Bistatic arbitrary configuration SAR imaging method based on equivalent slant range

A technology with arbitrary configuration and imaging method, applied in the field of communication, can solve the problems of large approximation error, unable to achieve phase correction, unable to effectively image the target, etc., to achieve the effect of improving focusing performance, improving imaging accuracy, and overcoming wavefront bending

Inactive Publication Date: 2018-09-04
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that, since the SAR imaging method equates the bistatic double-root slant range history to the single-root slant range history similar to the single-base slant range history, for high-precision SAR imaging of any configuration, there is a large problem. Approximate error, can not achieve accurate phase correction, affect the quality of target imaging
The disadvantage of this method is that in practical applications, the bistatic SAR does not satisfy the fixed station bistatic imaging geometric configuration of the invention, and cannot effectively image the target

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  • Bistatic arbitrary configuration SAR imaging method based on equivalent slant range
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  • Bistatic arbitrary configuration SAR imaging method based on equivalent slant range

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[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0042] Step 1: Establish an equivalent slope distance model.

[0043] figure 2 The model diagram of the SAR equivalent slant distance from the bistatic SAR transceiver platform to the target point with any configuration is given, figure 2 The X-axis in the figure represents the distance coordinate in meters, the Y-axis represents the azimuth coordinate in meters, and the Z-axis represents the height of the transceiver platform in meters. figure 2 P(ρ,θ p,0) means any target point in the imaging area, R T Indicates the instantaneous slope distance of the transmitter on the parent bomb relative to any target point in the scene, R R Indicates the instantaneous slope distance of the receiver on the bullet relative to any target point in the scene, where...

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Abstract

The invention discloses a bistatic arbitrary configuration SAR (Synthetic Aperture Radar) imaging method based on equivalent slant range. The bistatic arbitrary configuration SAR imaging method basedon equivalent slant range includes the steps: 1) constructing a bistatic equivalent slant range model; 2) performing range compression and non space variant error disturbance compensation; 3) performing azimuth de-sloping processing; 4) performing imaging on the ground range with distortion; 5) performing combined compensation of space variant phase error and image distortion on the imaging result; and 6) performing distortion correction on the ground range imaging with distortion. The bistatic arbitrary configuration SAR imaging method based on equivalent slant range can realize accurate phase and motion compensation for bistatic SAR imaging and obtain a bistatic SAR imaging result with higher focusing quality when three axles of a transmitting-receiving platform have velocity and acceleration.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a bistatic arbitrary configuration synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging method based on an equivalent slant distance in the technical field of radar signal processing. The invention can be used for the bistatic SAR imaging of the transceiving platform separated on the arbitrary configuration curve track, obtains the undistorted bistatic SAR ground distance map, and is applied to the subsequent radar image matching and positioning. Background technique [0002] As a new imaging detection system, bistatic SAR imaging can effectively improve the radar's high-resolution continuous detection capability for complex background targets in front by continuously staying in a specific area with the transmitter and receiver beams. Silent strike and other aspects have important military application value. Bistatic SAR has a large three-axis velocity an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9011G01S13/9058
Inventor 李亚超邓欢梅海文全英汇余昆宋炫
Owner XIDIAN UNIV
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