Method for correcting atmospheric refraction for radar measurement

Abstract

The invention relates to a method for correcting atmospheric refraction when a radar measures the flight path of a space target. The method is mainly applied to radar precision identification, uses astandard track for identifying a target as a correction reference, and changes a ground vertical reference from an earth's core-to-radar position vector in a traditional method to an earth ellipsoid curvature center-to-radar position vector. Thus, the geocentric distance is replaced by curvature center distance and the earth's core intersection angle is replaced by the curvature center intersection angle so as to improve the refractive correction in the space target measurement. The method considers the non-spherical characteristic of the earth, makes the calculation of the refraction error closer to the physical reality, can be directly applied to the precision identification of the space target measurement radar, improves the error separation level of the precision radar, is used in thefields of space debris environment monitoring, in-orbit service and space situational awareness energy, and improves the space target measuring and tracking ability.

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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