A Method for Extracting and Compensating Motion Errors of Multi-dimensional Synthetic Aperture Radar

A synthetic aperture radar, motion error technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve problems such as the inability to meet uniform linear motion, and achieve the effect of reducing impact and improving versatility

Active Publication Date: 2014-10-22
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

Yet, actual flight condition can not satisfy the ideal imaging condition of uniform linear motion, for atmospheric aircraft,

Method used

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  • A Method for Extracting and Compensating Motion Errors of Multi-dimensional Synthetic Aperture Radar
  • A Method for Extracting and Compensating Motion Errors of Multi-dimensional Synthetic Aperture Radar
  • A Method for Extracting and Compensating Motion Errors of Multi-dimensional Synthetic Aperture Radar

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Embodiment Construction

[0057] Step S06: Carry out precision analysis to the combined motion parameters to determine whether the precision requirement is met? in the case of,

[0060] Step S09: judging whether the focus quality requirement is met? If yes, complete op compensation, if no, execute

[0066] Step two: windowing along the azimuth. Such as a Hamming window of Na length:

[0069]

[0070] The fourth step: reduce the impact of the larger and smaller values ​​of S(n) on the estimation results. First, find the mean of S(n), and take the root

[0072] fdc=Nmax / Na*PRF (3)

[0078]

[0079] Wherein, s (n) is the signal after distance compression, and d (n) is the first-order difference of s (n).

[0083] In the image domain, the focus error is measured, and compared with the ideal motion parameters, the motion error in the image domain is calculated. in the image

[0084] Two-view processing is adopted for azimuth compression, and the center frequencies of the two sub-view images are respectively...

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Abstract

The invention relates to a multi-dimensional synthetic aperture radar motion error extraction and compensation method, which belongs to the technical field of radar. The method includes: extracting motion parameters of a synthetic aperture radar (SAR) from a motion sensor, and projecting the motion parameters to its dimension; analyzing the error accuracy of the motion parameters to determine whether the accuracy requirements are met? If yes, perform motion compensation directly, if not, combine the radar parameters estimated from the SAR raw data with the radar motion parameters extracted from the motion sensor, and then analyze the error accuracy. If the error accuracy meets the requirements, the focus quality analysis is performed, and if the focus quality is met, the compensation is completed. If not, the phase error of the radar echo signal is estimated from the SAR raw data, and the phase error compensation is performed, and then the image is focused quality analysis. The invention can distribute the compensation accuracy to reduce the influence of the sensor accuracy on the motion compensation.

Description

A multi-dimensional synthetic aperture radar motion error extraction and compensation method Technical field The invention belongs to technical field of synthetic aperture radar, be specifically related to a kind of multidimensional synthetic aperture radar motion error Extraction and compensation methods. Background technique Synthetic aperture radar (SAR) is a kind of high resolution microwave imaging radar, can carry out high resolution to ground target High-rate detection, and has the advantages of all-weather and all-day. Since the aperture synthesis method appeared in the 1950s, SAR systems have been loaded in large quantities on aircraft, satellites and other flight platforms for the detection of ground targets. It has been widely used in inspection, crop monitoring, marine monitoring, military reconnaissance and other fields. [0003] In order to ensure the normal operation of the synthetic aperture radar, the prerequisite is that the radar will be installed o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 王岩飞樊邦奎韩松徐向辉刘畅
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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