Legendre-orthogonal-decomposition-baesd curve motion trajectory SAR wave-number domain imaging method

A technology of curved motion and imaging method, which is applied in the direction of radio wave measurement system, radio wave reflection/re-radiation, instruments, etc., and can solve problems affecting the accuracy of distance models
CN110208799AActive Publication Date: 2019-09-06HUAQIAO UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAQIAO UNIVERSITY
Publication Date
2019-09-06

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Abstract

The invention relates to a Legendre-orthogonal-decomposition-baesd curve motion trajectory SAR wave-number domain imaging method. The method comprises: constructing a slant range history expression ina curved motion trajectory mode by using a three-dimensional speed and a three-dimensional acceleration; carrying out polynomial expansion on the constructed slant range history expression and carrying out keeping to the fourth order; transforming an SAR echo signal corresponding to the slant range into a two-dimensional frequency domain to obtain a two-dimensional frequency spectrum; with a Legendre orthogonal polynomial, spreading the two-dimensional frequency spectrum for a distance range frequency and carrying out keeping to a third order; carrying out phase compensation based on a two-dimensional frequency spectrum developed based on Legendre and completing distance migration correction and distance range focusing; and carrying out azimuth compression in a distance-Doppler domain andcarrying out transformation in a two-dimensional time domain to obtain a focusing image. Therefore, a target imaging blurring problem at the scene edge is solved.
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Description

technical field

[0001] The invention relates to the field of radar signal processing, in particular to a SAR wave number domain imaging method for curved motion trajectories based on Legendre orthogonal decomposition. Background technique

[0002] With the rapid development of radar imaging technology, in order to meet the application requirements of different aspects, the research of curved trajectory SAR is of great significance. It is different from the uniform linear motion of the traditional SAR carrier, and the three-dimensional space brings more complex control conditions and application requirements to the SAR with the curved trajectory. Its imaging area selection is more flexible and changeable, the application requirements are more autonomous and motorized, and the synthetic aperture time reaches the order of hundreds of seconds. Curved motion makes the slant range history more complicated and increases the difficulty of SAR signal processing.

[0003] Some liter...

Claims

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