Water vapor correction precision analysis method under different sea conditions based on microwave radiation

Abstract

The invention discloses a water vapor correction precision analysis method under different sea conditions based on microwave radiation. Firstly, factors influencing determination of water vapor correction precision are deduced by a water vapor correction model, wherein the factors comprise sea conditions, brightness temperature measurement values of the frequency, brightness temperature values of other frequencies and brightness temperature measurement precision. Numerical simulation is carried out on brightness temperature measurement values through a brightness temperature determination theoretical model, and an error propagation coefficient is calculated by traversing a brightness temperature measurement value range; and finally calculating the water vapor correction precision under different sea conditions. Compared with a water vapor correction precision analysis method obtained by using test data in the prior art, the method considers more comprehensive and finer problems, the water vapor correction precision under different sea conditions is obtained, and a solution is provided for realizing fine determination of satellite altimetry precision under different sea conditions.

Description

technical field [0001] The invention relates to the field of ocean altimetry satellite task analysis and data product processing, in particular to a method for analyzing the accuracy of water vapor correction under different sea conditions based on microwave radiation. Background technique [0002] Satellite altimetry technology uses a spaceborne radar altimeter to measure the distance from the satellite to the ocean surface, and subtracts it from the altitude of the satellite orbit to obtain sea surface height data. It has become an effective measurement method for obtaining sea surface height information on a large scale. The electromagnetic waves emitted by the spaceborne radar altimeter are affected by the atmosphere and cause ranging deviations. The influence of water vapor content has great randomness and uncertainty. Usually, the measurement data of the microwave radiometer is used to obtain the effect of water vapor content on altimeter measurement. distance correcti...

AI Technical Summary

Problems solved by technology

[0004] (1) The research in the existing literature mainly focuses on the data inversion method of the microwave radiometer, and seldom studies the accuracy matching between the measurement data and the correction value, making it difficult to determine the measurement accuracy of the spaceborne microwave radiometer in engineering practice index

[0005] (2) The existing literature uses experimental data to give the error propagation relationship between the brightness temperature data of the microwave radiometer and the water vapor correction value, and does not consider the water vapor correction accuracy under different sea conditions in detail

Images