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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

Active Publication Date: 2019-09-06
HUAQIAO UNIVERSITY
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Problems solved by technology

P.Wang only considers the acceleration along the forward viewing direction, ignoring the acceleration in other directions, which affects the accuracy of the distance model with the three-dimensional acceleration curve trajectory

Method used

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

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Embodiment Construction

[0063] The technical solutions in the embodiments of the present invention will be described and discussed in detail below in conjunction with the drawings of the present invention. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0064] see figure 1 As shown, a kind of curve trajectory SAR wavenumber domain imaging method based on Legendre orthogonal decomposition of the present invention comprises the following steps:

[0065] S101, using the three-dimensional velocity and the three-dimensional acceleration to construct a slope distance history expression in a curved motion trajectory mode.

[0066] Specifically, under the curve trajectory motion model, the expression of the instantaneous slope distance history is:

[0067]

[0068] in, h s is the flying height of the SAR carrier, (X s ,Y s ) is the target position of the ground point, v x , v y , v z are th...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/89G01S7/41
CPCG01S13/90G01S13/9011G01S13/9017G01S13/89G01S7/41G01S13/9089G01S13/9004
Inventor 谭鸽伟孟亭亭潘光武
Owner HUAQIAO UNIVERSITY
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