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Method for determining influence on scaling by high-resolution SAR reference target RCS and compensation method

A reference target, high-resolution technology, applied in the field of signal processing, can solve the problems of insufficient quality evaluation indicators, comprehensive quantitative analysis and evaluation, etc., to achieve the effect of saving computing power, reducing computing power, and satisfying detection accuracy

Active Publication Date: 2015-06-24
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] (3) No comprehensive quantitative analysis and evaluation: When performing high-resolution SAR system simulation, the influence of RCS frequency band and azimuth angle correlation is not considered at the same time, and the quality evaluation indicators for the final results are not comprehensive enough

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  • Method for determining influence on scaling by high-resolution SAR reference target RCS and compensation method
  • Method for determining influence on scaling by high-resolution SAR reference target RCS and compensation method

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Embodiment Construction

[0024] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0025] Establishing the quantitative relationship between the target scattering characteristics and the echo signal through the radar equation is the premise of the theoretical analysis of radiometric calibration. The average received signal power of the high-resolution SAR image can be expressed as:

[0026] P r = P t G 2 ( f , α ) G s ( f ) λ 3 ( f ) ...

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Abstract

The invention discloses a method for determining the influence on scaling by a high-resolution SAR reference target RCS and a compensation method. The method for determining the influence on scaling by the high-resolution SAR reference target RCS comprises the steps that based on an FEKO three-dimensional electromagnetic simulation result, data of the reference target RCS changing along with frequency bands or azimuth angles are acquired based on a multilevel fast multipole method; afterwards, the reference target RCS is introduced into an SAR echo signal, so the influence on an imaging result by the reference target RCS changing along with the frequency bands or the azimuth angles can be analyzed and estimated comprehensively and quantitatively; accordingly, the method is an analyzing method closer to actual conditions. The compensation method comprises the steps that firstly, existing high-resolution SAR reference target RCS data having different center frequencies and / or frequency band ranges are simulated; secondly, based on the result of the influence on scaling, the maximum value of integral energy difference values in bandwidth which actually uses high-resolution SAR is judged, and whether at least one of the maximum values of integral energy difference values in azimuth beamwidth is greater than or equal to 0.2 dB is judged, so whether echo compensation is performed or not is determined. Accordingly, the computation burden can be reduced while SAR detection accuracy is met.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a method for determining the influence of a high-resolution SAR reference target RCS on calibration. Background technique [0002] For narrowband and narrow azimuth beam SAR (Synthetic Aperture Radar) systems, it is considered that the RCS (Radar Cross-Section) of the calibration reference point target is approximately constant within the operating bandwidth and azimuth beam. However, with the improvement of image resolution requirements in remote sensing applications, many high-resolution SAR (SAR with a frequency band greater than 2 GHz and / or an azimuth beamwidth greater than 20° is generally considered to be a high-resolution SAR) system has been produced. The bandwidth can exceed 10% or even reach 100%, and the azimuth incident angle range can be increased from a few degrees to tens of degrees or even 360° (circular SAR). Under the characteristics of l...

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Application Information

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IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S7/4004G01S7/4052G01S13/90G01S13/9011H01Q15/18
Inventor 雷大力洪峻王宇费春娇
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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