Direct correlation-type complete polarization microwave radiometer receiver scaling method

Abstract

The invention provides a direct correlation-type complete polarization microwave radiometer receiver scaling method. According to a step scaling method, scaling a receiver is completed. The method comprises the following steps: employing signals generated by correlated noise sources of different output temperatures (high temperature source, low temperature source) to fill into a V (vertical polarization) receiver and a H (horizontal polarization) receiver in order through a noise power division network, through four-point scaling, obtaining receiver voltage bias; by utilizing input high temperature source and low temperature source results, obtaining a value of a receiver strip elimination function at a zero point, obtaining reception noise temperatures of the V receiver and the H receiver, and completing normalization processing; through non-relevant noise filling, completing correction of a reception channel residual error, obtaining a multiple association function after final correction, thus obtaining a complete brightness temperature. The method has the characteristics of high scaling precision, simple realization and high reliability, is suitable to spaceborne application, and has wide market application prospect.

Description

technical field [0001] The invention relates to a calibration method for a direct-correlation full-polarization microwave radiometer receiver, which belongs to the field of microwave remote sensing. Background technique [0002] The microwave radiometer is a passive microwave remote sensing instrument that measures the energy of the target's own microwave radiometer. Compared with the traditional microwave radiometer, the direct-correlation full-polarization microwave radiometer can measure the third and fourth parameters of Stokes by performing complex correlation processing on the V and H channels, and then can invert to obtain the wind field results. [0003] The microwave radiometer is an absolute measuring instrument, which must be calibrated to ensure the inversion accuracy of its measured remote sensing parameters. It is necessary to analyze the influence of various factors on the calibration accuracy and take measures to overcome its influence and improve Calibratio...

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Problems solved by technology

[0005] The disadvantages of the above methods are: (1) The fully polarized calibration source requires high processing precision, complex production, difficult to realize, and complicated spaceborne installation. The application of fully polarized calibration sources has a great impact

(2) For the calibration method of single-stage noise injection reception, the gain of the power divider, the temperature and the gain of the receiver need to be measured during the calibration process, which requires the satellite to have very high-precision temperature The control level, and because the fluctuation of the receiving gain will bring a large error, the calibration accuracy is difficult to guarantee

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