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Bistatic forward-looking SAR (Synthetic Aperture Radar) motion compensation method

A motion compensation, bistatic technology, applied in the field of radar, can solve the problem of data block and reduce the processing efficiency, and achieve the effect of fast speed, high compensation accuracy, and accurate compensation and focusing.

Active Publication Date: 2015-12-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, this method is only suitable for situations where the azimuth range does not change much, and the data block also reduces the processing efficiency

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  • Bistatic forward-looking SAR (Synthetic Aperture Radar) motion compensation method
  • Bistatic forward-looking SAR (Synthetic Aperture Radar) motion compensation method
  • Bistatic forward-looking SAR (Synthetic Aperture Radar) motion compensation method

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Embodiment Construction

[0055] In order to describe content of the present invention conveniently, at first the following terms are explained:

[0056] Term 1: bistatic forward-looking SAR (bistaticforward-lookingSAR)

[0057] Bistatic forward-looking SAR refers to a SAR system in which the transmitting station and receiving station of the system are placed on different platforms, and the receiving station images the area directly in front of it. At least one of the platforms is a moving platform, which is conceptually a bistatic radar.

[0058] Term 2: Motion Error Azimuth Spatial Variation

[0059] The space-variation of motion error and azimuth means that targets at different azimuth positions in the same range gate have different motion error compensation functions.

[0060] Such as figure 1 Shown is the method flowchart of the present invention, a kind of bistatic forward-looking SAR motion compensation method of the present invention, mainly comprises the following steps:

[0061] S0: The ec...

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Abstract

The invention discloses a bistatic forward-looking SAR (Synthetic Aperture Radar) motion compensation method. Azimuth-slow time decoupling operation is adopted, and different azimuth point targets in the same distance unit are separated and processed. The method mainly comprises steps of: (1) space-invariant motion error compensation; (2) distance focus processing; (3) distance space-variant motion error compensation; (4) azimuth space-variant motion error compensation; and (5) azimuth compression. The problem that the traditional SAR motion compensation method and the existing bistatic SAR motion compensation method are hard to correct motion error azimuth space variance can be overcome. The motion error azimuth space variance can be effectively removed, and precise compensation and focusing of the bistatic forward-looking SAR can be realized.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a motion compensation method in a bistatic forward-looking synthetic aperture radar (SAR). Background technique [0002] Synthetic Aperture Radar (SAR) is an all-time, all-weather high-resolution microwave remote sensing imaging radar. SAR has played an increasingly important role in the fields of military reconnaissance, topographic mapping, ocean and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of crustal changes. However, in the forward-looking area of ​​the aircraft, because the traditional monostatic SAR cannot form the orthogonality between the equidistance line and the iso-Doppler line, and there is a Doppler ambiguity problem, it does not have the forward-looking imaging capability in mechanism. [0003] The bistatic forward-looking SAR adopts the working mode of transmitting and receiving separately, which can form ...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9043G01S13/9019G01S13/9058
Inventor 武俊杰蒲巍黄钰林李文超杨建宇杨海光杨晓波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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