Bistatic synthetic aperture radar (BSAR) frequency domain imaging method

Abstract

The invention discloses a bistatic synthetic aperture radar (BSAR) frequency domain imaging method which specifically comprises the following steps of: initializing parameters of an imaging system; calculating a point target echo two-dimensional spectrum; performing rough matching focusing on a TV-BSAR by utilizing a reference point two-dimensional spectrum; performing Taylor expansion on the slope distance of a transmitting station, and combining residual phase terms; performing azimuth-to-frequency Stolt transform; performing distance-to-frequency Stolt transform; and performing two-dimensional inverse Fourier transform. The method disclosed by the invention adopts the two-dimensional Stolt frequency transform which enables the echo phase after rough focusing of the BSAR in a shift variant mode to finish the linearization of the airspace and frequency domain, thereby finishing residual distance migration correction, residual secondary distance compression and residual azimuth compression. The method effectively solves the two-dimensional space-variant problem in a shift variant bistatic mode, thereby realizing the precise focusing imaging of the BSAR in a shift variant mode.

Description

Technical field [0001] The invention belongs to the field of radar technology, and specifically relates to a shift-variable bistatic SAR imaging method in a synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology. Background technique [0002] SAR is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar. SAR has played a more important role in terrain mapping, vegetation analysis, ocean and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of minor changes in the crust. An increasingly important role. [0003] Bistatic SAR has many outstanding advantages due to the separate transmission and reception. It can obtain non-backscattering information of the target, and has the characteristics of long range, concealment and strong anti-interference. In addition, since the bistatic SAR receiver does not contain high-power components, it has low power consumption, small size, and lig...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the traditional SAR imaging method and the existing bistatic imaging method cannot solve the two-dimensional space change problem of the bistatic SAR in the shift mode, and thus cannot realize the precise focusing of the bistatic SAR in the shift mode, and proposes a Bistatic Synthetic Aperture Radar Frequency Domain Imaging Method

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