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Method for compensating Doppler center error of along-track interferometric SAR (Synthetic Aperture Radar) in flow velocity measurement

A technology of Doppler center and flow velocity measurement, which is applied in the field of microwave remote sensing to achieve the effect of improving measurement accuracy

Inactive Publication Date: 2018-06-12
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

This technology does not involve the along-track interferometric SAR technology, nor does it involve the use of echo Doppler spectrum to calculate the high-order derivative of the interferometric phase

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  • Method for compensating Doppler center error of along-track interferometric SAR (Synthetic Aperture Radar) in flow velocity measurement
  • Method for compensating Doppler center error of along-track interferometric SAR (Synthetic Aperture Radar) in flow velocity measurement
  • Method for compensating Doppler center error of along-track interferometric SAR (Synthetic Aperture Radar) in flow velocity measurement

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[0048] The following combination Figure 1 ~ Figure 3 , the technical content, structural features, achieved goals and effects of the present invention will be described in detail through preferred embodiments.

[0049] Such as figure 1 As shown, it is the Doppler center error compensation method of along-track interferometric SAR in flow velocity measurement provided by the present invention. Through the calculation of each order derivative term value of along-track interferometric phase, the Bragg resonance wave phase velocity, wave orbit velocity and Compensate for the Doppler center offset caused by its acceleration, jerk, etc.; including the following steps:

[0050] S1. Calculating the sea surface echo power spectrum of the along-track interferometric SAR;

[0051] S2. According to the Fourier transform pair relationship between the sea surface echo autocorrelation function and the sea surface echo power spectrum, calculate the derivative value of each order of the sea...

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Abstract

The invention relates to a method for compensating a Doppler center error of along-track interferometric SAR (Synthetic Aperture Radar) in flow velocity measurement, which comprises the steps of S1, calculating a sea echo power spectrum of the along-track interferometric SAR; S2, calculating all-order derivative term values of a sea echo autocorrelation function according to a Fourier transform pair relation between the sea echo autocorrelation function and the sea echo power spectrum; S3, calculating all-order derivative term values of the along-track interferometric phase through the all-order derivative term values of the sea echo autocorrelation function according to a relation that the along-track interferometric phase is approximately equal to the phase of the sea echo autocorrelation function; and S4, compensating the Doppler center error of the along-track interferometric SAR according to the all-order derivative term values of the along-track interferometric phase. According to the invention, the Doppler center error generated by a high-order velocity change caused by the Bragg resonance wave phase velocity, the wave track velocity and various modulations can be compensated under a condition that the imaging time delay is great, and the measurement accuracy of the surface flow field velocity is improved.

Description

technical field [0001] The invention relates to a method for measuring flow field velocity of along-track interference SAR (Synthetic Aperture Radar), in particular to a Doppler center error compensation method of along-track interference SAR in flow velocity measurement, and belongs to the technical field of microwave remote sensing. Background technique [0002] One of the main applications of Synthetic Aperture Radar (SAR) in the ocean is to invert the velocity of the flow field. Studies have shown that the Doppler (Doppler) velocity field directly obtained by using the along-track interferometric SAR is actually the surface flow. Field velocity, Bragg (Bragg) resonance wave phase velocity, wave orbital velocity, etc., so in order to obtain the surface flow field velocity, it is necessary to filter out the Bragg resonance wave phase velocity and wave orbital velocity from the Doppler velocity. portion. [0003] In the actual ocean, the ocean current is the overall drift ...

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Application Information

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IPC IPC(8): G01S13/90G01P5/00
CPCG01P5/00G01S13/9023
Inventor 于祥祯丛颖娜王佳朱炳祺马婷婷马宪超邹小东
Owner SHANGHAI RADIO EQUIP RES INST
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