Interferometric inverse synthetic aperture radar (InISAR) hyperactivity target-oriented imaging and motion trail reconstruction method based on time frequency analysis

A technology of time-frequency analysis and motion trajectory, which is applied in the fields of radar imaging and signal processing, and can solve the problem of not being able to give information about the azimuth position of the target.

Active Publication Date: 2013-05-08
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

At home and abroad, some studies have been carried out on multi-target ISAR imaging by using time-frequency analysis methods, but the

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  • Interferometric inverse synthetic aperture radar (InISAR) hyperactivity target-oriented imaging and motion trail reconstruction method based on time frequency analysis
  • Interferometric inverse synthetic aperture radar (InISAR) hyperactivity target-oriented imaging and motion trail reconstruction method based on time frequency analysis
  • Interferometric inverse synthetic aperture radar (InISAR) hyperactivity target-oriented imaging and motion trail reconstruction method based on time frequency analysis

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Embodiment Construction

[0062] The geometry of the system is as figure 1 As shown, the system adopts the mode of one transmission and three receptions, and the antenna T 1 Reflected chirp signal, antenna T 1 , T 2 and T 3 Receive target echo at the same time. During the imaging time, the target to the antenna T 1 distance from R 1 change to R 1 '. Three channels are recorded into three signals, and they are processed according to the following steps.

[0063] Step S1: Eliminate the clutter interference of the stationary target and obtain the signal t m Indicates the azimuth slow time;

[0064] Step S2: On the signal obtained in step S1 Do time-frequency analysis along different range gates to obtain signals

[0065] Step S3: Repeat steps S1 and S2 for the signals of the other two channels, and the three channels obtain signals respectively and

[0066] Step S4: registration interference: for a slow time t m，j (j∈1, 2, 3, ..., q, q represents the number of pulses), obtained from...

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Abstract

The invention discloses an interferometric inverse synthetic aperture radar (InISAR) hyperactivity target-oriented imaging and motion trail reconstruction method based on a time frequency analysis, and relates to radar imaging. Due to the fact that radar is motionless, an inverse synthetic aperture radar (ISAR) eliminates and stills noise jamming to a high-pass filter through directions after pulse pressure. Signals STF1(t~, tm, f), STF2(t~, tm, f) and STF3(t~ , tm, f) of three channels after eliminating the noise jamming convert to time domain, conduct time frequency analyses along each distance door respectively, get signals and conduct rectification and interference between one slow time and moment t and three groups of signals STF1(t~, t, f), STF2(t~, t, f), and STF3(t~, t, f) which are extracted from time frequency analysis results. A threshold is used for processing interferometric phases which acquire target scattering points, a comparison with reference scattering points which are located in the middle of beams and the target scattering pints are made, and fuzzy values of drift angles of the target scattering points are achieved. Multi-baseline being combined with Chinese remainder theorem enables fuzzy ranges of drift angle measuring to expand to whole beam width, target direction locations are achieved, and instantaneous time domain imaging is achieved. The reconstruction method has effects on all slow times and moments, all imaging results are observed along tm order, and hyperactivity target motion trail reconstruction is achieved.

Description

technical field [0001] The invention relates to the technical field of radar imaging and signal processing, in particular to a method for forming an instantaneous image at any time within the beam irradiation time of multiple moving targets and realizing simultaneous positioning of multiple targets. Background technique [0002] Multi-moving target imaging has great potential in both civil and military applications, and is a hot and difficult point in SAR work. Since each moving target has its own independent speed, the Doppler course is different. Traditional ISAR imaging methods based on motion compensation are no longer applicable. At home and abroad, some researches on multi-target ISAR imaging have been carried out by using the time-frequency analysis method, but the obtained images are in the range-Doppler domain, and the position information of the target in the azimuth direction cannot be given. Available references are as follows: [0003] [1].V.C.Chen, S.Qian.Jo...

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Application Information

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IPC IPC(8): G01S17/89G01S7/48
Inventor 李道京刘波乔明潘舟浩
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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