Geo-synchronous orbit synthetic aperture radar (GEO SAR) frequency modulation changeable standard imaging method under curve track model

A technology of curve trajectory and imaging method, applied in the field of communication, can solve the problems of long synthetic aperture time, large amount of calculation and high height, and achieve the effect of wide imaging surveying and mapping bandwidth, improving imaging accuracy and complete motion information.
CN102230964BInactive Publication Date: 2013-03-20XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2013-03-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a geo-synchronous orbit synthetic aperture radar (GEO SAR) frequency modulation changeable standard (CS) imaging method under a curve track model. The method comprises the following steps of: establishing an oblique-distance and high-order expression under the GEO SAR curve track model; deducing a two-dimensional spectrum expression of an echo signal; performing triple Taylor expansion of a distance frequency on the two-dimensional spectrum expression; compensating a triple phase item of the distance frequency in a two-dimensional frequency domain; calculating a distance migration curve in a distance-Doppler domain and multiplying the distance migration curve by a constructed CS phase function; deducing a distance compensation function to finish distance focusing and distance migration correction; and performing direction compression and direction residual phase correction to finish direction focusing. By the method, the spatial-variant properties of the distance migration can be compensated, a wider imaging plotting bandwidth can be obtained and full-aperture high-resolution imaging can be realized. All types of operation in the method are finished throughfast Fourier transform and phase dot product; furthermore, the efficiency is higher and the method is suitable for engineering implementation.
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Description

technical field

[0001] The invention belongs to the technical field of communication, and further relates to a frequency modulation scale (CS) imaging method for wide-area observation of ground targets by Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) in the field of spaceborne radar technology. Background technique

[0002] Geostationary orbit satellites have a high orbital altitude, GEO SAR has strong anti-strike and destruction capabilities, and has strong battlefield survivability. In addition, GEO SAR can cover a large area with a small beam angle and obtain a large-scale and continuous Earth observation capability. It has potential advantages in earthquake and volcano forecasting, marine application research, etc. It has the potential for continuous tracking and high-resolution imaging of moving targets, enabling large-scale strategic surveillance, early warning and battlefield reconnaissance.

[0003] Raney R K. "Precision SAR processing using chirp scaling"...

Claims

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