Synthetic aperture radar self-focusing method

A synthetic aperture radar and self-focusing technology, applied in the field of radar, can solve problems such as large amount of computation and low-order phase error in the high-dimensional space search process
CN104251990AActive Publication Date: 2014-12-31UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2014-12-31

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Abstract

The invention discloses a synthetic aperture radar self-focusing method. The synthetic aperture radar self-focusing method specifically comprises the following steps: range pulse compression, range migration correction, azimuth de-ramping, coordinate descent multidimensional phase error estimation, single azimuth unit phase error estimation and multidimensional phase error estimation value output. The synthetic aperture radar self-focusing method disclosed by the invention has the advantages that since a coordinate descent method is used for conducting multidimensional joint estimation of phase errors of each azimuth at each moment and a multidimensional projection method is used for transforming the problem of solving maximum contrast by one-dimension search into the problem of solving a quartic polynomial, the calculation amount is greatly reduced; the estimation of azimuth phase errors by adopting the method disclosed by the invention has the feature of no order limit.
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Description

technical field

[0001] The invention belongs to the field of radar technology, in particular to a synthetic aperture radar self-focusing method. Background technique

[0002] Synthetic Aperture Radar (SAR) is an all-time, all-weather high-resolution microwave remote sensing imaging radar. SAR has played an increasingly important role in the fields of military reconnaissance, topographic mapping, ocean and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of crustal changes. SAR imaging under ideal conditions assumes that the platform moves in a straight line at a constant speed. However, in practice, due to the influence of wind and turbulence, the platform often deviates from the actual trajectory, thereby introducing phase errors and degrading the imaging quality. Therefore, motion compensation is the key technology of SAR high-resolution imaging. At present, SAR motion compensation is mainly divided into two types, one ...

Claims

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