Method for correcting atmospheric refraction for radar measurement

An atmospheric refraction and radar technology, applied in the aerospace field, can solve the problems of low utilization rate and inaccuracy of information, and achieve the effects of accurate target reference position, improved refraction accuracy, and improved calculation efficiency.

Active Publication Date: 2019-06-25
NO 63921 UNIT OF PLA
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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 correcti

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  • Method for correcting atmospheric refraction for radar measurement
  • Method for correcting atmospheric refraction for radar measurement
  • Method for correcting atmospheric refraction for radar measurement

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Embodiment Construction

[0068] The present invention proposes a radar measurement atmospheric refraction correction method based on the curvature center of the earth ellipsoid. This method improves the angle calculation formula and iteration strategy in the refraction correction method through the introduction of high-precision reference orbit and earth model information, thereby improving the refraction Calculation efficiency and accuracy of the correction amount. figure 1 The processing flow of the refraction correction method is given, and the method is implemented in two steps. The specific implementation of the invention will be described in detail below.

[0069] (1) Calculate the apparent elevation angle and distance based on the reference orbit of the space target, and establish the basic formula of refraction iteration

[0070] The steps refer to using the space target track data obtained by a third party as the comparison reference data according to the task characteristics of the radar acc...

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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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Application Information

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IPC IPC(8): G01S13/66G01S7/02
Inventor 张延鑫赵华刘也金雪刘元
Owner NO 63921 UNIT OF PLA
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