Atmospheric refraction error correction method for aviation star sensor

Abstract

The invention belongs to the technical field of spaceflight measurement and control, and particularly relates to an atmospheric refraction error correction method for an aviation star sensor. The method comprises the following steps of: performing series expansion on an atmospheric refraction integral formula according to a secant function to obtain an initial form of series expansion, screening series expansion terms according to a correction precision requirement and obtaining an atmospheric refraction correction model; according to the mass spectrometer and incoherent scattering radar, acquiring atmospheric parameter data of which the altitude is greater than 6000 meters; analyzing monthly average atmospheric parameter data hour by hour according to the NCEP, obtaining atmospheric parameter data with altitude below 6000 meters, and establishing an atmospheric parameter empirical model according to the obtained atmospheric parameter data and atmospheric parameter data; according to the input parameters obtained in real time, conducting combined processing on the atmospheric refraction correction model and the atmospheric parameter empirical model, correcting atmospheric refraction errors, and obtaining corrected atmospheric refraction errors.

Description

technical field [0001] The invention belongs to the technical field of research and application of aerospace measurement and control and atmospheric refraction effect, and in particular relates to a correction method for atmospheric refraction error of an aviation star sensor. Background technique [0002] The aviation star sensor is an important part of the navigation system of civil and military aircraft. By taking star maps in real time, and then performing star map recognition and attitude calculation, the navigation of civil and military aircraft is realized. Therefore, a clear and accurate star map is a research The basis of aviation star sensor navigation systems. When the aeronautical star sensor is working, it will be interfered by the noise of the star sensor itself. When the aeronautical star sensor is imaging, it will also be affected by various factors, such as atmospheric refraction. [0003] Optical equipment relies on the principle of optical imaging to meas...

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Problems solved by technology

[0004] At present, in the field of atmospheric refraction correction, the refraction correction mostly uses the ray tracing method to calculate the atmospheric refraction error. The general method of the ray tracing method is to use the Hopfield model, the exponential model, the double exponential model and the exact segment model to find the atmospheric refractive index profile, and then bring the atmospheric refractivity profile into the atmospheric refraction integral formula for approximate processing. Due to the uncertainty of atmospheric refraction parameters, the correction accuracy of the atmospheric refraction error correction method based on the atmospheric refractivity profile is low, which leads to the sensitivity of aviation stars. The navigation error of the device is large

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