CN102608617B - Chaotic laser-based ultra wide band throughwall radar detection device - Google Patents
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Abstract
The invention discloses a chaotic laser-based ultra wide band throughwall radar detection device, wherein the chaotic laser is sent out by an ultra wide band chaotic laser source and is modulated by a time signal into a periodically-emitted chaotic laser impulse sequence after passing through an electrooptical modulator, the chaotic laser impulse sequence is separated into a detected signal and a reference signal by an optical fiber coupler, the detected signal is injected into a photoelectric detector to be converted into an ultra wide band microwave signal, the ultra wide band microwave signal is amplified by a preamplifier and sent out by an ultra wide band microwave transmitting antenna; and at a receiving end, the return signal which is scattered by a target object passes through an obstacle and then received by two paths of receiving antennas, the received return signal is amplified by a low noise amplifier, synchronously acquired by a synchronous acquisition system, and then input into a digital correlator for being correlated with the reference signal which is converted into an electrical signal after passing through a quick light variable delay line and the photoelectric detector, so the characteristic information of the target object is obtained, two paths of characteristic information are input into a signal processing system to be processed for obtaining the azimuth angle and distance of the target object, so the locating and the two-dimensional imaging of the target object are realized.
Description
Technical field
The present invention relates to a kind of radar detection apparatus, especially constitute a kind of ultra-broadband wall-through radar detection apparatus based on chaotic laser light by transmitting terminal and receiving end, for Non-Destructive Testing and the life detection of personnel's relief after the calamity, military affairs, anti-terrorism, historical relic.
Background technology
Since the World War II, radar is being brought into play more and more important effect in Aeronautics and Astronautics, communications and transportation, weather forecast, geodetic surveying and military affairs.Radar in the battlefield in modern times, in the ruins in disaster area, has very important effect as the important means that obtains spatial information.
Nowadays each main big state of the world all is faced with the challenge of severe struggle against terror, if can find to be hidden in the enemy of wall back, can increase stratagem ensuring success somewhat undoubtedly, reduces casualties; In the ruins of fire and earthquake, if can know survivor's definite position, can bring the hope of more life undoubtedly; When large-area burns or deadly infectious disease people are guarded, if can the various physiological datas of remote measurement, can retrieve more life undoubtedly.Detection Techniques through walls are arisen at the historic moment under these demands, this technology can be surveyed the target of being blocked by barrier, especially life target and various feature thereof can be widely used in military surveillance, port war, fire-fighting and fields such as disaster relief and medical treatment, development in recent years is rapid, especially behind the Wenchuan earthquake in 2008, highlight important value and the effect of detection radar through walls more.
And in the radar development course of decades, narrow band signal is the main signal form of its emission always.Research to radar signal also mainly concentrates on the narrow band signal always.On some meaning, conventional Narrow-band Radar technology is a technology that maturation is perfect, the resolution of radar, find range, test the speed, anti-interference, operating distance etc. also are greatly improved.But meanwhile, the radar application environment is also in continuous deterioration, correspondingly, electronic countermeasure to the antagonism of radar mainly also to disturb Narrow-band Radar.Under informationization operation condition, the residing electromagnetic environment of radar will be more abominable, and the traditional narrow radar threatens greatly in the face of four of radar---and electronic interferences, antiradiation missile, low-level penetration and stealth technology, it is at a loss what to do usually to become.
For many years, people seek to improve the method for the antijamming capability of original radar system always, or design the New System radar that existing fine antijamming capability has good speed and distance resolution again.
Eighties of last century the seventies has proposed ultra broadband (UltraWide-Band, UWB) concept of signal (James D.Taylor.Introduction to ultrawideband radar system.USA:CRC PressBoca Raton.1995.).The relative bandwidth that it is defined as system and signal surpasses 25%, and relative bandwidth refers to the ratio of bandwidth and centre frequency, namely
B
f=（f
H-f
L）/f
0=2(f
H-f
L)/(f
H+f
L)
In the formula, f
HAnd f
LUpper limiting frequency and the lower frequency limit of difference correspondence-10dB place signal.
ULTRA-WIDEBAND RADAR refers to that the detection of radar is the radar of ultra-broadband signal, it is a kind of radar that has future of New System, than Narrow-band Radar, wideband radar have more advantage (A Fangsuo. Fa Lina (Xu Xiaojian, Huang Peikang translates the school). high-resolution radar detection-beforehand research problem and potential application. systems engineering and electronic technology, 1992 (1): 1 ~ 9.): high range resolution, good target recognition capability, imaging capability, the ability of discovery concealed target, multipath fading is little and system architecture is simple etc.And along with the end of the war in Iraq, increasing military field engineering personnel recognize that also the street fighting of large-scale city will become following area.So ULTRA-WIDEBAND RADAR more and more receives everybody concern, increasing researchist focuses on sight research and the design of ULTRA-WIDEBAND RADAR.
In Radar Design, the Waveform Design of radar is one of important content of radar overall design, and the waveform of radar has determined the generation design of radar system, signal and optimum receiving signal disposal route etc.If what radar adopted is the lower determinacy radar waveform of complexity, just very easily intercepted and captured by the enemy, and adopt complexity ultrabroad band random waveform high, that have " drawing pin type " ambiguity function, just can obtain extremely low by intercept probability and extremely strong interference free performance.The chaotic signal waveform complexity height of inventor laboratory institute research experiment is well suited for doing transmitting of radar.
Chaos is the class phenomenon at random that produces in the deterministic nonlinear dynamic system, it has long-term unpredictability, to the susceptibility of initial value, have special nature such as strange attractor, shape and noise are the spitting image of seemingly, it has reflected the intrinsic stochasticity of nonlinear system, present extremely strong interference free performance, have ergodic characteristic (Shen Ying, Liu state year. the ambiguity function of CHAOTIC PHASE MODULATED radar signal. the electronics science academic periodical, 2000,22 (1): 55 1 60.).
Chaotic signal itself anti-interference by force, noise like, not reproducible, spectral characteristic such as is easy to control at the characteristic that conventional system can't have both, and makes it that very good low probability of intercept and noiseproof feature be arranged; Because chaotic signal can be realized the attribute of " multi-user " to the susceptibility of the inherent parameter of system; Its ambiguity function is that desirable " drawing pin type " makes it have the fuzzy range finding of nothing, the performance that tests the speed and good distance, velocity resolution simultaneously.Sharp-pointed correlation properties, " drawing pin type " ultra wide band chaotic signal of ambiguity function just in time meet the needs of modern radar system, modern radar more and more tends to use has more broadband, higher frequency, and signal form more and more at random, and the ultra wide band chaotic signal significantly meets these requirements.
And chaotic signal is noise-like signal, than the random noise radar, chaotic signal determinacy in itself, make the generation system of chaotic radar waveform simple, statistical property and track control easily, has bigger advantage than direct employing random signal such as noise signal in actual use.So also shown great attention to by each scientific research institution in the world about the research of chaos wireless communication system and RANDOM SIGNAL RADAR device aspect, chaos source.
2007, the new group of Ran Li has proposed a kind of chaotic signal and synchronous (S. Qiao of ULTRA-WIDEBAND RADAR system of chaos of utilizing, Z. G. Shi, K. S. Chen, W. Z. Cui W. Ma, T. Jiang and L. X. Ran, " A new architecture of UWB radar utilizing microwave chaotic signals and chaos synchronization ", Progress In Electromagnetics Research, PIER 75,225 – 237,2007. and Z. G. Shi, S. Qiao, K. S. Chen, W. Z. Cui, W. Ma, T. Jiang and L. X. Ran, " Ambiguity functions of direct chaotic radar employing microwave chaotic chaotic Colpitts oscillator ", Progress In Electromagnetics Research, PIER 77,1 – 14,2007.).They directly as the signal of radar, realize the recovery of target echo to the chaotic signal of microwave chaotic oscillator generation synchronously by chaos.They simulate system, and analog result shows that the basic frequency of the signal that microwave oscillator produces has reached 1.6GHz.Also have the good interference free performance of chaotic radar: be lower than in signal to noise ratio (S/N ratio)-situation of 20dB under, system still can operate as normal.
But, if directly produce and the modulating UWB microwave signal in electric territory, no matter be traditional technology or the method for the chaotic signal that produces with the microwave chaotic oscillator, all be faced with same problem: namely be subject to the electronic bottleneck problem, can't be directly produce and modulate more high frequency band (millimeter wave or nearly millimere-wave band), the ultra-wideband microwave signal of high bandwidth more in electric territory.And the resolution of ultra-broadband wall-through radar is decided by the bandwidth of ultra-broadband signal, and therefore the ultra-broadband signal that produces in electric territory will limit the resolution of ultra-broadband wall-through radar greatly.
The present invention learns thought in conjunction with microwave photon, realize photoproduction ultra-wideband microwave technology, got around the unavoidable electronic bottleneck problem of conventional art cleverly, utilize light beam to go into/the ultra broadband characteristic of the chaotic laser light that the light feedback semiconductor laser produces, realize the millimere-wave band high frequency band of centre frequency and bandwidth flexible and controllable, the generation of high bandwidth ultra broadband random signal, and by in conjunction with ultra-wideband microwave signal transmitting and receiving technology and chaos auto-correlation ranging technology, realize that finally being used for subterranean resource surveys, the Non-Destructive Testing of historical relic, the millimeter level high resolving power ultra wide band chaotic random signal Through-Wall Radar System in fields such as military anti-terrorism and post-disaster search and rescue.
Summary of the invention
The object of the present invention is to provide a kind of ultra-broadband wall-through radar detection apparatus based on chaotic laser light, solve the existing low problem of ultra-broadband wall-through radar resolution.
Based on the problems referred to above and purpose, the measure that the present invention takes is a kind of ultra-broadband wall-through radar detection apparatus based on chaotic laser light, comprise the radar detection apparatus that is constituted by transmitting terminal and receiving end, the transmission antennas transmit ultra-wideband microwave signal that it is characterized in that transmitting terminal passes barrier arrival object, the back is by the object reflection, and reflected signal is received and handled by the receiving end antenna; Wherein:
Described transmitting terminal is the chaotic laser light pulse train that is modulated to the cycle emission by the electrooptic modulator of ultra wide band chaotic lasing light emitter emission chaotic laser light process clock system in a period of time, and be divided into through fiber coupler and survey light and reference light II, survey light and be converted into electric signal through first photodetector by light signal, behind prime amplifier, sent by emitting antenna;
Described receiving end is to receive echoed signal by two-way, the first via receives echoed signal by first receiving antenna, after first low noise amplifier amplifies, gather signal by the first synchronous acquisition system, import first digital correlator with through the relevant and characteristic information of acquisition target object of the reference signal of the quick vairable delay line of light and photodetector; Secondary route second receiving antenna receives echoed signal, after second low noise amplifier amplifies, gather signal by the second synchronous acquisition system, import second digital correlator with relevant and obtain the characteristic information of target object through the reference signal of the quick vairable delay line of light and photodetector, extract the two-way characteristic information then and be input to the signal processing system signal and handle input display afterwards.Its described ultra wide band chaotic lasing light emitter is that two two feedback semiconductor lasers of associating that inject produce.
A kind of ultra-broadband wall-through radar detection apparatus based on chaotic laser light of the present invention, one of characteristics that have are to utilize ultra wide band chaotic laser as detectable signal, by the adjusting to the laser instrument inner parameter, realize the spectral characteristic flexible and controllable of ultra-wideband microwave signal, improve the direction of UWB radar and angle rate respectively greatly, thereby realized accurate location and little feature detection of target object; Two of the characteristics that have are that the ultra wide band chaotic lasing light emitter is based on the nonlinear effect of semiconductor laser, utilize two laser instruments that the two feedbacks of associating realize the optical chaos ultra-broadband signal that inject; Three of the characteristics that have are to inject light intensity and are controlled by the light adjustable attenuator between semiconductor laser, feedback light intensity is jointly controlled by coupling mechanism and adjustable attenuator, finally realized the centre frequency continuous variable, the ultra wide band chaotic signal that high bandwidth and signal spectrum are controlled.
Apparatus of the present invention combine UWB microwave signal transmit-receive technology and chaos auto-correlation ranging technology, have finally realized being used for millimeter level high resolving power ultra broadband (UWB) the chaos random signal acquisition radar system in fields such as resource detection, the Non-Destructive Testing of historical relic, military anti-terrorism and post-disaster search and rescue.
A kind of ultra-broadband wall-through radar detection apparatus based on chaotic laser light proposed by the invention is compared also with other ULTRA-WIDEBAND RADAR device and is had the following advantages:
(1) ultra-broadband signal that produces based on chaotic laser light have that power spectrum is smooth, bandwidth, low in energy consumption, do not have fuzzy advantage, can realize high range resolution, and antijamming capability is strong;
(2) in conjunction with UWB microwave signal transmit-receive technology and chaos random signal auto-correlation processing technology, implement device is simple and easy, stable, high resolving power, high-precision UWB chaos random signal acquisition radar system;
(3) the present invention utilizes two two feedback chaos laser instruments of associating that inject, by to laser instrument and the adjusting of injecting light, feedback light, realize the spectral characteristic flexible and controllable of UWB microwave signal in the light territory, thereby produce tunable, the adjustable ultra wide band chaotic microwave signal of signal spectrum bandwidth of centre frequency, make this device can be towards different field of detecting.
Description of drawings
Fig. 1 is structural representation of the present invention.Among the figure, 1: ultra wide band chaotic lasing light emitter, 2: electrooptic modulator, 3: fiber coupler, 4a: first photodetector, 4b: second photodetector, 5: prime amplifier, 6: emitting antenna, 7a: first receiving antenna, 7b: second receiving antenna, 8a: first low noise amplifier, 8b: second low noise amplifier, 9a: the first synchronous acquisition system, 9b: the second synchronous acquisition system, 10a: first digital correlator, 10b: second digital correlator, 11: data handling system, 12: display, 13: clock, 14: the quick vairable delay line of light.
Fig. 2 is the two structural representations that inject the two feedback chaos laser instruments of associating of the present invention.Among the figure, 1a:FP laser instrument, 1b:DFB laser instrument I, 1c:DFB laser instrument II, 2a: polarizer I, 2b: polarizer II, 2c: polarizer III, 2d: polarizer IV, 3a: variable attenuator I, 3b: variable attenuator II, 3c: variable attenuator III, 3d: variable attenuator IV, 4a: coupling mechanism I, 4b: coupling mechanism II, 4c: coupling mechanism III, 4d: coupling mechanism IV, 4e: coupling mechanism V, 5: optical fiber circulator.
Embodiment
Below the specific embodiment of the present invention is made an explanation:
Implement the ultra-broadband wall-through radar detection apparatus based on chaotic laser light of the present invention, constituted by transmitting terminal and receiving end, at transmitting terminal, comprise ultra wide band chaotic lasing light emitter 1, electrooptic modulator 2, fiber coupler 3, the first photodetector 4a, prime amplifier 5, emitting antenna 6, the quick vairable delay line 14 of light and the second photodetector 4b; At receiving end, receive with identical two-way, the first via comprises the first receiving antenna 7a, the first low noise amplifier 8a, first synchronous acquisition system 9a and the first digital correlator 10a; The second the tunnel comprises the second receiving antenna 7b, the second low noise amplifier 8b, second synchronous acquisition system 9b and the second digital correlator 10b, extract the characteristic information input signal disposal system 11 of two paths of signals, data are handled the specifying information that obtains object, input display 12 shows the object picture, realizes location and the two-dimensional imaging of object.Wherein, electrooptic modulator 2 all links to each other with clock signal 13 with synchronous acquisition system 9.
At first, when passing through electrooptic modulator 2, the chaotic laser light of ultra wide band chaotic lasing light emitter 1 outgoing is modulated to the chaotic laser light pulse train of cycle emission by a clock signal 13, this chaotic laser light pulse train is divided into detectable signal and reference signal through a fiber coupler 3, the chaotic laser light detectable signal injects the microwave signal that the first photodetector 4a changes ultra broadband into, is sent by wide-band microwave emitting antenna 6 after prime amplifier 5 amplifies.At receiving end, the echoed signal of target object scattering is received by the two-way receiving antenna after passing barrier: the echoed signal that the first via is received by the first receiving antenna 7a is after the first low noise amplifier 8a amplifies, gathered synchronously by the first synchronous acquisition system 9a, it is relevant with reference signal and obtain the characteristic information of target object to be input to the first digital correlator 10a then, the echoed signal that the secondary route second receiving antenna 7b receives is after the second low noise amplifier 8b amplifies, gathered synchronously by the second synchronous acquisition system 9b, it is relevant with reference signal and obtain the characteristic information of target object to be input to the second digital correlator 10b then, the two-way characteristic information input signal disposal system of extracting 11 is handled, obtain position angle and the distance of target object, input display 12 is realized detection location and the two-dimensional imaging of target object.
The chaotic laser light source 1 of the invention described above device can produce bandwidth and transmit up to the smooth ultra broadband of the power spectrum of 32GHz, apparatus of the present invention penetration thickness 10-20cm concrete walls can reach the resolution of 5mm, resolution than existing through-wall radar improves an order of magnitude, thereby realizes the little feature detection to target; And the present invention can produce that centre frequency is tunable, the adjustable ultra wide band chaotic microwave signal of signal spectrum bandwidth, makes this device can be towards different field of detecting.Can be used for fields such as the Non-Destructive Testing of personnel's relief after the calamity, military affairs, anti-terrorism, historical relic and life detection.
For the embodiment of better explanation a kind of ultra-broadband wall-through radar detection apparatus based on chaotic laser light provided by the present invention, make further instruction below in conjunction with accompanying drawing 1.
As Fig. 1, be modulated to the chaotic laser light pulse train of cycle emission during through electrooptic modulator by a clock signal 13 by the chaotic laser light of ultra wide band chaotic lasing light emitter 1 outgoing, this chaotic laser light pulse train is divided into detectable signal and reference signal two-way through a fiber coupler 3, the chaotic laser light detectable signal injects the microwave signal that a photodetector 4a changes ultra broadband into, after amplifying, sent by the ultra-wideband microwave emitting antenna prime amplifier 5, the ultra-wideband microwave signal has strong penetration performance, can pass obstacle detection to target object.The echoed signal of target object scattering is received by two-way after passing barrier, the echoed signal that the first via first receiving antenna 7a receives is after low noise amplifier 8a amplifies, gathered synchronously by synchronous acquisition system 9a, be input to digital correlator 10a then and through the relevant and characteristic information of acquisition target object of the reference signal that becomes electric signal behind the quick vairable delay line 14 of light and the photodetector 4b; The echoed signal that the second tunnel second receiving antenna 7b receives is after the second low noise amplifier 8b amplifies, gathered synchronously by the second synchronous acquisition system 9b, be input to the second digital correlator 10b and the characteristic information of acquisition target object relevant with the reference signal that becomes electric signal through the quick vairable delay line 14 of light and photodetector 4b then, the two-way characteristic information input signal disposal system of extracting 11 is handled, obtain position angle and the distance of target object, realize detection location and the two-dimensional imaging of target object, at last, input display 12 shows the object picture.
Claims (2)
1. ultra-broadband wall-through radar detection apparatus based on chaotic laser light, constituted by transmitting terminal and receiving end, the transmission antennas transmit ultra-wideband microwave signal that it is characterized in that transmitting terminal passes barrier arrival object, and the back is by the object reflection, and reflected signal is received and handled by the receiving end antenna;
Described transmitting terminal is the chaotic laser light pulse train that is modulated to the cycle emission by ultra wide band chaotic lasing light emitter (1) emission chaotic laser light through the electrooptic modulator (2) of a clock (13) control, and be divided into through fiber coupler (3) and survey light and reference light II, survey light and change electric signal through first photodetector (4a) into by light signal, after prime amplifier (5) amplifies, sent by emitting antenna (6);
Described receiving end is received by two-way, the first via receives echoed signal by first receiving antenna (7a), after first low noise amplifier (8a) amplifies, gather signal by the first synchronous acquisition system (9a), import first digital correlator (10a) with through the relevant and characteristic information of acquisition target object of the reference signal that changes electric signal behind the quick vairable delay line of light (14) and second photodetector (4b) into; Secondary route second receiving antenna (7b) receives echoed signal, after second low noise amplifier (8b) amplifies, gather signal by the second synchronous acquisition system (9b), import second digital correlator (10b) with relevant and obtain the characteristic information of target object through the reference signal that changes electric signal behind the quick vairable delay line of light (14) and second photodetector (4b) into, extract then the two-way characteristic information be input to signal processing system (11) data handle after input displays (12) demonstration.
2. the ultra-broadband wall-through radar detection apparatus based on chaotic laser light as claimed in claim 1 is characterized in that ultra wide band chaotic lasing light emitter (1) is that two two feedback semiconductor lasers of associating that inject produce.
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| CN110794416B (en) * | 2019-10-18 | 2023-04-11 | 广东工业大学 | Photon millimeter wave noise radar |
| CN111142076B (en) * | 2020-01-06 | 2023-09-05 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Power control method for improving radar low-interception performance |
| CN111555809B (en) * | 2020-03-30 | 2023-02-28 | 太原理工大学 | Photo-generated millimeter wave noise generator |
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| CN111751827B (en) * | 2020-06-03 | 2024-04-02 | 之江实验室 | Microwave photon radar detection method and system based on light injection frequency modulation |
| CN114509749A (en) * | 2022-04-19 | 2022-05-17 | 亿慧云智能科技（深圳）股份有限公司 | Indoor positioning detection system and method |
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