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Imaging method of missile-borne arc diving large squint TOPS SAR

An imaging method and technology of large squint, which can be used in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc., and can solve the problems of target Doppler center nonlinearity, azimuth spectrum aliasing, etc.

Pending Publication Date: 2020-11-03
XIDIAN UNIV
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Problems solved by technology

[0005] However, the current algorithm for oblique stacking of highly squint TOPS SAR on maneuvering platforms can cause azimuth spectrum aliasing and target Doppler centroid nonlinearities

Method used

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  • Imaging method of missile-borne arc diving large squint TOPS SAR
  • Imaging method of missile-borne arc diving large squint TOPS SAR
  • Imaging method of missile-borne arc diving large squint TOPS SAR

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Embodiment 1

[0077] See figure 1 , figure 1 It is an imaging method of missile-borne arc dive high squint TOPS SAR provided by the embodiment of the present invention. The present embodiment provides a kind of imaging method of missile-borne arc dive high squint TOPS SAR, this imaging method comprises step 1-step 10, wherein:

[0078] Step 1. Establishing a slant distance model of concentric circles with high squint. The instantaneous slant distance of the concentric circle slant distance model with high squint is approximated as a fourth-order Taylor series.

[0079] Specifically, see figure 2 , the high squint concentric circle slant range model of the present embodiment is a TOPS SAR imaging geometric model of joint time-frequency domain de-slanting of missile-borne arc dive, the high squint concentric circle slant range model includes: T a Inside, the radar platform takes the velocity vector and a constant acceleration vector Move along the curve ABCD (the curve ABCD is a segm...

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Abstract

The invention discloses an imaging method of a missile-borne arc diving large squint TOPS SAR. The imaging method mainly solves the problems of azimuth spectrum aliasing and target Doppler center nonlinearity caused by inclined superposition on a maneuvering platform through SAR imaging under large strabismus of a maneuvering track in the prior art. Aiming at azimuth aliasing, the invention provides the imaging method based on joint time domain dechirping. The method comprises the steps: acquiring an expanded two-dimensional spectrum by improved time domain linear dechirping; in a two-dimensional frequency domain, after range migration correction is carried out, acquiring a signal aligned with a target time-frequency line through Doppler domain nonlinear dechirping; eliminating the space-variant property of space-variant Doppler parameters through frequency domain nonlinear scaling; completing the azimuth focusing through the SPECAN technology; and finally, verifying the effectivenessof the proposed algorithm through simulation and actual measurement of TOPS SAR data. Through the necessary adjustment, the algorithm can be applied to sliding bunching and bunching SAR installed on amaneuvering platform.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an imaging method of a bomb-borne arc dive high squint TOPS SAR. Background technique [0002] SAR (Synthetic Aperture Radar) is an advanced radar system that can work all-weather and all-weather, and has been widely used in global terrain observation, ocean remote sensing and many other aspects. With the development of synthetic aperture radar, many new SAR platforms have emerged, such as missiles and fighter jets. In order to meet the application requirements of different platforms, in addition to multi-mode modes such as strip mode, beamforming, and sliding beamforming, TOPS (terrain observation by progressive scans) SAR has also been widely used. [0003] The azimuth width of the stripe mode is limited by the beam width and the synthetic aperture time, while the large squint TOPS SAR on the maneuvering platform has the flexibility of the surveilla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9017G01S13/9094G01S13/9041G01S13/9052G01S13/9056
Inventor 孙光才李宁张尊杰邢孟道别博文
Owner XIDIAN UNIV
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