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Subaperture-based method and system for reconstruction and imaging of SAR wavefront on curved track missiles

A sub-aperture and curve technology, applied in the field of curved track missile-borne SAR wavefront reconstruction imaging, can solve the problem of not conforming to the motion of the missile-borne SAR platform, etc., and achieve the effect of good focusing effect.

Active Publication Date: 2022-07-12
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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Problems solved by technology

It can be seen that the current research on the imaging problem of the curved trajectory missile-borne SAR focuses on the analysis of the characteristics of the curved SAR system and imaging difficulties. Sports

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  • Subaperture-based method and system for reconstruction and imaging of SAR wavefront on curved track missiles
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  • Subaperture-based method and system for reconstruction and imaging of SAR wavefront on curved track missiles

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Embodiment Construction

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer and more comprehensible, the present invention will be described in further detail below with reference to the accompanying drawings and technical solutions.

[0032] Aiming at the problem of curved track missile-borne SAR imaging, by analyzing the instantaneous Doppler frequency change characteristics of the SAR echo signal under the curved flight of the missile-borne platform, in the embodiment of the present invention, refer to figure 1 As shown, a sub-aperture-based method for reconstructing and imaging a curved track-borne SAR wavefront is provided, including the following contents:

[0033] S101. Segment the aperture of the missile-borne SAR curve to obtain a number of sub-apertures, use a linear aperture to approach each sub-aperture, and perform sub-aperture coarse resolution imaging;

[0034] S102, respectively perform coarse-resolution coherent imaging for each...

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Abstract

The invention belongs to the technical field of radar imaging, and in particular relates to a sub-aperture-based method and system for reconstructing and imaging the wavefront of a missile-borne SAR on a curved track. The instantaneous Doppler frequency variation characteristics of the SAR echo signal, the missile-borne SAR curve aperture is segmented to obtain several sub-apertures, and the linear aperture is used to approach each sub-aperture and perform sub-aperture coarse resolution imaging; Coarse resolution coherent imaging; rotate and coherently stack each sub-aperture imaging image to obtain a full-aperture focused radar image. The invention can better deal with various curved apertures of the missile-borne SAR platform, and is of great significance to the engineering of the curved track SAR seeker; and further simulation data shows that it can effectively handle the curved motion of the SAR carrier platform, to generate well-focused SAR images.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a sub-aperture-based curved track missile-borne SAR wavefront reconstruction imaging method and system. Background technique [0002] The synthetic aperture radar seeker (Synthetic Aperture Radar Seeker, SARS) can use the obtained high-resolution SAR images to complete the accumulated error correction and terminal guidance seeking of the inertial navigation system of the medium and long-range missiles. It is a research hotspot of radar seekers at home and abroad. . Conventional SAR requires the flight path of the carrier platform to be uniform and straight, which seriously limits the flexibility of the flight path planning of the SAR carrier platform, and the flying objects inevitably have curved flight states such as threat avoidance, terrain avoidance, and terminal maneuvers during the flight. Therefore, it is of great practical significance and application v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/88G01S13/90
CPCG01S13/883G01S13/90G01S13/9089G01S13/9041
Inventor 王建涛吴楠秦鑫黄洁党同心卢方合曹澜
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU