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Doppler parameter estimation method based on image quality evaluation

A technology for image quality assessment and Doppler parameters, which is applied in the field of evaluating image quality and estimating Doppler parameters, and in the field of synthetic aperture radar imaging. Universal effect

Active Publication Date: 2021-10-29
北京理工雷科电子信息技术有限公司
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Problems solved by technology

However, each algorithm has limitations. It can only be applied to scenes and application backgrounds with different characteristics. It cannot be imaged in various scenes and application backgrounds. It cannot be imaged normally at the same time in ideal flight and unstable flight scenes.

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  • Doppler parameter estimation method based on image quality evaluation
  • Doppler parameter estimation method based on image quality evaluation

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Embodiment Construction

[0026] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0027] Concrete processing flow of the present invention is as figure 1 As shown, it includes the following sub-steps and the specific instructions are as follows:

[0028] Step 1, read in the echo data and aircraft parameters, and set various system parameters, the specific steps are divided into:

[0029] S11, read in the echo data, set the number of points in the azimuth direction as Na, and the number of points in the range direction as Nr, then the echo data is a matrix of Na*Nr size;

[0030] S12, read in the aircraft parameters: aircraft speed, aircraft altitude, antenna azimuth, antenna pitch angle, aircraft heading angle, roll angle, pitch angle;

[0031] S13, setting various system parameters: bandwidth, sampling rate, pulse width, repetition frequency, and imaging center action distance.

[0032] Step 2, distance processing, the spe...

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Abstract

The invention provides a Doppler parameter estimation method based on image quality evaluation, which can be suitable for realizing normal imaging in ideal flight and unstable flight scenes under various scenes and application backgrounds. According to the method, the image definition is evaluated through entropy values, Doppler parameters are estimated through a two-dimensional search method, normal imaging can be achieved in ideal flight and unstable flight scenes, the problem that imaging can be achieved in various scenes and application backgrounds is solved, and the method has the advantages of being high in efficiency and high in scene universality.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and relates to a synthetic aperture radar imaging method in the field of airborne radar, in particular to a method for estimating Doppler parameters by evaluating image quality when the airborne radar images the ground. Background technique [0002] Airborne Synthetic Aperture Radar (SAR) system is a coherent imaging system capable of producing high-resolution images. Its high-resolution capability requires a stable geometric relationship between the aircraft and the imaging area. Affected by atmospheric turbulence, the flight attitude of the carrier aircraft often deviates from the ideal state, resulting in large estimation errors of Doppler parameters (including Doppler center frequency and Doppler modulation frequency), which seriously affect the imaging effect. The Doppler center frequency corresponds to the energy center of the radar beam, and a large estimation error will cause the im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9019
Inventor 王长杰暴泰吏刘腾飞
Owner 北京理工雷科电子信息技术有限公司
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