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Moving target detection method based on multiple sub-apertures of single-channel SAR

A moving target and detection method technology, applied in the field of radar, can solve problems such as lack of clutter suppression performance and target detection, insufficient information utilization, and difficulty in eliminating clutter

Inactive Publication Date: 2010-10-13
CHONGQING UNIV
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Problems solved by technology

[0004] The existing technologies all take a completed synthetic aperture radar echo signal as the research object, and the utilization of the information is not sufficient enough, it is difficult to directly eliminate the clutter, and it is lacking in clutter suppression performance and target detection

Method used

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  • Moving target detection method based on multiple sub-apertures of single-channel SAR
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  • Moving target detection method based on multiple sub-apertures of single-channel SAR

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Embodiment Construction

[0049] In this embodiment, an airborne radar is adopted, the bandwidth of the radar transmission signal is 200 MHz, and the pulse repetition frequency is 500 Hz. The flying speed of the carrier aircraft is 200m / s. The simulation imaging scene contains two moving targets, and the clutter spectrum bandwidth is 200MHz.

[0050] Step 1: Generation of image sequence in single channel

[0051] In synthetic aperture radar systems, the total synthetic aperture is usually divided into two or more views in the time domain or the frequency domain. Obtaining sub-images by processing the SAR image in the time domain is to segment the time-domain echo data, which is equivalent to dividing the full synthetic aperture into some sub-apertures, and then processing each sub-aperture. Since the echo signal received at the same time is the sum of the target signals at different positions in the scene, the time-domain data is simply processed in sections, and each time period will contain aliased sign...

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Abstract

The invention provides a moving target detection method based on multiple sub-apertures of a single-channel SAR, which belongs to the technical field of moving target detection. The method comprises the following steps: acquiring sub-apertures corresponding to sub-images based on division of an SAR image in azimuth spectrum, and correcting amplitude and phase errors of different sub-images in a two-dimensional adaptive method, thereby realizing rectification of the sub-apertures; acquiring space information of the sub-apertures in the azimuth direction through equalizing changes of the time delay of the sub-apertures corresponding to changes in the slope distance into location differences in different azimuth directions at one moment, and then obtaining the amount of space-time two-dimensional information in combination of pulse data accumulated by the sub-apertures in the time domain; and realizing clutter suppression and target detection through space-time adaptive processing algorithms based on the previous steps. The invention can overcome the defect that the single channel is insufficient in clutter suppression, and solves the problems of the multi-channel SAR such as large amount of operation, high complexity and the like. Therefore, the method can effectively realize the detection of the moving target, and can be applied in the moving target detection of the single-channel SAR image.

Description

Technical field [0001] The invention belongs to the field of radar technology, and particularly relates to a single-channel synthetic aperture radar (abbreviation: SAR) multi-hole moving target detection method. Background technique [0002] Ground slow-moving target detection (SAR / GMTI) based on synthetic aperture radar has a wide range of applications in military and civil fields, and has become one of the important tasks for modern radars. There are currently a variety of radar systems including SAR-GMTI functions: APY-3 (JSTARS) system equipped on E-8 aircraft; XWEAR in Canada, RAMSES in France, Ericsson in Sweden, EL / M-2060P in Israel, and the United States TUSAR, ASARS-2 / 2A, PodSAR, etc. These devices focus on multi-antenna systems, mainly using space-time adaptive processing technology (STAP), along-track interference (ATI) and offset phase center antenna (DPCA) clutter cancellation technologies. Multi-antenna systems increase the complexity of radar equipment, and how t...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
Inventor 刘书君何伟胡小平
Owner CHONGQING UNIV
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