CN108594216A - A kind of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system and signal processing method - Google Patents
A kind of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system and signal processing method Download PDFInfo
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- CN108594216A CN108594216A CN201810347731.1A CN201810347731A CN108594216A CN 108594216 A CN108594216 A CN 108594216A CN 201810347731 A CN201810347731 A CN 201810347731A CN 108594216 A CN108594216 A CN 108594216A
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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
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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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
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/581—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse modulated waves and based upon the Doppler effect resulting from movement of targets
- G01S13/582—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse modulated waves and based upon the Doppler effect resulting from movement of targets adapted for simultaneous range and velocity measurements
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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
- G01S7/41—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
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system and signal processing method, detection system includes Constructing Chaotic Code generator, delayer, linear frequency modulation device, Solid Source, directional coupler, 0/ π phase converters, circulator, frequency mixer, low-noise amplifier, low-pass filter, signal processor, comparator and executive level.The present invention utilizes Constructing Chaotic Code phase modulation system signal very ideal range cutoff characteristic and speed resoluting force, it is low using linear FM signal peak power simultaneously, when wide bandwidth it is big, without blind range zone the advantages that, Constructing Chaotic Code phase modulation and linear frequency modulation is compound, the frequency spectrum of single signal can not only be changed, the interference free performance of increase system, the probability that is trapped of system can also be reduced, the precision to test the speed to object ranging is improved.
Description
Technical field
The present invention relates to a kind of radio fuse detection system and its signal processing method, especially a kind of Constructing Chaotic Code phase modulation
The signal processing method of linear frequency modulation compound detection system.
Background technology
Since the environment in the following high-tech electronic war is complicated and changeable, the developing goal of range-measurement system switchs in turn
Seek precipitous range cutoff characteristic and superior detection performance and good interference free performance.These performances quality with draw
The waveform modulated mode of letter is undivided, and replaces the modulation system of single waveform may make using the modulation system of composite wave-shape
Waveform is more complicated, and frequency bandwidth is wider.
Currently, the fuse compound detection system studied extensively had Pseudo-random Code Phase Modulation and main track frequency modulation compound detection system,
Pseudo-random Code Phase Modulation and PAM compound detection systems, Pseudo-random Code Phase Modulation and linear frequency modulation compound detection system etc..But common pseudo noise code
As modulated signal, Cipher Strength is low, and cycle length is limited, and correlation properties are not ideal.Also, in traditional pseudo-code tune
Mutually in linear frequency modulation compound detection system, be by sacrifice difference frequency signal asked to reduce the Doppler sensitivity of Pseudo-random Code Phase Modulation signal
Topic, this prevents difference frequency information from being used, and distance measuring method is single.
Invention content
The purpose of the present invention is to provide a kind of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system and signal processing method,
So that fuse detection system has ideal distance, speed resoluting force, possess superior detection performance and good anti-interference energy
Power.
Realize that the technical solution of the object of the invention is：A kind of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system, including it is mixed
Ignorant code generator, delayer, linear frequency modulation device, Solid Source, directional coupler, 0/ π phase converters, circulator, frequency mixer, low noise
Amplifier, low-pass filter, signal processor, comparator and executive level；
Signal processor generates sawtooth signal, is sawed after carrying out linear frequency modulation with the electromagnetic wave that microwave solid-state circuit generates
Tooth wave FM signal, as carrier signal；Constructing Chaotic Code generator generates Constructing Chaotic Code, by Constructing Chaotic Code and sawtooth wave linear FM signal
Phase modulation is carried out by 0/ π phase converters and obtains multiplex modulated signal, passes through aerial radiation to sky after directional coupler, circulator
Between in；After transmitting signal encounters moving target, portion of energy is reflected and is received antenna reception, after antenna receives signal
Detection system is inputted by circulator, is mixed, will be mixed defeated with sawtooth wave linear FM signal after being amplified by low noise
Go out signal and pass through low-pass filter, feeding signal processor obtains distance and velocity information after making pre-processing；Pass through thresholding ratio
After drive executive level, export enabling signal.
Further, the signal processor includes AD sampling modules, DA output modules, Constructing Chaotic Code correlation module, envelope
Extraction module, difference frequency range finder module and Doppler range rate measurement module；Wherein
AD sampling modules are for acquiring filtered amplified echo-signal；
DA output modules are for exporting sawtooth signal；
Constructing Chaotic Code correlation module be used for by echo-signal with local Constructing Chaotic Code it is related, obtain phase difference；And according to phase difference
The delay time for calculating echo-signal relative transmission signal, range information is calculated；
Envelope extract block is used to extract the envelope of echo-signal, obtains difference frequency signal；
Difference frequency range finder module is calculated for obtaining signal frequency as FFT to the difference frequency signal extracted according to beat frequency
Obtain range information；
Doppler range rate measurement module is used to extract the Doppler signal in difference frequency signal, measures Doppler frequency, is calculated
Velocity information.
A kind of signal processing method based on Constructing Chaotic Code phase modulation linear frequency modulation compound detection system, includes the following steps：
Step 1, AD acquires echo-signal, and DA exports sawtooth wave and lock-out pulse；
Step 2, related in the enabled lower progress Constructing Chaotic Code of lock-out pulse, export the phase of echo-signal relative local Constructing Chaotic Code
The range information of potential difference and target；
Step 3, according to phase difference, local Constructing Chaotic Code is deferred to same phase, be multiplied extraction envelope with echo-signal, obtains
To difference frequency；
Step 4, beat frequency is measured, output range information is calculated；
Step 5, lack sampling is carried out to difference frequency signal and obtains Doppler signal, measure Doppler frequency, calculate output speed
Information.
Compared with prior art, the present invention its remarkable advantage is：(1) utilizing has auto-correlation function like white noise, initial value
Sensibility is strong and confirmable Constructing Chaotic Code is as modulated signal, by the extremely strong Constructing Chaotic Code phase-modulated signal of anti-interference ability with when broadband
Roomy, ranging and range rate linear FM signal with high accuracy carries out compound so that transmitting signal have stronger anti-interference ability and
Ability of anti-interception；(2) ranging can be completed by Constructing Chaotic Code correlation or extraction difference frequency, makes full use of the chaos in echo-signal
Code information and difference frequency information, distance measuring method diversification.
Description of the drawings
Fig. 1 is the Constructing Chaotic Code phase modulation linear frequency modulation compound detection system functional block diagram of the present invention.
Fig. 2 is signal processor functional block diagram of the present invention.
Fig. 3 is the echo-signal oscillogram of detection system of the present invention.
Fig. 4 is the difference frequency signal oscillogram that the present invention extracts.
Fig. 5 is the range error of the invention obtained by Constructing Chaotic Code correlation method and time relationship oscillogram.
Fig. 6 is the present invention by measuring the range error and time relationship oscillogram that beat frequency obtains.
Fig. 7 is the present invention by measuring the velocity error and time relationship oscillogram that Doppler frequency obtains.
Specific implementation mode
In conjunction with Fig. 1, a kind of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system, including Constructing Chaotic Code generator, delayer, line
Property frequency modulator, Solid Source, directional coupler, 0/ π phase converters, circulator, frequency mixer, low-noise amplifier, low-pass filter, letter
Number processor, comparator and executive level；
Signal processor generates sawtooth signal, is sawed after carrying out linear frequency modulation with the electromagnetic wave that microwave solid-state circuit generates
Tooth wave FM signal, as carrier signal；
Constructing Chaotic Code generator generates Constructing Chaotic Code, and Constructing Chaotic Code and sawtooth wave linear FM signal are carried out by 0/ π phase converters
Phase modulation obtains multiplex modulated signal, by aerial radiation to space after directional coupler, circulator；
After transmitting signal encounters moving target, portion of energy is reflected and is received antenna reception, and antenna receives letter
Detection system is inputted by circulator after number, is mixed, will be mixed with sawtooth wave linear FM signal after being amplified by low noise
Frequency output signal passes through low-pass filter, and feeding signal processor obtains distance and velocity information after making pre-processing；Pass through door
Executive level is driven after limit, exports enabling signal.
As shown in Fig. 2, the signal processor includes AD sampling modules, DA output modules, Constructing Chaotic Code correlation module, envelope
Extraction module, difference frequency range finder module and Doppler range rate measurement module；Wherein
AD sampling modules are for acquiring filtered amplified echo-signal；
DA output modules are for exporting sawtooth signal；
Constructing Chaotic Code correlation module be used for by echo-signal with local Constructing Chaotic Code it is related, obtain phase difference；And according to phase difference
The delay time for calculating echo-signal relative transmission signal, range information is calculated；
Envelope extract block is used to extract the envelope of echo-signal, obtains difference frequency signal；
Difference frequency range finder module is calculated for obtaining signal frequency as FFT to the difference frequency signal extracted according to beat frequency
Obtain range information；
Doppler range rate measurement module is used to extract the Doppler signal in difference frequency signal, measures Doppler frequency, is calculated
Velocity information.
A kind of signal processing method based on the Constructing Chaotic Code phase modulation linear frequency modulation compound detection system, including following step
Suddenly：
(1) AD acquires echo-signal, and DA exports sawtooth wave and lock-out pulse；
(2) related in the enabled lower progress Constructing Chaotic Code of lock-out pulse, export the phase of echo-signal relative local Constructing Chaotic Code
The range information of difference and target；
For the echo-signal after mixing and filtering：
uI(t)=1/2ARs(t-τ)cos[2π(kτ2/2-ktτ-f0τ)]
Wherein, ARFor echo signal amplitude, s (t- τ) is the Constructing Chaotic Code sequence in echo-signal, and k is linear frequency modulation frequency,
τ is the delay time of echo-signal relative transmission signal, f0For carrier frequency.
Since the operating distance of fuse is generally several meters to tens meters, τ was tens to hundreds of nanoseconds, therefore the quadratic term of τ
It can ignore, the signal expression after normalized is：
Wherein, R0For initial distance of the detection system away from target, v is the speed of target movement, fdFor Doppler frequency.
Local Constructing Chaotic Code and its are subjected to relevant treatment, phase difference is obtained using FFT Circular correlation methods, and then be calculated
Delay time completes ranging.The output signal that correlation obtains is：
Wherein, T is associated period length, R (τ-τ0) be Constructing Chaotic Code auto-correlation function.
(3) according to phase difference, local Constructing Chaotic Code is deferred to same phase, be multiplied extraction envelope with echo-signal, obtains
Difference frequency；Specially：
According to the phase difference that Constructing Chaotic Code correlation obtains, local Constructing Chaotic Code is deferred to identical phase, with echo-signal phase
Multiply (it is all 1 that completely in phase two-way bipolarity Constructing Chaotic Code is worth after being multiplied), eliminates the Constructing Chaotic Code in echo-signal, extract difference frequency
Signal.
(4) beat frequency is measured, output range information is calculated；
The difference frequency signal extracted is：
Wherein, △ FMFor frequency modulation deviation, TMFor the frequency modulation period, c is the light velocity, and R is target range.
Include range information in beat frequency according to difference frequency signal formula.Therefore, distance can be by measuring difference frequency signal frequency
Rate is found out.In order to improve frequency-measurement accuracy, CZT algorithm zoom FFTs can be used and obtain more accurate frequency values.
(5) lack sampling is carried out to difference frequency signal and obtains Doppler signal, measure Doppler frequency, calculate output speed letter
Breath；Specially：
According to the difference frequency signal extracted, therefrom Doppler signal is extracted using lack sampling algorithm：
Wherein, f0For carrier frequency, v is target velocity.
Include velocity information in Doppler frequency according to Doppler signal formula.Therefore, speed can be by measuring Doppler
Signal frequency is found out.
With reference to embodiment and attached drawing, the present invention is described in detail.
Embodiment
(1) synchronous chaos code：Due to the aperiodicity of Constructing Chaotic Code, in the correlation process, the most important is just to maintain
Otherwise the synchronization of Constructing Chaotic Code will be unable to obtain the phase difference between echo-signal and local Constructing Chaotic Code by Constructing Chaotic Code correlation.Institute
A lock-out pulse is arranged, synchronization can be completed using lock-out pulse as the relevant enable signal of Constructing Chaotic Code.
(2) Constructing Chaotic Code is related：The phase difference of echo-signal and local signal is obtained by FFT Circular correlation methods, passes through phase
Potential difference it can be learnt that echo-signal relative transmission signal delay time, the distance of target can be calculated according to delay time.FFT
Circular correlation method is a kind of algorithm of time-domain parallel acquisition phase, actually completes convolution algorithm in time domain, is become using FFT
Convolution of changing commanders is transformed into frequency domain multiplication, can save operation time, can also save resource.
If two finite lengths are all the sequence x (n) and y (n) of N, corresponding Fourier transformation is respectively X (k) and Y
(k), that is, meet following correspondence：
The computing cross-correlation of x (n) and y (n) can be expressed as：
Wherein, z (n) is the cross-correlation function of x (n) and y (n).
Doing FFT transform to above formula can obtain：
Wherein, Z (k) is the corresponding Fourier variations of z (n), Y*(k) conjugate function for being Y (k).
By above-mentioned derivation it is found that the related operation of time domain can transform to the conjugate multiplication operation of frequency domain, such transformation
Arithmetic speed can be greatly improved, accurate phase difference is obtained.
(3) difference frequency signal is extracted：Because difference frequency signal expression formula is：
Wherein, △ FMFor frequency modulation deviation, TMFor the frequency modulation period, c is the light velocity, and R is target range.
The distance of target can so be calculated according to the frequency of difference frequency signal.Since echo-signal is a kind of amplitude modulation letter
Number, and difference frequency is modulated by Constructing Chaotic Code, so to extract difference frequency information from echo-signal, it is necessary to extract echo-signal
Envelope.The method for extracting envelope is as follows：
The phase difference between echo-signal and local Constructing Chaotic Code is obtained by Constructing Chaotic Code correlation first, then generate one with
The identical delay chaos code signal of chaos code phase in echo-signal.Since local delay Constructing Chaotic Code and echo-signal phase are complete
It coincide, and echo-signal and local code are all bipolar signals, delay code is multiplied with echo-signal can eliminate echo-signal
Internal Constructing Chaotic Code, to leave behind the envelope containing difference frequency information.The signal after multiplication is finally passed through into low-pass filter, filter
Noise wave removing, you can extract difference frequency signal.
(4) Doppler signal is extracted：Because Doppler signal expression formula is：
Wherein, f0For carrier frequency, v is target velocity.
The speed of target can so be calculated according to the frequency of Doppler signal.
Difference frequency signal expression formula is：
cos(△φ1)=cos2 π (△ FMfmτt+f0τ)
=cos2 π f0τcos2π△FMfmτt-sin2πf0τsin2π△FMfmτt
Wherein, f0For carrier frequency, τ is the delay time of echo-signal relative transmission signal, △ FMFor modulating bandwidth, fm
For modulation frequency.
By f0τ is expanded into：
f0τ=f02(R0- vt)/c=2f0R0/c-fdt
Wherein, R0For initial distance, v is the speed of target, and c is the light velocity, fdFor Doppler frequency.So can by above formula
Know, includes Doppler frequency in beat frequency.
According to difference frequency signal expression formula, two of signal by cos (2 π f0τ) and sin (2 π f0It τ) weights, first half is even
Function, Fourier space coefficient BnIt is zero, latter half is odd function, Fourier space coefficient AnIt is zero, then
Wherein, u0For chirp rate, n is harmonic component number.
In order to which expression formula writes convenient, order：
Then An=an cos(2πf0τ), Bn=bn sin(2πf0τ), A0=a0 cos(2πf0τ)
Fourier's trigonometrical number of difference frequency letter decomposes expression formula：
WithFrequency samples e (t), then
Wherein,The frequency of signal is much smaller than cos (2 π f0τ) the frequency of Doppler signal, therefore e (k) signals
Be byCos (the 2 π f of signal modulation0τ) Doppler signal.
It is derived according to above, lack sampling theorem can be by each harmonic nf in difference frequency signalmFrequency is mixed to zero-frequency, obtains
To the Doppler signal modulated by complicated low frequency signal.That is, Doppler can be extracted from difference frequency signal by lack sampling
Signal.
The present embodiment uses following systematic parameter：Symbol width T=50ns, frequency modulation cycle Tm=100us, frequency deviation △ F=
50MHz, target move distance 16m~12.5m, movement velocity 60m/s, difference frequency sample rate fs=100MHz.
As shown in Figure 1, the course of work of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system is as follows：Signal processor generates
Sawtooth signal obtains sawtooth phase modulation signal, as carrier wave after carrying out linear frequency modulation with the electromagnetic wave that microwave solid-state circuit generates
Signal.Constructing Chaotic Code generator generates Constructing Chaotic Code, and Constructing Chaotic Code and sawtooth wave linear FM signal are carried out phase modulation by 0/ π phase converters
Multiplex modulated signal is obtained, by aerial radiation to space after directional coupler, circulator.Fortune is encountered in transmitting signal
After moving-target, portion of energy is reflected and is received antenna reception.Antenna receives and inputs detection system by circulator after signal
System, is mixed after being amplified by low noise with sawtooth wave linear FM signal, and mixer output signal is passed through low-pass filter,
Feeding signal processor obtains distance and velocity information after making pre-processing.It is driven more afterwards by thresholding and executive level, output
Enabling signal.
As shown in Fig. 2, signal processing of the present invention includes the following steps：
(1) AD acquires echo-signal, and DA exports sawtooth wave and lock-out pulse.
(2) related in the enabled lower progress Constructing Chaotic Code of lock-out pulse, export the phase of echo-signal relative local Constructing Chaotic Code
The range information of difference and target.
(3) according to phase difference, local Constructing Chaotic Code is deferred to same phase, be multiplied extraction envelope with echo-signal, also
It is extraction difference frequency.
(4) beat frequency is measured, output range information is calculated.
(5) lack sampling is carried out to difference frequency signal and obtains Doppler signal, measure Doppler frequency, calculate output speed letter
Breath.
Fig. 3 is the echo-signal oscillogram of this compound detection system, and abscissa is target run duration, and ordinate is echo
The amplitude of signal.From the figure 3, it may be seen that echo-signal waveform is an amplitude-modulated signal, difference frequency signal is modulated by Constructing Chaotic Code, with echo
Signal formula uI(t)=1/2ARALs(t-τ)cos[2π(kτ2/2-ktτ-f0τ)] it is consistent.
Fig. 4 is the difference frequency signal waveform extracted from echo-signal, and abscissa is that coordinate is target run duration, indulges and sits
It is designated as the amplitude of difference frequency signal.As shown in Figure 4, difference frequency signal is essentially the sine wave signal of rule, and tundish contains irregularly
Region illustrates that difference frequency signal extracts successfully.
Fig. 5 is the relational graph of the range error and time that are measured by Constructing Chaotic Code correlation method, when abscissa is that target moves
Between, ordinate is range error.As shown in Figure 5, by Constructing Chaotic Code measurement of correlation distance, error is in -1.5m~2.5m, ranging base
This is accurate.
Fig. 6 is the relational graph by measuring range error and time that beat frequency obtains, when abscissa is that target moves
Between, ordinate is range error.It will be appreciated from fig. 6 that by beat frequency measurement distance, error is in -1.5m~1.5m, error relatively phase
Pass ranging is small, and ranging is more accurate.
Fig. 7 is the relational graph by measuring velocity error and time that Doppler frequency obtains, and abscissa moves for target
Time, ordinate are velocity error.As shown in Figure 7, by doppler frequency measurement speed, error tests the speed in -0.2344m/s
Error very little.
Claims (7)
1. a kind of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system, which is characterized in that including Constructing Chaotic Code generator, delayer,
Linear frequency modulation device, Solid Source, directional coupler, 0/ π phase converters, circulator, frequency mixer, low-noise amplifier, low-pass filter,
Signal processor, comparator and executive level；
Signal processor generates sawtooth signal, and sawtooth wave is obtained after carrying out linear frequency modulation with the electromagnetic wave that microwave solid-state circuit generates
FM signal, as carrier signal；Constructing Chaotic Code generator generates Constructing Chaotic Code, and Constructing Chaotic Code and sawtooth wave linear FM signal are passed through
0/ π phase converters carry out phase modulation and obtain multiplex modulated signal, pass through aerial radiation to space after directional coupler, circulator
In；After transmitting signal encounters moving target, portion of energy is reflected and is received antenna reception, and antenna leads to after receiving signal
Circulator input detection system is crossed, is mixed with sawtooth wave linear FM signal after being amplified by low noise, mixing is exported
Signal passes through low-pass filter, and feeding signal processor obtains distance and velocity information after making pre-processing；Compared by thresholding
After drive executive level, export enabling signal.
2. Constructing Chaotic Code phase modulation linear frequency modulation compound detection system according to claim 1, which is characterized in that at the signal
It includes AD sampling modules, DA output modules, Constructing Chaotic Code correlation module, envelope extract block, difference frequency range finder module and Duo Pu to manage device
Strangle speed measuring module；Wherein
AD sampling modules are for acquiring filtered amplified echo-signal；
DA output modules are for exporting sawtooth signal；
Constructing Chaotic Code correlation module be used for by echo-signal with local Constructing Chaotic Code it is related, obtain phase difference；And according to phase difference calculating
The delay time for going out echo-signal relative transmission signal, range information is calculated；
Envelope extract block is used to extract the envelope of echo-signal, obtains difference frequency signal；
Difference frequency range finder module calculates to obtain for obtaining signal frequency as FFT to the difference frequency signal extracted according to beat frequency
Range information；
Doppler range rate measurement module is used to extract the Doppler signal in difference frequency signal, measures Doppler frequency, speed is calculated
Information.
3. a kind of signal processing method based on Constructing Chaotic Code phase modulation linear frequency modulation compound detection system described in claim 2, special
Sign is, includes the following steps：
Step 1, AD acquires echo-signal, and DA exports sawtooth wave and lock-out pulse；
Step 2, related in the enabled lower progress Constructing Chaotic Code of lock-out pulse, export the phase difference of echo-signal relative local Constructing Chaotic Code
And the range information of target；
Step 3, according to phase difference, local Constructing Chaotic Code is deferred to same phase, be multiplied extraction envelope with echo-signal, obtains difference
Frequently；
Step 4, beat frequency is measured, output range information is calculated；
Step 5, lack sampling is carried out to difference frequency signal and obtains Doppler signal, measure Doppler frequency, calculate output speed information.
4. the signal processing method of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system according to claim 3, feature
It is, step 2 is specially：
For the echo-signal after mixing and filtering：
uI(t)=1/2ARs(t-τ)cos[2π(kτ2/2-ktτ-f0τ)]
Wherein, ARFor echo signal amplitude, s (t- τ) is the Constructing Chaotic Code sequence in echo-signal, and k is linear frequency modulation frequency, and τ is back
The delay time of wave signal relative transmission signal, f0For carrier frequency.
Ignore the quadratic term of τ, the signal expression after normalized is：
Wherein, R0For initial distance of the detection system away from target, v is the speed of target movement, fdFor Doppler frequency；
Local Constructing Chaotic Code and its are subjected to relevant treatment, phase difference is obtained using FFT Circular correlation methods, and then delay is calculated
Time completes ranging；The output signal that correlation obtains is：
Wherein, T is associated period length, R (τ-τ0) be Constructing Chaotic Code auto-correlation function.
5. the signal processing method of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system according to claim 3, feature
It is, step 3 is specially：
According to the phase difference that Constructing Chaotic Code correlation obtains, local Constructing Chaotic Code is deferred to identical phase, is multiplied with echo-signal, it is complete
It is all 1 to be worth after being multiplied entirely with the two-way bipolarity Constructing Chaotic Code of phase, eliminates the Constructing Chaotic Code in echo-signal, extracts difference frequency signal.
6. the signal processing method of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system according to claim 3, feature
It is, the difference frequency signal extracted in step 4 is：
Wherein, △ FMFor frequency modulation deviation, TMFor the frequency modulation period, c is the light velocity, and R is target range.
7. the signal processing method of Constructing Chaotic Code phase modulation linear frequency modulation compound detection system according to claim 3, feature
It is, step 5 is specially：
According to the difference frequency signal extracted, Doppler signal is extracted using lack sampling algorithm：
Wherein, f0For carrier frequency, v is target velocity；
Include velocity information in Doppler frequency according to Doppler signal formula, speed is found out by measuring Doppler signal frequency
Spend information.
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Cited By (3)
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|---|---|---|---|---|
| CN111323794A (en) * | 2020-03-21 | 2020-06-23 | 哈尔滨工程大学 | Periodic frequency modulation interference elimination method based on periodic resampling |
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