Signal processing method of satellite-bone sliding spotlight synthetic aperture radar

A technology of synthetic aperture radar and sliding beamforming, which is applied in the directions of radio wave reflection/reradiation, utilization of reradiation, measurement devices, etc., and can solve the problems of azimuth ambiguity reduction, signal-to-noise ratio loss, image offset, etc.
CN102680974BActive Publication Date: 2013-08-28XIAN INSTITUE OF SPACE RADIO TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAN INSTITUE OF SPACE RADIO TECH
Publication Date
2013-08-28

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Abstract

The invention discloses a signal processing method of a satellite-bone sliding spotlight synthetic aperture radar. The method includes: performing molecule aperture processing on original echo data of the sliding spotlight synthetic aperture radar (SAR); performing range compression and range migration correction through a chirp scaling (CS) algorithm; introducing squint angle compensation in theCS algorithm; compensating scene space-variant performance; adjusting range migration amount of all sub-apertures to be identical with Doppler parameters of full apertures in CS scalar variable factors as the standard; performing azimuth compression and quadratic term compensation in the frequency domain, and performing frequency modulation processing in the time domain; splicing data of all the sub-apertures and restoring resolution ratio of the full apertures; and enabling signals to have phase preservation performance through spectrum analyzer (SPECAN) processing. By adopting the signal processing method, imaging quality can be improved under the condition of large scene squinting.
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Description

technical field

[0001] The invention relates to a method for processing synthetic aperture radar signals, in particular to a signal processing method under the condition of squinting in a large scene in a sliding spotlight mode. Background technique

[0002] Synthetic Aperture Radar (SAR) is a typical radar system for ground reconnaissance and imaging. It is mainly used for military reconnaissance and disaster monitoring. It is currently one of the important microwave remote sensing instruments that can work all day and all day. At present, the common working modes of SAR mainly include strip mode, scanning mode, spotlight mode, sliding spotlight mode, TOPS mode and so on. Among these SAR imaging modes, the strip mode can achieve a wide swath in azimuth, but it is difficult to achieve high resolution; in the scan mode, although a swath with a wide range and azimuth can be obtained at the same time, the resolution is sacrificed. At the cost, its resolution is lower than that...

Claims

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