Method and system for evaluating measurement accuracy of interferometric radar altimeter

Abstract

The invention discloses a method and a system for evaluating the measurement accuracy of an interferometric radar altimeter, and relates to the field of marine surveying and mapping. The method includes dividing to obtain a global longitude and latitude grid; calculating the vertical deviation along the rail direction and the vertical deviation along the reverse rail direction of grid points of the global longitude and latitude grid in the width area according to the acquired observation data and the global longitude and latitude grid; calculating the azimuth angle of the grid points along therail direction; calculating vertical deviation values of the grid points; grouping the vertical deviation values of the grid points; judging to obtain first grid points, and calculating the standarddeviation of the vertical deviation value of the first grid points; calculating the mean value of standard deviation, wherein the mean value of the standard deviation is the measurement accuracy of the width area; and comparing the measurement accuracy of all width areas and evaluating the measurement accuracy of the width areas. The method can obtain the measurement accuracy of different swath width measurement areas, and fully utilizes the observation data of multi-period satellites in global sea areas, so that the accuracy evaluation result has high reliability.

Description

technical field [0001] The invention relates to the field of marine surveying and mapping, in particular to a method and system for evaluating the measurement accuracy of an interferometric radar altimeter. Background technique [0002] The development of satellite altimetry technology has gone through decades. In the past 20 years, with the continuous development of satellite navigation and positioning technology, the accuracy of satellite altimetry has also been continuously improved, and it has reached the order of several centimeters. In the past ten years, the emergence and development of synthetic aperture radar altimetry technology has further improved the accuracy and resolution of satellite measurement of sea surface height. [0003] In the interferometric radar altimetry technology, due to the limitation of the measurement system, the measurement accuracy of the sea surface height corresponding to different measurement angles is different. However, the existing tec...

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Problems solved by technology

[0003] In the interferometric radar altimetry technology, due to the limitation of the measurement system, the measurement accuracy of the sea surface height corresponding to different measurement angles is different. However, the existing technology does not evaluate the quality of the measurement accuracy, and cannot judge the quality of the measurement accuracy.

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