Method for imaging stationary transmitter bistatic foresight synthetic aperture radar (ST-BFSAR)

Abstract

The invention discloses a method for imaging a stationary transmitter bistatic foresight synthetic aperture radar (ST-BFSAR). The method comprises the following specific steps: after obtaining a target echo, rectifying a two-dimensional space variant of a distance migration of the ST-BFSAR by using first-order Keystone transform, wherein an object which has a same bistatic distance sum at a slow time zero moment is moved to a same distance gate during the operation; and after the distance migration rectification is accomplished, balancing the Doppler chirp scaling of an object in the same distance gate by using a non-linear chirp scaling variant object so as to eliminate the space variant of the Doppler chirp scaling along a directional bit and accomplishing the directional bit compression, so that the precise focusing of the ST-BFSAR is realized, and the problem that the two-dimensional space variant during the data treatment of the ST-BFSAR cannot be solved by using a traditional SAR (Synthetic Aperture Radar) imaging method and an existing bistatic foresight SAR imaging method is solved.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an imaging method of a fixed transmitting station bistatic forward-looking SAR in the synthetic aperture radar imaging technology. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in the fields of terrain surveying and mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, resource exploration, and detection of small changes in the earth's crust. However, due to the limitation of its own working system, the existing single-base SAR cannot realize high-resolution imaging of the forward-looking area of ​​the aircraft, so that the SAR technology ...

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Problems solved by technology

[0008] The purpose of the present invention is to aim at the defect that background technology exists, research and design a kind of bistatic forward-looking synthetic aperture radar imaging method of fixed transmitting station, solve traditional SAR imaging method and existing bistatic forward-looking SAR imaging method and can not solve ST-BFSAR data When dealing with the problem of two-dimensional space variation, realize the precise focus imaging of ST-BFSAR

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