CN101089655A - Synthetic aperture radar system using chaos signal - Google Patents
Synthetic aperture radar system using chaos signal Download PDFInfo
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- CN101089655A CN101089655A CN 200610012244 CN200610012244A CN101089655A CN 101089655 A CN101089655 A CN 101089655A CN 200610012244 CN200610012244 CN 200610012244 CN 200610012244 A CN200610012244 A CN 200610012244A CN 101089655 A CN101089655 A CN 101089655A
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Abstract
A synthetic aperture radar system using chaos signal comprises base band chaos signal generator, orthogonal modulator, the first and the second intermediate band-pass filter and amplifier, the first and the second mixer, power amplifier, low noise amplifier, coherent rectifier, A/D converter, data recorder, imaging processor, timer, frequency source, duplexer and antenna for easily clearing off noise signal and raising width of mapping belt.
Description
Technical field
The invention belongs to polarization sensitive synthetic aperture radar system, particularly use the polarization sensitive synthetic aperture radar system of nonlinear frequency modulation signal, noise signal and chaotic signal.
Background technology
Traditional synthetic aperture radar (SAR) distance to high resolving power carry out pulse pressure by linear FM signal (LFM) and obtain, but the LFM signal is not easy to realize the prompt change of waveform, owing to when using synthetic-aperture radar, must send a plurality of radar signal p (t), the enemy army can train its adaptive signal processor to obtain the estimation of p (t) preferably according to these signals, estimate in order to resist sort signal, can when each pulse of emission, change radar signal p (t) with fascination enemy army receiving radar, pulse diversity technique that Here it is.Each moment of random noise signal is all uncorrelated, itself has just possessed the characteristic of pulse diversity, has been used to the interference free performance that improves radar in the synthetic-aperture radar.Noise signal has nonrepeatability, though have higher interference free performance, has also brought the difficulty of handling simultaneously.
Constantly expand and deeply, increasing observation mission has proposed more harsh requirement to the performance index of synthetic-aperture radar (SAR) satellite along with the research of synthetic-aperture radar application, for example, battlefield investigation, disaster are monitored, environmental monitoring or the like.These application not only require Synthetic Aperture Radar satellite to have certain resolution, also require it can realize continual observation is carried out in large tracts of land fixed point zone, but this has just proposed challenge at aspects such as coverage cycle, mapping bandwidth, radar observation Danone power to old mentality of designing.
Summary of the invention
The objective of the invention is to solve that noise signal does not have repeatability in the above-mentioned technology, need the real time record transmitted waveform or time-delay is done in transmitted waveform, increased system complexity, the problem of noise signal difficult treatment, in order to realize described purpose, the invention provides a kind of survey and draw bandwidth or resolution height, easily handle noise signal, use the polarization sensitive synthetic aperture radar system of chaotic signal.
In order to realize above-mentioned purpose, a kind of polarization sensitive synthetic aperture radar system that uses chaotic signal of the present invention comprises base band chaos signal generator, quadrature modulator, first if bandpas filter and amplifier, first frequency mixer, power amplifier, low noise amplifier, second frequency mixer, second if bandpas filter and amplifier, coherent detector, analog to digital converter, data recorder, imaging processor, timer, frequency source, diplexer and antenna;
Base band chaos signal generator output two-way base band chaotic signal, the first via base band chaotic signal two-way quadrature component of base band chaos signal generator output is connected with two input ends of quadrature modulator, quadrature modulator is with the intermediate frequency f of described first via base band chaotic signal orthogonal modulation to frequency source output
oOn, quadrature modulator output intermediate frequency chaotic signal; Quadrature modulator, first if bandpas filter and amplifier, first frequency mixer, power amplifier are connected in series successively, the input end of diplexer is connected with the power amplifier output terminal, first if bandpas filter and amplifier, described intermediate frequency chaotic signal is carried out filtering and power amplification, first frequency mixer is with the carrier frequency f of intermediate frequency chaotic signal and frequency source output
cCarry out mixing and change into radiofrequency signal, power amplifier carries out power amplification with the radiofrequency signal after the mixing and feeds diplexer, and diplexer and antenna are with emission of radio frequency signals;
Low noise amplifier, second frequency mixer, second if bandpas filter and amplifier, coherent detector, analog to digital converter, data recorder, imaging processor are connected in series successively, diplexer is realized received signal and the isolation that transmits, three ports of diplexer are connected with power amplifier, low noise amplifier and antenna respectively, low noise amplifier carries out processing and amplifying with the echoed signal of diplexer; Second frequency mixer is with the echoed signal of processing and amplifying and the carrier frequency f of frequency source output
cCarry out frequency down-converts and become the intermediate frequency chaotic signal; Second if bandpas filter and amplifier carry out filtering and amplification to the intermediate frequency chaotic signal; Coherent detector, the two-way quadrature component of the intermediate frequency chaotic signal detection output base band chaotic signal that filtering is amplified; Analog to digital converter converts two quadrature components of Analog Baseband chaotic signal to the digital baseband echoed signal; Data recorder, the second road chaotic signal of two digital quadrature components of the digital baseband echoed signal of record analog to digital converter output, the output of record base band chaos signal generator is as the reference signal of distance when the pulse compression; Imaging processor feeds imaging processor to the data of data recorder trace and handles in real time and obtain radar image or carry out the back imaging processing obtaining radar image;
The output terminal of frequency source is connected with the input end of quadrature modulator, first frequency mixer, second frequency mixer, coherent detector and timer respectively, the output terminal of timer is connected with the input end of base band chaos signal generator and data recorder respectively, and timer produces start pulse signal makes the base band chaos signal generator synchronous working with data recorder; The second roadbed band chaotic signal of base band chaos signal generator output is connected with the input end of data recorder.
Described base band chaos signal generator is chosen suitable chaotic maps relation and is chosen initial value and send into data processing chip and generate chaos sequence, and the different chaotic signal of Chan Shenging is used as the transmitted waveform of synthetic-aperture radar as required.
The chaotic signal that described base band chaos signal generator produces is a chaotic fm signal, or the chaos phase-modulated signal, or the chaos amplitude-modulated signal.
Adopting two-layer method to generate chaos sequence in the described base band chaos signal generator comprises:
The ground floor iteration produces the initial value of chaos sequence in the different pulses, uses chaotic maps f
1(u, x): I → I, it is ρ that the point in the sequence is obeyed probability density
1(x) distribution is if need N in the task
aIndividual different pulse, then the sequence length of ground floor iteration generation is N
a
The initial value that second layer iteration uses the ground floor iteration to produce generates the chaos sequence in each pulse, uses chaotic maps f
2(u, x): I → I, it is ρ that the point in the sequence is obeyed probability density
2(x) distribution, the chaos sequence length in each pulse is N
r
Described imaging processor comprises: the distance to pulse compression unit, orientation to pulse compression unit, when the base band echoed signal is sent into distance to pulse compression unit, distance uses the second road chaotic signal as the reference function base band echoed signal to be carried out distance to compression to pulse compression unit, through carrying out the orientation to pulse compression unit and obtain radar image to compression apart from feeding the orientation again to the echoed signal of pulse compression.
Described base band chaos signal generator, the second roadbed band chaotic signal of base band chaos signal generator output is as the adaptation function of distance to signal; Or use algorithm and the computational accuracy identical with the base band chaos signal generator, in computing machine, produce adaptation function again.
Described base band chaos signal generator produces chaotic fm signal, is that described chaos sequence is added up, and tries to achieve the sine and cosine value of accumulation result by look-up table, thereby obtains the sampled value sequence of base band chaotic fm signal two-way quadrature component;
It is chaos sequence to be carried out binary quantize or polynary quantification that described base band chaos signal generator produces the chaos phase-modulated signal, thereby obtains two-phase of base band chaos or polyphase code signal sampling value.
Described base band chaos signal generator generates chaos sequence, and wherein the chaos sequence in each pulse adopts mutual uncorrelated mode, its f
1With f
2Adopt different chaotic maps, otherwise f
1With f
2Adopt different control parameters.
Beneficial effect of the present invention: the present invention adopts chaotic signal as transmitted waveform in synthetic-aperture radar, because chaotic signal has initial value susceptibility and randomlikeness, similar white noise, anti-interference with noise signal, be used for not only can obtaining high-definition picture after the synthetic-aperture radar, can also carry out the prompt change of waveform, use the pulse diversity technique, improve the interference free performance of synthetic-aperture radar.The present invention uses chaotic signal transmitting as synthetic-aperture radar, the characteristic of utilizing chaotic signal to repeat to realize, can in computing machine, produce adaptation function again, need when transmitting, generation not write down transmitted waveform, and the noise signal of prior art does not have repeatability, need the real time record transmitted waveform or time-delay is done in transmitted waveform, increased system complexity, this is the difference that chaotic signal is different from noise signal, thereby efficiently solves the problem of noise signal difficult treatment in the prior art.Owing to used the chaotic signal technology, but in the chaotic signal synthetic-aperture radar multiple radar system, be in the mutually orthogonal chaotic signal of radar emission in the same network, each radar can collaborative work, thereby gives full play to the advantage of multiple radar system; In the hyperchannel synthetic-aperture radar, the different mutually orthogonal chaotic signals of passage emission can effectively be distinguished different passages, thereby improves the mapping bandwidth of synthetic-aperture radar or improve resolution.
Description of drawings
Fig. 1 is the polarization sensitive synthetic aperture radar system structured flowchart that the present invention uses chaotic signal
Fig. 2 is the synoptic diagram that the present invention uses the generation chaotic signal of base band chaos signal generator 1
Fig. 3 is that the present invention uses imaging processor structural drawing in the polarization sensitive synthetic aperture radar system of chaotic signal
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail, be to be noted that described embodiment only is intended to be convenient to the understanding of the present invention, and it is not played any qualification effect.
According to Fig. 1 of the present invention, particularly, shown in the polarization sensitive synthetic aperture radar system structured flowchart of use chaotic signal, among the present invention:
1) according to selected chaotic maps and parameter, produce base band chaotic signal sampled value sequence with high-speed dsp chip or fpga chip, obtain the Analog Baseband chaotic signal by digital-to-analog conversion.
2) the chaos baseband signal is carried out orthogonal modulation and obtains the intermediate frequency chaotic signal, process? obtain the radio frequency chaotic signal behind the frequency mixer, send into the transmitter emission.
3) with coherent detector echoed signal is carried out quadrature demodulation.
4) with high-speed computer echoed signal is carried out pulse compression, obtain radar image at last.
Particularly, as comprising among Fig. 1: base band chaos signal generator 1, quadrature modulator 2, first if bandpas filter and amplifier 3, first frequency mixer 4, power amplifier 5, low noise amplifier 6, second frequency mixer 7, second if bandpas filter and amplifier 8, coherent detector 9, analog to digital converter 10, data recorder 11, imaging processor 12, timer 13, frequency source 14, diplexer 15 and antenna 16;
Base band chaos signal generator 1 output two-way base band chaotic signal, the first via base band chaotic signal two-way quadrature component of base band chaos signal generator 1 output is connected with two input ends of quadrature modulator 2, quadrature modulator 2 is with the intermediate frequency f of described first via base band chaotic signal orthogonal modulation to frequency source 14 outputs
oOn, quadrature modulator 2 output intermediate frequency chaotic signals; Quadrature modulator 2, first if bandpas filter and amplifier 3, first frequency mixer 4, power amplifier 5 are connected in series successively, the input end of diplexer 15 is connected with power amplifier 5 output terminals, first if bandpas filter and amplifier 3, described intermediate frequency chaotic signal is carried out filtering and power amplification, first frequency mixer 4 is with the carrier frequency f of intermediate frequency chaotic signal and frequency source 14 outputs
cCarry out mixing and change into radiofrequency signal, power amplifier 5 carries out power amplification with the radiofrequency signal after the mixing and feeds diplexer 15, and diplexer 15 and antenna 16 are with emission of radio frequency signals;
Low noise amplifier 6, second frequency mixer 7, second if bandpas filter and amplifier 8, coherent detector 9, analog to digital converter 10, data recorder 11, imaging processor 12 are connected in series successively, diplexer 15 is realized received signal and the isolation that transmits, three ports of diplexer 15 are connected with power amplifier 5, low noise amplifier 6 and antenna 16 respectively, low noise amplifier 6 carries out processing and amplifying with the echoed signal of diplexer 15; Second frequency mixer 7 is with the echoed signal of processing and amplifying and the carrier frequency f of frequency source 14 outputs
cCarry out frequency down-converts and become the intermediate frequency chaotic signal; Second if bandpas filter and amplifier 8 carry out filtering and amplification to the intermediate frequency chaotic signal; Coherent detector 9, the two-way quadrature component of the intermediate frequency chaotic signal detection output base band chaotic signal that filtering is amplified; Analog to digital converter 10 converts two quadrature components of Analog Baseband chaotic signal to the digital baseband echoed signal; Data recorder 11, the second road chaotic signal of two digital quadrature components of the digital baseband echoed signal of record analog to digital converter 10 output, 1 output of record base band chaos signal generator is as the reference signal of distance when the pulse compression; Imaging processor 12 feeds imaging processor 12 to the data of data register 11 record and handles in real time and obtain radar image or carry out the back imaging processing obtaining radar image;
The output terminal of frequency source 14 is connected with the input end of quadrature modulator 2, first frequency mixer 4, second frequency mixer 7, coherent detector 9 and timer 13 respectively, the output terminal of timer 13 is connected with the input end of base band chaos signal generator 1 with data recorder 11 respectively, and timer 13 produces start pulse signal makes base band chaos signal generator 1 synchronous working with data recorder 11; The second roadbed band chaotic signal of base band chaos signal generator 1 output is connected with the input end of data recorder 11.
Described base band chaos signal generator 1 is chosen suitable chaotic maps relation and is chosen initial value and send into data processing chip and generate chaos sequence, and the different chaotic signal of Chan Shenging is used as the transmitted waveform of synthetic-aperture radar as required.
The chaotic signal that described base band chaos signal generator 1 produces is a chaotic fm signal, or the chaos phase-modulated signal, or the chaos amplitude-modulated signal.
Described base band chaos signal generator 1, the second roadbed band chaotic signal of base band chaos signal generator 1 output is as the adaptation function of distance to signal; Or identical algorithm and the computational accuracy of use and base band chaos signal generator 1, in computing machine, produce adaptation function again.
The concrete enforcement of the present invention is as follows:
Base band chaos signal generator 1 adopts dsp chip or fpga chip, for example TMS320C6414;
First if bandpas filter and amplifier 3 can adopt integrated circuit (IC) chip, for example the bandpass filter of AD company and amplifier family chip;
First frequency mixer 4 can adopt integrated circuit (IC) chip, for example the frequency mixer family chip of AD company;
Power amplifier 5 mainly is made up of travelling-wave tube, TWT Power and radio frequency output selector switch
Low noise amplifier 6 can be selected integrated circuit modules for use, as the low noise amplifier of Miteq;
Second frequency mixer 7 can adopt integrated circuit (IC) chip, for example the frequency mixer family chip of AD company;
Second if bandpas filter and amplifier 8 can adopt integrated circuit (IC) chip, for example the bandpass filter of AD company and amplifier family chip;
Coherent detector 9 can adopt integrated circuit (IC) chip, for example the detuner family chip of AD company;
Analog to digital converter 10 can adopt integrated circuit (IC) chip, for example the analog to digital conversion family chip of AD company;
Data recorder 11 adopts magnetic disk recorder;
Imaging processor 12 can use PC, operating system Window XP;
Timer 13 can design with FPGA;
It is the reference frequency that frequency source 14 can be selected the 100MHz crystal oscillator of high frequency stability for use, produces each required road signal through phase-locked, frequency multiplication or frequency division;
Diplexer 15 customizes according to task
During device work of the present invention, base band chaos signal generator 1 is divided into the output of two-way base band chaotic signal, first via base band chaotic signal is a simulating signal, obtain the intermediate frequency chaotic signal through quadrature modulator 2, first if bandpas filter and amplifier 3 modulation, the intermediate frequency chaotic signal obtains radiofrequency signal after by 4 mixing of first frequency mixer, and radiofrequency signal is amplified through power amplifier 5 and sent into diplexer 15 and antenna 16 is launched;
The second roadbed band chaotic signal is output as digital signal, send into data recorder 11 records as the reference signal of distance when pulse compression, echoed signal from diplexer 15 becomes intermediate-freuqncy signal through low noise amplifier 6,7 frequency conversions of second frequency mixer, intermediate-freuqncy signal is sent into coherent detector 9 after through second if bandpas filter and amplifier 8, and the detection of coherent detector 9 outputs obtains I
1/ Q
1Two paths of signals is also sent into data recorder 11, the data of data register 11 record is fed imaging processor 12 carry out real-time or the back imaging processing just obtains radar image.Chaos signal generator and imaging processing are crucial among the present invention.
Particularly, base band chaos signal generator 1 of the present invention can use dsp chip or fpga chip, chooses suitable chaotic maps relation and chooses initial value and send into dsp chip and generate chaos sequence, the different chaotic signal of Chan Shenging as required.Chaos sequence there are two kinds of disposal routes:
Described base band chaos signal generator 1 produces chaotic fm signal, is that described chaos sequence is added up, and tries to achieve the sine and cosine value of accumulation result by look-up table, thereby obtains the sampled value sequence of base band chaotic fm signal two-way quadrature component;
Described base band chaos signal generator 1 produces different chaotic signals and comprises, produces the chaos phase-modulated signal; Described generation chaos phase-modulated signal is chaos sequence to be carried out binary quantize or polynary quantification, thereby obtains two-phase of base band chaos or polyphase code signal sampling value.
In the present invention, SAR works in pulse mode, and in order to become in interpulse realization waveform victory, the chaos sequence in each pulse should be chosen different initial values.The simplest method is to produce one section long chaos sequence, and is divided into a lot of segments, and different segment chaos sequences is used in different pulses, thereby the chaos sequence between each pulse is uncorrelated.This method has a very big defective, because the restriction of computational accuracy, when producing chaos sequence in digital method, chaos sequence finally can become periodic sequence, and therefore one section long chaos sequence will inevitably periodization, influences the mutual irrelevance between each pulse.
In order to address this problem, use two-layer method to produce chaos sequence among the present invention, Fig. 2 generates chaos sequence shown in the synoptic diagram of the present invention's generation chaotic signal of using base band chaos signal generator 1, adopts two-layer method to generate and comprises:
Ground floor mapping iteration produces the initial value of chaos sequence in the different pulses, and wherein ground floor is mapped as x
00x
10... x
(Na-1)0, use chaotic maps f
1(u, x): I → I, it is ρ that the point in the sequence is obeyed probability density
1(x) distribution is if task needs N
aIndividual mutual incoherent pulse, then the sequence length of ground floor iteration generation is N
a
The initial value that second layer iteration uses the ground floor iteration to produce generates the chaos sequence in each pulse, and wherein the second layer is mapped as: first pulse chaos sequence is: x
00, x
01... x
0Nr-1, second pulse chaos sequence is: x
10, x
11... x
1Nr-1..., Na pulse chaos sequence is: x
(Na-1) 0x
(Na-1) 1... x
(Na-1) (Nr-1)Use chaotic maps f
2(u, x): I → I, it is ρ that the point in the sequence is obeyed probability density
2(x) distribution, the chaos sequence length in each pulse is N
r
Described base band chaos signal generator 1 generates chaos sequence, and wherein the chaos sequence in each pulse adopts mutual uncorrelated mode, its f
1With f
2Adopt different chaotic maps,, then should get different control parameters if form is the same, otherwise f
1With f
2Adopt different control parameters.
As Fig. 3 is that the present invention uses in the polarization sensitive synthetic aperture radar system of chaotic signal shown in the imaging processor structural drawing, described in imaging processor 12 advanced row distance compress to signal pulse, carry out the orientation again to pulse compression.Described distance produces the adaptation function of distance to signal to signal, and two kinds of methods are arranged, one, and distance uses the second roadbed band chaotic signal of base band chaos signal generator 1 output to do reference signal to the adaptation function of signal; Its two, using the algorithm identical with base band chaos signal generator 1 is identical chaotic maps and identical initial value and computational accuracy, concrete computational accuracy is selected according to mission requirements, produces adaptation function in imaging processor 12 again.This is the difference that chaotic signal is different from noise signal.
According to Fig. 1 and shown in Figure 3, be that imaging processor 12 comprises: the distance to pulse compression unit 17, orientation to pulse compression unit 18, when the base band echoed signal is sent into distance to pulse compression unit 17, distance uses the second roadbed band chaotic signal as the reference function base band echoed signal to be carried out distance to compression to pulse compression unit 17, carry out the orientation to compression through feeding the orientation again to pulse compression unit 18, thereby obtain radar image apart from echoed signal to pulse compression.
Emphasize that at last top description is to be used to realize the present invention and embodiment, those of ordinary skills can determine multiple implementation method according to actual conditions, and therefore, scope of the present invention should not described by this and limit.It should be appreciated by those skilled in the art,, all belong to claim of the present invention and come restricted portion in any modification or partial replacement that does not depart from the scope of the present invention.
Claims (9)
1, a kind of polarization sensitive synthetic aperture radar system that uses chaotic signal is characterized in that: comprise base band chaos signal generator, quadrature modulator, first if bandpas filter and amplifier, first frequency mixer, power amplifier, low noise amplifier, second frequency mixer, second if bandpas filter and amplifier, coherent detector, analog to digital converter, data recorder, imaging processor, timer, frequency source, diplexer and antenna;
Base band chaos signal generator output two-way base band chaotic signal, the first via base band chaotic signal two-way quadrature component of base band chaos signal generator output is connected with two input ends of quadrature modulator, quadrature modulator is with the intermediate frequency f of described first via base band chaotic signal orthogonal modulation to frequency source output
0On, quadrature modulator output intermediate frequency chaotic signal; Quadrature modulator, first if bandpas filter and amplifier, first frequency mixer, power amplifier are connected in series successively, the input end of diplexer is connected with the power amplifier output terminal, first if bandpas filter and amplifier, described intermediate frequency chaotic signal is carried out filtering and power amplification, first frequency mixer is with the carrier frequency f of intermediate frequency chaotic signal and frequency source output
0Carry out mixing and change into radiofrequency signal, power amplifier carries out power amplification with the radiofrequency signal after the mixing and feeds diplexer, and diplexer and antenna are with emission of radio frequency signals;
Low noise amplifier, second frequency mixer, second if bandpas filter and amplifier, coherent detector, analog to digital converter, data recorder, imaging processor are connected in series successively, diplexer is realized received signal and the isolation that transmits, three ports of diplexer are connected with power amplifier, low noise amplifier and antenna respectively, low noise amplifier carries out processing and amplifying with the echoed signal of diplexer; Second frequency mixer carries out frequency down-converts with the carrier frequency fc of the echoed signal of processing and amplifying and frequency source output and becomes the intermediate frequency chaotic signal; Second if bandpas filter and amplifier carry out filtering and amplification to the intermediate frequency chaotic signal; Coherent detector, the two-way quadrature component of the intermediate frequency chaotic signal detection output base band chaotic signal that filtering is amplified; Analog to digital converter converts two quadrature components of Analog Baseband chaotic signal to the digital baseband echoed signal; Data recorder, the second roadbed band chaotic signal of two digital quadrature components of the digital baseband echoed signal of record analog to digital converter output, the output of record base band chaos signal generator is as the reference signal of distance when the pulse compression; Imaging processor feeds imaging processor to the data of data recorder trace and handles in real time and obtain radar image or carry out the back imaging processing obtaining radar image;
The output terminal of frequency source is connected with the input end of quadrature modulator, first frequency mixer, second frequency mixer, coherent detector and timer respectively, the output terminal of timer is connected with the input end of base band chaos signal generator and data recorder respectively, and timer produces start pulse signal makes the base band chaos signal generator synchronous working with data recorder; The second roadbed band chaotic signal of base band chaos signal generator output is connected with the input end of data recorder.
2, according to the polarization sensitive synthetic aperture radar system of the described use chaotic signal of claim 1, it is characterized in that: described base band chaos signal generator, choose suitable chaotic maps relation and choose initial value and send into data processing chip and generate chaos sequence, the different chaotic signal of Chan Shenging is used as the transmitted waveform of synthetic-aperture radar as required.
3, according to the polarization sensitive synthetic aperture radar system of claim 1,2 described use chaotic signals, it is characterized in that: the chaotic signal that described base band chaos signal generator produces is a chaotic fm signal, or the chaos phase-modulated signal, or the chaos amplitude-modulated signal.
4, according to the polarization sensitive synthetic aperture radar system of claim 1,2,3 described use chaotic signals, it is characterized in that: adopt two-layer method to generate chaos sequence in the described base band chaos signal generator and comprise:
The ground floor iteration produces the initial value of chaos sequence in the different pulses, uses chaotic maps f
1(u, x): I → I, it is ρ that the point in the sequence is obeyed probability density
1(x) distribution is if need N in the task
aIndividual different pulse, then the sequence length of ground floor iteration generation is N
a
The initial value that second layer iteration uses the ground floor iteration to produce generates the chaos sequence in each pulse, uses chaotic maps f
2(u, x): I → I, it is ρ that the point in the sequence is obeyed probability density
2(x) distribution, the chaos sequence length in each pulse is N
r
5, according to the polarization sensitive synthetic aperture radar system of the described use chaotic signal of claim 1, it is characterized in that: described imaging processor comprises: the distance to pulse compression unit, orientation to pulse compression unit, when the base band echoed signal is sent into distance to pulse compression unit, distance uses the second roadbed band chaotic signal as the reference function base band echoed signal to be carried out distance to compression to pulse compression unit, through carrying out the orientation to pulse compression unit and obtain radar image to compression apart from feeding the orientation again to the echoed signal of pulse compression.
6, according to the polarization sensitive synthetic aperture radar system of the described use chaotic signal of claim 1, it is characterized in that: described base band chaos signal generator, the second roadbed band chaotic signal of base band chaos signal generator output is as the adaptation function of distance to signal; Or use algorithm and the computational accuracy identical with the base band chaos signal generator, in computing machine, produce adaptation function again.
7, according to the polarization sensitive synthetic aperture radar system of the described use chaotic signal of claim 3, it is characterized in that: described base band chaos signal generator produces chaotic fm signal, be that described chaos sequence is added up, try to achieve the sine and cosine value of accumulation result by look-up table, thereby obtain the sampled value sequence of base band chaotic fm signal two-way quadrature component;
8, according to the polarization sensitive synthetic aperture radar system of the described use chaotic signal of claim 3, it is characterized in that: it is chaos sequence to be carried out binary quantize or polynary quantification that described base band chaos signal generator produces the chaos phase-modulated signal, thereby obtains two-phase of base band chaos or polyphase code signal sampling value.
9, according to the polarization sensitive synthetic aperture radar system of the described use chaotic signal of claim 4, it is characterized in that: described base band chaos signal generator generates chaos sequence, and wherein the chaos sequence in each pulse adopts mutual uncorrelated mode, its f
1With f
2Adopt different chaotic maps, otherwise f
1With f
2Adopt different control parameters.
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