CN1952685B - Chaotic radar system with chaotic synchronization - Google Patents
Chaotic radar system with chaotic synchronization Download PDFInfo
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- CN1952685B CN1952685B CN200610154604A CN200610154604A CN1952685B CN 1952685 B CN1952685 B CN 1952685B CN 200610154604 A CN200610154604 A CN 200610154604A CN 200610154604 A CN200610154604 A CN 200610154604A CN 1952685 B CN1952685 B CN 1952685B
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Abstract
The invention discloses a chaos radar system using chaos synchronization which contains: microwave chaos signal circuit, power distributed device, the first amplifier, transmitting antenna, digital control microwave delaying circuit, receiving antenna, the second amplifier, self-adapting filter circuit, chaos prediction circuit, relative circuit, signal processing unit and electrical source. Thesignals generated by the microwave colpitts chaos circuit are the signals of radar source, a part of the chaos signals become the transmitting signals, a part engender delaying via the chaos circuit.When the echo signals are received, the echo signals drive the microwave chaos circuit which is as the chaos synchronization, and the output synchronizing signals correlate the local delaying signalsto detect the parameters of position and velocity of the radar target.
Description
Technical field
The present invention relates to a kind of device that adopts the radiowave range finding or test the speed, especially relate to a kind of synchronous chaotic radar system of chaos that utilizes.
Background technology
The core requirement of modern military radar is to have minimum intercept probability and good antijamming capability; Commerical radar is then emphasized excellent Electro Magnetic Compatibility more.The demand of above-mentioned dual-use radar is the different aspect of a problem in theory: promptly how to make more image width band noise of radar signal.Just with spread spectrum communication military, the application trend of CDMA in commercial wireless communication networks is similar, the New System chaotic radar system with ultra broadband, noise like power spectrum characteristic will be a developing direction of following dual-use radar.
Utilize ultra broadband, the noise like characteristic of chaotic signal to make up the more existing researchs of chaotic radar system, but related work mainly concentrates on pseudo-chaos sequence coding or low frequency, intermediate frequency chaos circuit as the means of obtaining random signal, still adopts the practice of typical random signal radar at system aspects.With pseudo-chaos sequence coding or adopt low frequency, intermediate frequency chaos circuit to obtain the way of random signal, at radar transmitter one end, need carry out extra modulation to signal, system architecture is comparatively complicated, and this patent directly uses the microwave chaotic signal can be so that system architecture is comparatively simple; Existing chaotic radar system is continued to use the disposal route of traditional RANDOM SIGNAL RADAR, does not have to make full use of the characteristic and the potential of chaotic signal, and this patent utilizes the chaos simultaneous techniques to carry out chaotic Signals Processing, can go up largely and improve the radar overall performance.
Summary of the invention
The object of the present invention is to provide a kind of synchronous chaotic radar system of chaos that utilizes.
The technical solution adopted for the present invention to solve the technical problems is: comprise microwave chaotic signal source circuit, power splitter, first amplifier, emitting antenna, digital control microwave delay line, receiving antenna, second amplifier, auto-adaptive filter circuit, chaos synchronizing circuit, interlock circuit, signal processing unit and power unit; Use microwave Colpitts chaotic oscillator as microwave chaotic signal source circuit, through behind the power splitter, a part of power inserts transmitting radar antenna after through first amplifier; Through behind the power splitter, another part power inserts the digital control microwave delay line; After the transmitting of emitting antenna ran into barrier, echoed signal was received antenna and receives, after inserting second amplifier and amplifying, through auto-adaptive filter circuit filtering noise signal; The signal of auto-adaptive filter circuit output inserts the chaos synchronizing circuit, and the signal after handling through the chaos synchronizing circuit inserts interlock circuit with digital control microwave delay line output signal again; The output of interlock circuit inserts signal processing unit, and produces a digital controlled signal, is linked into digital control microwave delay line (5) and it is controlled makes it operate as normal.
The described synchronous chaotic radar system of chaos that utilizes is characterized in that: described signal processing unit is computing machine or uses embedded processing systems based on microprocessor, DSP or FPGA.
The useful effect that the present invention has is: use microwave Colpitts chaos circuit as radar signal source, can produce the continuous frequency spectrum from the direct current to the microwave frequency band, have that circuit structure is simple, a stable performance, advantages of cheap price.Use the digital control microwave delay line, significantly reduced the workload of interlock circuit.Before the relevant treatment of chaotic radar receiver, carry out the synchronous processing of chaos earlier, the noise in the echo chaotic signal that can suppress to receive, the correlativity of raising echo chaotic signal and source chaotic signal, reduce the back-end processing workload, improve the radar overall performance.
Description of drawings
Fig. 1 is the radar arrangement schematic diagram that the present invention realizes;
Fig. 2 is the chaos synchronizing circuit figure that the present invention realizes.
Among the figure: 1, microwave chaotic signal source circuit, 2, power splitter, 3, first amplifier, 4, emitting antenna, 5, digital control microwave delay line, 6, receiving antenna, 7, second amplifier, 8, auto-adaptive filter circuit, 9, chaos synchronizing circuit, 10, interlock circuit, 11, signal Processing.
Embodiment
As shown in Figure 1, the present invention includes microwave chaotic signal source circuit 1, power splitter 2, first amplifier 3, emitting antenna 4, digital control microwave delay line 5, receiving antenna 6, second amplifier 7, auto-adaptive filter circuit 8, chaos synchronizing circuit 9, interlock circuit 10 and signal processing unit 11 and power unit.
(a) use microwave chaos Colpitts oscillator as microwave chaotic signal source circuit 1, through behind the power splitter 2, a part of power inserts emitting antenna 4 through first amplifier 3 and sends; The chaotic signal bandwidth that sends can surpass 1GHz, and narrow band noise and broadband noise are all had stronger antijamming capability, and its time domain waveform and noise are similar, and anti-interception capability is strong;
(b) through behind the power splitter 2, another part power inserts digital control microwave delay line 5;
(c) after the signal of emitting antenna 4 emissions ran into barrier, echoed signal was received antenna 6 and receives, and inserted second amplifier 7 and amplified, and inserted auto-adaptive filter circuit 8 filtering out-of-band noise signals again;
(d) signal of auto-adaptive filter circuit 8 outputs inserts chaos synchronizing circuit 9.The chaos synchronizing circuit has from noise the chaotic signal is considered the ability of removing, and can consider to a great extent except that the in-band noise signal after handling through chaos synchronizing circuit 9, extracts effective chaotic signal.The output signal of chaos synchronizing circuit 9 inserts interlock circuit 10 with digital control microwave delay line 5 output signals again;
(e) output of interlock circuit 10 inserts signal processing unit 11, obtains the parameter of barrier target.
Below concrete embodiment of setting forth various piece.
The microwave chaotic signal source circuit 1 of radar transmitter part is used microwave Colpitts chaos circuit, its specific implementation can be called " based on the ultra-broadband signal method for generation and the circuit of chaotic signal broadband character " with reference to disclosed name, and number of patent application is 200410052855.5 patent.
Emitting antenna 4 can adopt the form of bell-mouth antenna, can select for use the Xi'an perseverance to reach the double-ridged horn antenna HD-0220DRHA of microwave technology development corporation, Ltd., working frequency range 200MHz～2GHz, average power gain 8.5dB, typical case VSWR is less than 2.5, N-50K joint, mean wave beam width E plane 65 degree, H plane 50 degree can satisfy application requirements.Emitting antenna also can design voluntarily.
Digital control microwave delay line 5 comprises two parts: regular length delay line and digital controllable length delay line.What the regular length delay line had determined target object can detect distance recently, and the microstrip line that is designed to certain-length and impedance matching gets final product.The length of digital controllable length delay line is at distance of zero mark degree and a maximum length τ
MaxBetween discrete variable, control by digital signal.The implementation method of digital controllable delay line is: multistage regular length delay line is connected, to every section delay line, control its break-make by Digital Signals PIN pipe, the time-delay that the break-make combination of multistage delay line can produce the different time step-length.What the maximum length of controlled length delay line had determined target object can detect distance farthest.
Amplifier 7 in the receiver uses the low noise high-gain amplifier, can select the 11909A of Agilent company for use, and operating frequency range is 9KHz to 1GHz, has good noise figure (representative value 1.8dB) and gain (representative value 32dB).
Auto-adaptive filter circuit 8 is mainly used to filtering out-of-band noise and interference, can use ready-made product, as the JXWBLB-S-BP-500-1000 of A-INFO company, frequency of operation be 500MHz to 1GHz, passband gain 2.5dB, stopband attenuation 35dB, the VSWR representative value is 35dB, can meet design requirement.Sef-adapting filter also can be voluntarily according to using capacitance resistance and inductance to design to the requirement of passband and stopband signal.
The realization circuit diagram of chaos synchronizing circuit 9 as shown in Figure 2, its main body is the microwave Colpitts chaos circuit that and radiating portion microwave chaotic signal source circuit 1 have same parameter.Signal inserts from Vin, is coupled in the microwave Colpitts chaos circuit through capacitor C C, exports from Vout through after the synchronous processing.The synchronous chaos signal of output is linked into interlock circuit 10.The processing of chaos synchronizing circuit 9, the noise effect in can effectively filtering echoed signal improves the correlativity of output signal and reference signal when detecting target greatly, simplifies the digital signal processing of rear end.This is crucial innovation of the present invention place.
Interlock circuit 10 needs to use digital correlation method to realize, reference signal and the synchronous chaos signal that is input to interlock circuit at first carried out mould/transformation of variables, mould/transformation of variables can be adopted the AD multifunctional high speed capture card of Shanghai thinking Automatisme technology company limited, or the high-speed AD acquisition card that digital technology company limited provides is believed in high matchmaker sky, Beijing.Mould/transformation of variables is obtained reference number sequence and Synchronous Digital Hierarchy carry out relevantly, correlated results is outputed to signal processing unit 11.The output of interlock circuit 10 also will produce a digital controlled signal except being linked into signal processing unit 11, be linked into digital control microwave delay line 5 and it is controlled make it operate as normal.
Claims (2)
1. utilize the synchronous chaotic radar system of chaos, it is characterized in that: comprise microwave chaotic signal source circuit (1), power splitter (2), first amplifier (3), emitting antenna (4), digital control microwave delay line (5), receiving antenna (6), second amplifier (7), auto-adaptive filter circuit (8), chaos synchronizing circuit (9), interlock circuit (10), signal processing unit (11) and power unit; Use microwave Colpitts chaotic oscillator as microwave chaotic signal source circuit (1), behind power splitter (2), a part of power inserts transmitting radar antenna (4) through first amplifier (3) back; Behind power splitter (2), another part power inserts digital control microwave delay line (5); After the transmitting of emitting antenna (4) ran into barrier, echoed signal was received antenna (6) and receives, after inserting second amplifier (7) and amplifying, through auto-adaptive filter circuit (8) filtering noise signal; The signal of auto-adaptive filter circuit (8) output inserts chaos synchronizing circuit (9), and the signal after handling through chaos synchronizing circuit (9) inserts interlock circuit (10) with digital control microwave delay line (5) output signal again; The output of interlock circuit (10) inserts signal processing unit (11), and produces a digital controlled signal, is linked into digital control microwave delay line (5) and it is controlled makes it operate as normal.
2. the synchronous chaotic radar system of chaos that utilizes according to claim 1 is characterized in that: described signal processing unit (11) is computing machine or uses embedded processing systems based on microprocessor, DSP or FPGA.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5398195B2 (en) * | 2007-08-31 | 2014-01-29 | 古野電気株式会社 | Radar equipment |
| CN101262300B (en) * | 2008-04-30 | 2011-12-21 | 浙江大学 | Chaos interference system for chaos synchronization |
| CN101799539B (en) * | 2010-01-05 | 2012-05-23 | 中国人民解放军重庆通信学院 | Chaotic distance-testing method and device |
| CN104181522A (en) * | 2014-08-22 | 2014-12-03 | 中国科学院空间科学与应用研究中心 | Real-time chaos pseudo-random signal radar receiving and transmitting system |
| CN104765031B (en) * | 2015-03-02 | 2017-03-01 | 太原理工大学 | A kind of ultra-wideband microwave chaos life detection radar device |
| CN108828534B (en) * | 2018-06-11 | 2022-07-26 | 太原理工大学 | Radar detection device based on chaotic laser signal |
| CN113406435A (en) * | 2021-06-17 | 2021-09-17 | 太原理工大学 | Rapid lossless cable fault positioning device based on chaotic synchronization |
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