CN107271980B - A kind of segmented matched filter processing method of pair of interval modulated signal - Google Patents
A kind of segmented matched filter processing method of pair of interval modulated signal Download PDFInfo
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- CN107271980B CN107271980B CN201710579841.6A CN201710579841A CN107271980B CN 107271980 B CN107271980 B CN 107271980B CN 201710579841 A CN201710579841 A CN 201710579841A CN 107271980 B CN107271980 B CN 107271980B
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- 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
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Abstract
The present invention relates to a kind of segmented matched filter processing method to interval modulated signal, step 1: linear FM signal sampling generates interval modulated signal.Step 2: the partial matched filter of design interval modulated signal.Step 3: segmented matched filter processing is carried out to interval modulated signal, analyzes the target property of output signal.Step 4: optimal interval modulated signal segmented matched filter is realized.The beneficial effect comprise that first, decoy train of pulse self-interference caused by solving the problems, such as interval spectrum modulation signal discontinuously.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, only export true target signal, eliminate interference of the decoy train of pulse to Small object signal.
Description
Technical field
The invention belongs to radar signal processing fields, and in particular to the processing technique of radar interval modulated signal, especially
It is a kind of segmented matched filter processing method to interval modulated signal.
Background technique
The internal field radiant type emulation of radar system is to pass through various simulations in the internal field environment using microwave dark room as representative
Technology and theoretical method equivalent manners truly reappear the generation of practical 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 high, unique advantages such as 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 encounter and be hard to avoid
Difficult: since the distance in internal field is smaller, the blind range zone of radar is larger, and greater than the distance of target in internal field and 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
At the reception of echo.If wide bandwidth signals are divided into several segment signals when will be big, if that is, will be one big when wide bandwidth signals become
" interval " signal of dry section, applied in the internal field radiant type emulation of broadband signal, by transmitting and it is received alternately, life
Be divided into the interval modulated signal of multiple short pulses at long pulse, can effectively solve 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 to be modulated using the matched filter of long pulse to interval in the conventional thought handled interval modulated signal
Signal carries out matched filtering processing, still, will lead to matching output using long pulse matching and includes a series of decoy trains of pulse,
If there are Small objects around a biggish target, it will appear covering of the False Target Rate to Weak target signal, it is necessary to
Detection performance is improved by the signal processing and information sifting in later period, thus the scale of analogue system becomes larger, increased costs.Such as
Fruit directly can inhibit 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 processing.
Summary of the invention
The purpose of the present invention is to provide a kind of segmented matched filter processing methods to interval modulated signal, between inhibiting
The decoy train of pulse of modulated signal of having a rest output improves signal to the detectability of real goal.Mainly use matched filtering skill
Art proposes the segmented matched filter processing method to interval modulated signal.In order to achieve the above object, the skill that the present invention takes
Art scheme is as follows:
Step 1: linear FM signal sampling generates interval modulated signal.
The linear FM signal of certain bandwidth, pulsewidth and chirp rate is generated by signal generator first, then solid with the period
Fixed square waves are modulated it, generate interval modulated signal.
Step 2: the partial matched filter of design 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
Partial matched filter is realized in design.
Step 3: segmented matched filter processing is carried out to interval modulated signal, analyzes the target property of output signal.
The interval modulated signal of Different sampling period is handled by corresponding partial matched filter, analysis output
The target property of signal, and study and obtain the relationship in output signal between the size and square-wave cycle of decoy train of pulse.
Step 4: optimal interval modulated signal segmented matched filter is realized.
Relationship between the size and square-wave cycle of the decoy train of pulse according to obtained in step 3 adjusts square-wave signal
Period, repeat the interval modulated signal segmented matched filter processing that optimization is realized Step 1: two, three.
Beneficial effects of the present invention specifically include that
First, decoy train of pulse self-interference caused by solving the problems, such as interval spectrum modulation signal discontinuously.Interval is modulated
The matched filtering result of signal time domain representation be a series of train of pulse, segmented matched filter method proposed in this paper, according to
The period of its amplitude characteristic feedback regulation intermittent sampling exported simultaneously designs corresponding partial matched filter, to realize ideal
Matched filtering processing, only export true target signal, effectively solve the problems, such as decoy train of pulse self-interference；
Second, eliminate interference of the decoy train of pulse to Weak target signal.Interval modulated signal is matched using long pulse
The output of filter includes a series of decoy trains of pulse, therefore, when there are multiple targets of different strengths and weaknesses, 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, true target signal is only exported, eliminates interference of the decoy train of pulse to Small object signal.
Detailed description of the invention
Fig. 1 is the overview flow chart of the segmented matched filter processing of interval modulated signal.
Fig. 2 is that linear FM signal sampling generates 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.
Fig. 4 (a) be modulation period be 10-5The intermittency signal of s passes through the output figure of partial matched filter.
Fig. 4 (b) isIntermittency signal pass through partial matched filter output figure.
Fig. 5 is based on system design frame chart of the invention.
Fig. 6 is the present invention to optimal interval modulated signal segmented matched filter treatment effect exemplary diagram.
Specific embodiment
Currently, the present invention is only applicable to radar linear frequency-modulated signal, interval is adjusted to proposed by the invention in conjunction with attached drawing
The method of the segmented matched filter processing of signal processed is further explained.Fig. 1 is outline flowchart of the 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 1: linear FM signal sampling generates interval modulated signal.
It is B by signal generator generation bandwidth, the linear FM signal a (t) for the unit energy that pulsewidth is T, is with the period
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) are as follows: x (t)=a (t) p (t), process are as shown in Figure 2.Wherein, sampling pulse duration tsEqual to square wave
Burst periods TsHalf, it may be assumed that 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: the partial matched filter of design interval modulated signal.
When directly being handled with the matched filter of linear FM signal due to interval modulated signal, output includes a system
Not eliminable decoy train of pulse is arranged, so the present invention is directly negated to interval modulated signal time domain and to take conjugation to obtain new
Matched filter, expression formula h (t) meet h (t)=x*(- t), wherein t is time parameter, and x (t) is interval modulated signal table
Up to formula, because filter is discontinuous in the time domain at this time, 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, analyzes the target property of output signal.Specifically
The following steps are included:
Firstly, the interval modulated signal of Different sampling period is passed through respectively at corresponding partial matched filter
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 specifically study relationship between the two.
It is then, according to simulation result and available with signal convolution, Fourier transformation and Fourier inversion derivation,
The range value b of the n-th order decoy pulse of segmented matched filter outputnAre as follows:
From the above equation, we can see that bnIt is mechanical periodicity, the size of repetition period and the pulsewidth B of linear FM signal are directly proportional,
With square T of the bandwidth T of linear FM signal, square-wave cycles 2It is inversely proportional；And make all pulses in the presence of the minimum repetition period
Meet b at some point within the periodn=0, i.e., corresponding impulse amplitude all zero.
Third derives discovery and works asWhen (k is any nonnegative integer), the peak value of pulse b of all non-zeroth ordersn
It is 0, i.e. output can completely eliminate the influence of decoy train of pulse.
Step 4: optimal interval modulated signal segmented matched filter is realized.
The bandwidth B and pulsewidth T of linear FM signal are generated according to signal generator, are adjusted square-wave generator and are generated cycle Ts
MeetIt is best to be modulated generation to linear FM signal for the square waves of (k is any nonnegative integer)
Interval modulated signal and corresponding partial matched filter, carry out matched filtering processing output it is 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 of the interval modulated signal of the invention randomly selected to square-wave cycle
The effect exemplary diagram of reason.Emulate the square-wave cycle T of settingsRespectively 10-5S and
Fig. 6 is the effect exemplary diagram that the present invention realizes optimal interval modulated signal segmented matched filter processing.Emulation is real
In testing, setting square-wave cycle isI.e.Filter output at this time is that real goal pulse is believed
Number, decoy train of pulse is completely eliminated, and is avoided passing through later data processing to extract true target signal, is optimized at signal
The process of reason.
Claims (1)
1. a kind of segmented matched filter processing method to interval modulated signal, it is characterised in that: the method includes as follows
Step:
Step 1: linear FM signal sampling generates interval modulated signal
The linear FM signal of certain bandwidth, pulsewidth and chirp rate is generated by signal generator first, then fixed with the period
Square waves are modulated it, generate interval modulated signal；
Step 2: the partial matched filter of design 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, analyzes the target property of output signal
The interval modulated signal of Different sampling period is handled by corresponding partial matched filter, analyzes output signal
Target property, and study obtain the relationship in output signal between the size and square-wave cycle of decoy train of pulse；
Step 4: optimal interval modulated signal segmented matched filter is realized
Relationship between the size and square-wave cycle of the decoy train of pulse according to obtained in step 3, adjusts the week of square-wave signal
Phase, specifically: the range value b of the n-th order decoy pulse of segmented matched filter outputnAre as follows:
From the above equation, we can see that bnIt is mechanical periodicity, the size of the repetition period and pulsewidth B of linear FM signal is directly proportional and line
Square T of the bandwidth T of property FM signal, square-wave cycles 2It is inversely proportional；And make all pulses in week in the presence of the minimum repetition period
Meet b at some point in phasen=0, i.e., corresponding impulse amplitude all zero；
WhenWhen, the peak value of pulse b of all non-zeroth ordersnIt is 0, i.e. output can completely eliminate decoy pulse
The influence of string；Wherein k is any nonnegative integer；
Repeat the interval modulated signal segmented matched filter processing that optimization is realized Step 1: two, three.
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| 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 |
| CN108732558B (en) * | 2018-03-26 | 2021-08-24 | 东南大学 | Matched filtering calculation method based on copy signal segmentation |
| 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 |
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