A Calculation Method of Sun Azimuth Based on cmos

Abstract

The invention relates to a method for calculating a solar azimuth based on a CMOS (Complementary Metal Oxide Semiconductor). The method comprises the following steps of firstly, obtaining the measurement information of the polarization image of each channel by utilizing a three-channel CMOS polarization sensor, and carrying out image pretreatment on the polarization image; secondly, compensating the measurement information of the polarization image, which is subjected to the image pretreatment, by utilizing a parameter which is well calibrated in a laboratory, so as to obtain a polarization azimuth; finally, selecting the calculation expression of the polarization azimuth by sufficiently utilizing the advantage that the sampling points of the polarization sensor based on the CMOS are many and by utilizing the distribution interval, which is obtained based on the information of an original polarization image, of the polarization azimuth, so as to obtain the solar azimuth. The method for calculating the solar azimuth based on the CMOS has the advantages of being high in precision and small in calculation amount, and can be used for a method for calculating the solar azimuth of a polarization navigation sensor based on the CMOS.

Description

technical field [0001] The invention relates to a CMOS-based solar azimuth calculation method, which can be used to improve the solar azimuth calculation accuracy of a polarized light navigation system for unmanned aerial vehicles or ground vehicles. Background technique [0002] Atmospheric polarization patterns contain sun orientation information and can be used for navigation purposes. The present invention proposes a CMOS-based solar azimuth calculation method, by measuring the direction and intensity of polarized light in the sky, the azimuth information of the sun in the module coordinate system (m system) is obtained, combined with the astronomical almanac information, the carrier's azimuth can be further obtained heading information. [0003] Traditional polarization navigation methods are limited by the performance of the sensors used, and cannot make full use of atmospheric polarization information. A method for determining the polarization azimuth angle based on...

AI Technical Summary

Problems solved by technology

A method for determining the polarization azimuth angle based on a six-channel photoelectric sensor, patent number: 201410046227, limited by the low spatial resolution of the photoelectric sensor, the accuracy of the obtained polarization azimuth angle needs to be improved

The method of calculating the navigation direction angle by using the distribution law of the polarization pattern in the sky, patent number: 201010541166.6, proposes a navigation orientation method based on the polarization distribution pattern, uses the polarization information of multiple sampling points to obtain the position of the sun meridian, and thus obtains the direction required for navigation Angle information, many sampling points are easily affected by the external environment, and online calculation is difficult

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