en) * | 2018-03-26 | 2021-08-24 | 东南大学 | Matched filtering calculation method based on copy signal segmentation |
| CN111294117A (en) * | 2019-11-26 | 2020-06-16 | 北京航天长征飞行器研究所 | Phase coding signal processing method, device and equipment |
| CN111294116A (en) * | 2019-11-26 | 2020-06-16 | 北京航天长征飞行器研究所 | Linear frequency modulation signal processing method, device and equipment |
| CN111294117B (en) * | 2019-11-26 | 2022-04-29 | 北京航天长征飞行器研究所 | Phase coding signal processing method, device and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107271980B (en) | 2019-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107271980B (en) | A kind of segmented matched filter processing method of pair of interval modulated signal | |
| CN105629207B (en) | Radar Signal Processing System and intensive target jamming production method based on DRFM technology | |
| Feng et al. | Jamming de-chirping radar using interrupted-sampling repeater | |
| CN107192991B (en) | A kind of radio-frequency radiation formula emulation wideband pulse radar imagery equivalent simulation method | |
| CN114594428B (en) | Intermittent sampling interference suppression method based on linear frequency modulation in pulse-to-pulse frequency coding | |
| CN112748403B (en) | Nonlinear frequency modulation pulse train waveform design method based on frequency spectrum modulation agility | |
| CN107346017B (en) | The intensive target simulation method of pulse compression radar based on frequency matching filtering | |
| CN107367717B (en) | Radar multi-target intermediate frequency simulation device | |
| CN112799023A (en) | Multi-false-target interference method for fast forwarding | |
| CN111507008B (en) | Parameterization-based general radar model modeling method | |
| CN113376601B (en) | Frequency agile radar sidelobe suppression method based on CLEAN algorithm | |
| CN112578350B (en) | Airborne SAR interference effect simulation method under high-energy microwave interference | |
| CN110618411B (en) | Airborne radar clutter real-time signal generation method | |
| CN114609596B (en) | Echo characteristic accurate control interference method and system based on intermittent sampling | |
| CN106249208A (en) | Signal detecting method under amplitude modulated jamming based on Fourier Transform of Fractional Order | |
| CN111123218A (en) | Track deception jamming system and method for airborne early warning PD radar | |
| CN106019243A (en) | Inter-pulse initial phase third-power modulation and FRFT (fractional Fourier transform)-based DRFM (digital radio frequency memory) interference detection and resisting method | |
| CN103267963B (en) | Multi-criterion radar emission signal design method based on phase modulation | |
| CN103744066A (en) | Optimizing method for digital orthogonal phase identifying and matched filtering | |
| Li et al. | A novel radar waveform design for anti-interrupted sampling repeater jamming via time-frequency random coded method | |
| CN103616670B (en) | Based on the SAR scatter-wave jamming method that floating platform improves | |
| CN111722198B (en) | Signal generation method and system combining radar detection and interference | |
| CN112014807A (en) | Self-adaptive clutter suppression method for frequency agile radar | |
| CN103885044B (en) | A kind of miscellaneous suppressing method of making an uproar of Narrow-band Radar echo based on CLEAN algorithm | |
| CN114358046B (en) | Multi-complexity-level complex electromagnetic interference environment simulation generation method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |