A Method of Inversion and Correction of Atmospheric Refraction Error of Differential Sky Polarization Compass

Abstract

The invention discloses an inversion and correction method of an atmospheric refraction error of a differential sky polarization compass. The method comprises the following steps: a reference stationmeasures polarized light in the sky, inverts an atmospheric refraction error angle under the current sky in combination with known position, time, heading and other information, and uploads the atmospheric refraction error angle to a data center; the sky polarization data center receives and stores the atmospheric refraction error angle data sent from multiple reference stations; a client sky polarization compass sends a data request to the sky polarization data center; the sky polarization data center selects the atmospheric refraction error angle data of the multiple reference stations adjacent to a client and allocates the atmospheric refraction error angle data to the client sky polarization compass after weighing the same; and the client sky polarization compass performs navigation correction by using the received atmospheric refraction error angle data to achieve high-precision heading calculation. Compared with the prior art, the inversion and correction method disclosed by theinvention has the following advantages: the influence of the randomly changing atmospheric refraction errors on the sky polarization compass can be reduced, and the heading calculation accuracy of thesky polarization compass is improved.

Description

technical field [0001] The invention relates to an inversion and correction method for the atmospheric refraction error of a differential sky polarization compass, which can be used for high-precision navigation of the sky polarization compass. Background technique [0002] The polarized light in the sky has a relatively stable distribution pattern, and the orientation information contained in the polarized light can be determined by combining the real-time time and geographic location information of the carrier. The mobile carrier uses the sky polarization compass to detect and calculate the sky polarized light, and can obtain the navigation parameters of the body to realize fully autonomous polarized light navigation. Atmospheric refraction is a common optical phenomenon. When sunlight or other electromagnetic waves that originally travel in a straight line pass through the atmosphere, they will be deflected due to environmental factors such as air density. In fact, we se...

AI Technical Summary

Problems solved by technology

It does not consider the influence of atmospheric refraction error on the measured value of polarization angle, and cannot solve the problem of decreased heading accuracy caused by randomly changing atmospheric refraction error

In the process of measurement and navigation calculation, the existing sky polarization compass does not consider the influence of atmospheric refraction on the transmission of polarized light, and thinks that polarized light is transmitted along a straight line

Therefore, there is inevitably an error caused by atmospheric refraction. Although this error is small under an ideal clear sky, it must be corrected if high-precision polarized light navigation is to be realized.

[0005] In general, the current sky polarization compass has the defect of not correcting the atmospheric refraction error, and the existing atmospheric refraction error correction methods in other technical fields do not consider the random variation characteristics of atmospheric refraction, and these correction methods have deficiencies

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