CN104678390A - Ultra-wideband direct chaotic speed-measuring and ranging radar device based on heterodyne correlation method - Google Patents
Ultra-wideband direct chaotic speed-measuring and ranging radar device based on heterodyne correlation method Download PDFInfo
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- CN104678390A CN104678390A CN201510104133.8A CN201510104133A CN104678390A CN 104678390 A CN104678390 A CN 104678390A CN 201510104133 A CN201510104133 A CN 201510104133A CN 104678390 A CN104678390 A CN 104678390A
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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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Abstract
The invention discloses an ultra-wideband direct chaotic speed-measuring and ranging radar device based on a heterodyne correlation method. The ultra-wideband direct chaotic speed-measuring and ranging radar device is characterized in that a chaotic signal generated by a ultra-wideband chaotic generator is directly taken as a radar signal and is divided into three ways of in-phase components by a wideband power splitter, wherein the first way is taken as a detection signal and is transmitted by a broadband ridged horn antenna; the second way is mixed with an intrinsic signal generated by a signal generator and is taken as a reference signal I; the third way is taken as a reference signal II, is directly inputted to a data acquisition and processing unit and is subjected to cross-correlation processing with echo signals. A target scattering signal and a clutter signal are taken as the echo signals to be received by the broadband ridged horn antenna, each of echo signals is divided into two ways of in-phase components; the first way is directly inputted into the data acquisition and processing unit to be subjected to data acquisition and related processing; the second way is subjected to heterodyne processing with the reference signal I and is inputted to an I/Q frequency mixer firstly and then the data acquisition and processing unit to be acquired; the speed information of a target is extracted from an output signal.
Description
Technical field
The present invention relates to radar detection apparatus technical field, particularly relate to the direct chaos of a kind of ultra broadband based on heterodyne correlation method and to test the speed range radar device, can be applicable to the field such as remote sensing, investigation.
Background technology
Along with the fast development of infotech, radar has become the indispensable instrument such as modern communications, military guarantee.Under multiple complex jamming environment, various application it is also proposed higher requirement to radar, that is: precision is high, antijamming capability strong, multiple target tracking, multi-path jamming are little, adaptive performance is good, so derived ULTRA-WIDEBAND RADAR thereupon.ULTRA-WIDEBAND RADAR refers to that bandwidth of operation is more than or equal to the radar of its centre frequency 25%.Compared with Narrow-band Radar, the advantage of ULTRA-WIDEBAND RADAR is, transfer rate is high; Security and good confidentiality, have very strong disguise, is difficult to be intercepted and captured; Positioning precision is high, and system range resolution is high; Multi-path resolved ability is strong; Low in energy consumption etc.So sight is focused on research and the design of ULTRA-WIDEBAND RADAR by increasing researchist.
In the research and design of ULTRA-WIDEBAND RADAR, the design of waveform with select directly to affect the target information amount obtained, particularly spatially extended target.Design suitable waveform to need to consider factors, as: restriction of range resolution, DOPPLER RESOLUTION, acquisition environment, system cost and applying frequency etc.
Chaotic signal is noise-like signal, responsive, controlled to initial value, frequency spectrum is wide, there are ultra broadband characteristic and good correlation properties, high Distance geometry DOPPLER RESOLUTION, strong anti-interference, strong anti-multipath fading, strong electronic anti-jamming and good target identification etc. can be realized in radar application.So ultra wide band chaotic radar becomes the study hotspot of new system radar.
Ultra wide band chaotic signal can be produced by electrical domain or area of light system.Current electrical domain chaotic signal can be produced by mimic channel, as: follow-on Colpitts chaotic oscillating circuit.The mode that area of light chaotic signal can be fed back by light, electro-optical feedback or light inject produces chaos light, then by photoelectric commutator, light signal is converted into electric signal and carries out target detection.Two kinds of modes respectively have superiority, and chaotic signal centre frequency and the bandwidth of the generation of area of light system are controlled flexibly, and bandwidth can up to tens of GHz; The chaotic signal amplitude that electrical domain system produces is large, is combined that can to reach centre frequency controlled flexibly with frequency mixer, and product low cost.
2004, the chaotic laser light that the people such as the Liu Jiaming of University of California in Los Angeles utilize semiconductor laser to produce, as radar emission signal after opto-electronic conversion, for extraterrestrial target range finding (IEEE Journal of Quantum Electronics, 40 (6), 815-820,2004 and IEEE Journal of Quantum Electronics, 40 (6), 682-689,2004); 2007 to 2010, the history of the people from Zhejiang University such as to manage state affairs have studied chaotic signal that Colpitts circuit produces antijamming capability (the Progress In Electromagnetics Research as radar signal, 77,1-14,2007), and applied to emulation and experiment (the Progress In Electromagnetics Research of object ranging, 90,15-30,2009 and Journal of Electromagnetics Waves and Application, 24,1229-1239,2010); Since 2008, the Wang Yun ability seminar of Institutes Of Technology Of Taiyuan has carried out analyzing (infrared and laser engineering to chaotic laser light anti-jamming ability of radar, 36 (z1), 214-218,2007 and Chinese laser, 38 (5), 0514002,2011) and be applied to multi-Goal Measure (Chinese Optics Letters, 11,868-870,2008) and automobile collision preventing (Chinese laser, 36 (9), 2426-2430,2009) field such as.These chaotic radars be all using chaotic signal directly as radar signal, be called direct chaotic radar.In addition, Canada's McMaster University, the researcher of the research institutions such as domestic Institutes Of Technology Of Nanjing, Nanjing Aero-Space University, University of Electronic Science and Technology, Xian Electronics Science and Technology University, Guilin Electronic Science and Technology Univ., BJ University of Aeronautics & Astronautics using chaotic signal as modulation signal, as radar emission waveform after modulating continuous wave or pulse signal, be called chaotic modulation radar.
There are some researches show the direct chaotic radar of ultra broadband can be used for space or barrier after object ranging, because these radar systems adopt traditional directly related method to detect, therefore the range information of target can only be extracted, and lost the phase information of target, cannot test the speed by realize target.And utilize direct chaotic radar carry out target test the speed just by emulation carried out verifying (Radar Conference 2013, IET International, 1-5,2013), and employing software approach, be about to transmit carry out matched filtering with the Fourier transform of echoed signal after adopt MUSIC Power estimation algorithm obtain the Doppler shift of target thus calculate the speed of target.The direct chaotic radar object ranging of hardware implementing is utilized not yet to have bibliographical information.
Summary of the invention
The direct chaos of a kind of ultra broadband based on heterodyne correlation method is the object of the present invention is to provide to test the speed range radar device, adopt heterodyne correlation method, ultra wide band chaotic signal generator is utilized to produce chaotic signal, extract range information and the phase information of target simultaneously, thus the Distance geometry speed detection of realize target.
The present invention adopts following technical scheme to realize:
The direct chaos of ultra broadband based on heterodyne correlation method tests the speed a range radar device, comprises transmitting terminal, receiving end, data acquisition and processing (DAP) unit.
Described transmitting terminal produces chaotic signal by ultra wide band chaotic signal generator, is divided into three tunnel in-phase components through the first broadband power divider: the first via, as detectable signal, after the first power amplifier amplifies, is launched by Wide Band Ridged Horn Antenna; After second tunnel and signal generator I pass through the first frequency mixer mixing by the road local oscillation signal that the second broadband power divider produces, as reference signal I, and heterodyne process will be carried out with echoed signal; 3rd tunnel, as with reference to signal II, is directly inputted to data acquisition and processing (DAP) unit and gathers, and will carry out relevant treatment with echoed signal, for extracting the range information of target.
Described receiving end, signal and the noise signal of target scattering are received by Wide Band Ridged Horn Antenna as echoed signal, echoed signal is after low noise amplifier, two-way in-phase component is divided into: the first via and reference signal I carry out heterodyne process by the second frequency mixer by the 3rd broadband power divider, again through bandpass filter, I/Q frequency mixer is input to after second power amplifier, another road local oscillation signal that signal generator I is produced by the second broadband power divider is input to I/Q frequency mixer, then I/Q frequency mixer output two paths of signals carries out acquisition and processing to data acquisition and processing (DAP) unit, extract the phase information of target, thus obtain the velocity information of target, second tunnel directly inputs data acquisition and processing (DAP) unit and gathers, and carries out relevant treatment with reference signal II, extracts the range information of target.
The principle of work of heterodyne correlation method is the frequency by changing the chaotic signal that ultra wide band chaotic signal generator produces, itself and echoed signal is made to produce a difference on the frequency, after frequency conversion reference signal I relevant to echoed signal after, containing phase-modulation phase and tested quantifier (phase information etc. of target) in the signal produced, measured target information can be obtained by carrying out demodulation to this signal.When signal is demodulated to base band, signal is exaggerated, and decreases the impact that flicker noise produces.
Described ultra wide band chaotic signal generator can be electrical domain system or area of light system.
Described electrical domain system is made up of follow-on Colpitts chaotic oscillating circuit, frequency mixer and signal generator.
Described area of light system adopts the unidirectional Semiconductor Lasers of outer light.
Should to test the speed range radar device based on direct chaos of ultra broadband of heterodyne correlation method, not only can realize high-resolution object ranging, can extract the phase information of target simultaneously, calculate the speed of target, its advantage and beneficial effect embody a concentrated reflection of as follows:
1, based on modified Coliptts chaotic oscillating circuit (electrical domain system) with based on the chaotic signal that the mode (area of light system) that light feedback, electro-optical feedback or light inject produces, there is wide bandwidth, without the advantage such as fuzzy, low in energy consumption, range resolution can be realized and DOPPLER RESOLUTION is high, antijamming capability strong and anti-multipath fading ability is strong target detection; In addition, the mode of electrical domain system generation chaos is simple, system stability, cost are low, and the chaotic signal that area of light system produces has smooth power spectrum and the bandwidth up to tens of GHz.
2, in conjunction with ultra-wideband microwave signal transmitting and receiving technology, heterodyne correlation method and quadrature demodulation method, device realizes the Distance geometry velocity measuring to target simultaneously, and not by the impact of random phase.
The present invention is reasonable in design, adopts heterodyne correlation method, utilizes ultra wide band chaotic signal generator to produce chaotic signal, extracts range information and the phase information of target simultaneously, thus the Distance geometry speed detection of realize target, can be applicable to the field such as remote sensing, investigation.
Accompanying drawing explanation
Fig. 1 is the structural representation of device of the present invention.
Fig. 2 is the structural representation of ultra wide band chaotic generator electrical domain system of the present invention.
Fig. 3 is the structural representation of ultra wide band chaotic generator area of light system of the present invention.
In figure, 1-ultra wide band chaotic signal generator, 1a-modified Colpitts chaotic oscillating circuit, 1b-three-mixer, 1c-signal generator II, 1A-first semiconductor laser, 1B-Polarization Controller, 1C-fiber coupler, 1D-adjustable optical attenuator, 1E-second semiconductor laser, 1F-fibre optic isolater, 1G-photoelectric commutator, 2a-first broadband power divider, 2b-second broadband power divider, 2c-the 3rd broadband power divider, 3a-first power amplifier, 3b-second power amplifier, 4a-first frequency mixer, 4b-second frequency mixer, 5a-broadband ridged horn emitting antenna, 5b-broadband ridged horn receiving antenna, 6-low noise amplifier, 7-bandpass filter, 8-I/Q frequency mixer, 9-data acquisition and processing (DAP) unit, 10-signal generator I.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The chaotic signal (GHz magnitude) that ultra wide band chaotic signal generator produces is divided into three tunnel in-phase components through broadband power divider: a road is as detectable signal; Local oscillation signal (MHz magnitude) mixing that one tunnel and signal generator I produce, as with reference to signal I, carries out heterodyne process with echoed signal; Relevant treatment, as with reference to signal II, is carried out with echoed signal in another road.The echoed signal received merit after low noise is amplified divides two-way: a road and reference signal I carry out heterodyne process, I/Q frequency mixer is input to again after bandpass filter, power amplifier, then enter data acquisition and processing (DAP) unit and carry out Signal sampling and processing, extract the phase information of target in signal; Another road directly inputs data acquisition and processing (DAP) unit, does cross correlation process with reference signal II, extracts the range information of target in signal.In order to device of the present invention is described better, the present invention is described in further detail.
As shown in Figure 1, the direct chaos of the ultra broadband based on heterodyne correlation method tests the speed range radar device, comprises transmitting terminal, receiving end and data acquisition and processing (DAP) unit 9.
Described transmitting terminal produces chaotic signal by ultra wide band chaotic signal generator 1, is divided into three tunnel in-phase components through the first broadband power divider 2a: the first via, as detectable signal, after the first power amplifier 3a amplifies, is launched by Wide Band Ridged Horn Antenna 5a; The road local oscillation signal that second tunnel and signal generator I 10 are produced by the second broadband power divider 2b passes through the first frequency mixer 4a mixing, as reference signal I, and will carry out heterodyne process with echoed signal; 3rd tunnel, as with reference to signal II, is directly inputted to data acquisition and processing (DAP) unit 9 and gathers, and will carry out relevant treatment with echoed signal, extracts the range information of target.
Wherein, described ultra wide band chaotic signal generator 1 is electrical domain system or area of light system.
As shown in Figure 2, described electrical domain system is made up of follow-on Colpitts chaotic oscillating circuit 1a, frequency mixer 1b and signal generator 1c; The ultra wide band chaotic signal that modified Colpitts chaotic oscillating circuit 1a produces and the signal that signal generator II 1c produces, after three-mixer 1b frequency conversion, export chaotic signal.
As shown in Figure 3, described area of light system adopts the unidirectional Semiconductor Lasers of outer light; Namely the continuous light of the first semiconductor laser 1A output is successively through Polarization Controller 1B, fiber coupler 1C and adjustable optical attenuator 1D, enter the second semiconductor laser 1E again, disturbance is caused to the second semiconductor laser 1E, thus generation chaotic laser light, input in photoelectric commutator 1G through fibre optic isolater 1F, chaos light is converted into continuous chaotic signal and exports.
Described receiving end, the signal of target scattering and noise signal are received by Wide Band Ridged Horn Antenna 5b as echoed signal, echoed signal is after low noise amplifier 6, two-way in-phase component is divided into: the first via and reference signal I carry out heterodyne process by the second frequency mixer 4b by the 3rd broadband power divider 2c, again through bandpass filter 7, I/Q frequency mixer 8 is input to after second power amplifier 3b, another road local oscillation signal that signal generator I 10 is produced by the second broadband power divider 2b is input to I/Q frequency mixer 8, then I/Q frequency mixer 8 exports two paths of signals (I and Q, see formula 9) carry out acquisition and processing to data acquisition and processing (DAP) unit 9, extract the phase information of target, thus the velocity information of target is obtained by formula (10), second tunnel directly inputs data acquisition and processing (DAP) unit 9 and gathers, and carries out relevant treatment with reference signal II, extracts the range information of target, and the acquisition of range information belongs to conventional radar method.
In conjunction with formula, acquisition target speed information is done and illustrates as follows:
Suppose that the chaotic signal that ultra wide band chaotic signal generator 1 produces is
Wherein a (t) represents that chaotic signal is the amplitude of Gaussian distribution, ω
0represent the angular frequency of signal,
represent the centre frequency of chaotic signal,
represent the half of signal frequency bandwidth,
represent the arbitrary phase of signal.
The signal that signal generator I 10 produces
(2) x
1(t)＝cosω
reft；
Wherein
for the frequency of signal, for the sake of simplicity, suppose that the initial phase of local oscillation signal is zero.
After chaotic signal and reference signal mixing, obtaining reference signal I is
Wherein k
1it is constant.
Wide Band Ridged Horn Antenna 5b receives echoed signal
Wherein k
2be constant, ρ represents the reflection amplitude coefficient of target,
represent the reflected phase will of target, R represents that chaotic signal reflects through target the distance having receiving antenna to receive after launching, and c represents the velocity of propagation of electromagnetic wave in space, and v represents the translational speed of target,
represent that chaotic signal reflects through target the time delay having receiving antenna to receive after launching.
The instantaneous phase of Received signal strength can be expressed as
Wherein instantaneous wavelength
Because distance (5) R=vt, so bring in formula (4),
After echoed signal and reference signal I mixing, the output signal of the second frequency mixer 4b is
Wherein k
3it is constant.
After I/Q frequency mixer 8, export two paths of signals:
Wherein k
i, k
qit is constant.
Carry out relevant treatment in data acquisition and processing (DAP) unit 9 after, then the phase information of target is expressed as
The velocity information of target is obtained by formula (10).
Claims (4)
1. to test the speed a range radar device based on the direct chaos of ultra broadband of heterodyne correlation method, comprise transmitting terminal, receiving end and data acquisition and processing (DAP) unit (9), it is characterized in that:
Described transmitting terminal produces chaotic signal by ultra wide band chaotic signal generator (1), three tunnel in-phase components are divided into: the first via is as detectable signal through the first broadband power divider (2a), after the first power amplifier (3a) amplifies, launched by Wide Band Ridged Horn Antenna (5a); The road local oscillation signal that second tunnel and signal generator I (10) are produced by the second broadband power divider (2b), by the first frequency mixer (4a) mixing, as with reference to signal I, and will carry out heterodyne process with echoed signal; 3rd tunnel, as with reference to signal II, is directly inputted to data acquisition and processing (DAP) unit (9) and gathers, and will carry out relevant treatment with echoed signal, for extracting the range information of target;
Described receiving end, the signal of target scattering and noise signal are received by Wide Band Ridged Horn Antenna (5b) as echoed signal, echoed signal is after low noise amplifier (6), two-way in-phase component is divided into: the first via and reference signal I carry out heterodyne process by the second frequency mixer (4b) by the 3rd broadband power divider (2c), again through bandpass filter (7), I/Q frequency mixer (8) is input to after second power amplifier (3b), another road local oscillation signal that signal generator I (10) is produced by the second broadband power divider (2b) is input to I/Q frequency mixer (8), then I/Q frequency mixer (8) output two paths of signals carries out acquisition and processing to data acquisition and processing (DAP) unit (9), extract the phase information of target, thus obtain the velocity information of target, second tunnel directly inputs data acquisition and processing (DAP) unit (9) and gathers, and carries out relevant treatment with reference signal II, extracts the range information of target.
2. the direct chaos of the ultra broadband based on heterodyne correlation method according to claim 1 tests the speed range radar device, it is characterized in that: described ultra wide band chaotic signal generator (1) is electrical domain system or area of light system.
3. the direct chaos of the ultra broadband based on heterodyne correlation method according to claim 2 tests the speed range radar device, it is characterized in that: described electrical domain system is made up of follow-on Colpitts chaotic oscillating circuit (1a), frequency mixer (1b) and signal generator (1c); The ultra wide band chaotic signal that modified Colpitts chaotic oscillating circuit (1a) produces and the signal that signal generator II (1c) produces, after three-mixer (1b) frequency conversion, export chaotic signal.
4. the direct chaos of the ultra broadband based on heterodyne correlation method according to claim 2 tests the speed range radar device, it is characterized in that: described area of light system adopts the unidirectional Semiconductor Lasers of outer light; Namely the continuous light that exports of the first semiconductor laser (1A) is successively through Polarization Controller (1B), fiber coupler (1C) and adjustable optical attenuator (1D), enter the second semiconductor laser (1E) again, disturbance is caused to the second semiconductor laser (1E), thus generation chaotic laser light, input in photoelectric commutator (1G) through fibre optic isolater (1F), chaos light is converted into continuous chaotic signal.
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| CN112230209A (en) * | 2020-09-28 | 2021-01-15 | 北京环境特性研究所 | Remote double-station RCS measuring device and method |
| CN112230209B (en) * | 2020-09-28 | 2023-06-16 | 北京环境特性研究所 | Remote double-station RCS measuring device and method |
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| CN113534178A (en) * | 2021-07-13 | 2021-10-22 | 西南大学 | Rapid correlation calculation method for ultra-wideband optical chaotic ranging |
| CN113933852A (en) * | 2021-10-13 | 2022-01-14 | 西南大学 | Photoelectric dual-mode anti-interference distance measuring device and method based on broadband chaotic correlation method |
| CN113933852B (en) * | 2021-10-13 | 2022-07-19 | 西南大学 | Photoelectric dual-mode anti-interference distance measuring device and method based on broadband chaotic correlation method |
| 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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