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High-resolution wide-swath SAR moving target speed estimation and imaging method

A technology of velocity estimation and imaging method, applied in the field of radar, which can solve problems such as large amount of calculation

Active Publication Date: 2017-10-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The present invention overcomes the shortage of the large calculation amount of the moving target velocity estimation method in the existing HRWS SAR moving target imaging, and makes up for the defect that the existing method can only estimate the range velocity of the moving target, and suppresses the impact of the azimuth velocity of the moving target on the imaging results. influence; by applying the Lu's distribution (LVD) method to HRWS SAR moving target imaging, the range and azimuth velocity of the moving target can be efficiently estimated, and the high-resolution moving target imaging

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Embodiment Construction

[0065] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0066] In order to describe content of the present invention conveniently, at first do following term definition:

[0067] Definition 1. HRWS multi-channel model moving target slant distance

[0068] The i-th channel slows down time t in azimuth m The time slant distance is

[0069]

[0070] Among them, R 0 is the shortest slope distance, v r is the distance velocity of moving target, V s is the platform velocity, d i is the distance between the i-th channel and the reference channel.

[0071] Definition 2. Space Time Adaptive Processing (STAP) method

[0072] STAP processing can be expressed as:

[0073] the s stap (a,r)=w H (a,r)s r (a,r) (2)

[0074] Among them, w(a,r) is the weight vector, s r is the data after range compressi...

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Abstract

The invention discloses a high-resolution wide-swath SAR moving target speed estimation and imaging method. The method is characterized by, under a high-resolution wide-swath azimuth multichannel model, carrying out clutter suppression on data obtained after multichannel range compression by utilizing a space-time adaptive processing method; then, estimating distance and azimuth velocity of a moving target through a Lv's distribution method; suppressing azimuth ambiguity of the moving target by utilizing the distance velocity of the moving target; and finally, realizing high-resolution imaging through a back-projection algorithm (BP) and the distance and azimuth velocity of the moving target.

Description

technical field [0001] The invention belongs to the field of radar technology, and in particular relates to a moving target detection and imaging technology under a high-resolution wide-range SAR system, that is, a GMTI technology. Background technique [0002] High Resolution Wide SAR (HRWS, High Resolution Wide Swath, High Resolution Wide; SAR, Synthetic Aperture Radar, Synthetic Aperture Radar) is a SAR imaging technology that can simultaneously obtain high resolution and wide swaths, and can be applied to land planning , marine monitoring, map drawing and other imaging that require large area and high precision. Moving target imaging under high resolution and wide format can be applied to vehicle detection in transportation and battlefield reconnaissance information, etc., which plays an important role. Among them, the accurate estimation of moving target velocity is the key premise of its high-quality imaging, so building a high-performance moving target velocity estim...

Claims

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Application Information

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IPC IPC(8): G01S13/58G01S13/90
CPCG01S13/589G01S13/904G01S13/9041G01S13/9047G01S13/9029G01S13/9004
Inventor 刘喆田立俊赵伟宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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