A Correction Method of Atmospheric Refraction in Radar Measurement

Abstract

The present invention relates to a method for correcting atmospheric refraction when the radar measures the flight trajectory of a space target. The method is mainly used in the work of radar accuracy appraisal, etc., using the standard track of the appraisal target as a correction reference, and changing the vertical reference of the ground from the traditional method. The center-to-radar position vector is improved to the earth ellipsoid curvature center-to-radar position vector, so that the distance from the center of curvature is replaced by the distance from the center of the earth, and the angle between the center of curvature is replaced by the angle between the center of the earth, so as to achieve the purpose of improving the refraction correction in space target measurement. The invention considers the non-spherical characteristics of the earth, makes the calculation of refraction error closer to the physical reality, can be directly applied to the accuracy appraisal of space target measurement radar, improves the error separation level of precision radar, etc., and serves for space debris environmental monitoring, on-orbit In the field of service and space situational awareness, improve the ability to measure and track space targets.

Description

technical field [0001] The invention relates to the field of aerospace technology, and relates to an atmospheric refraction correction method when a radar measures the flight trajectory of a space target. Background technique [0002] When the ground-based radar tracks and measures the space target, the electromagnetic wave is affected by atmospheric refraction and bends, and the ranging value, angle measurement (mainly the pitch angle) and velocity measurement value need to be corrected. [0003] In the study of atmospheric refraction correction methods, predecessors have carried out in-depth research, which has solved the general measurement application problems well. At present, the idea of ​​the main refraction correction method is to divide the calculation of the refraction correction amount into two steps based on the assumption of atmospheric stratification. The first step is to calculate the atmospheric refraction index of the radio wave transmission path according t...

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Problems solved by technology

[0006] In order to meet the identification requirements of radar equipment measurement accuracy in the aerospace field, the present invention provides an atmospheric refraction correction method for radar measurement, which overcomes the defects of low information utilization and inaccuracy in traditional methods, and improves the accuracy and Computational efficiency

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