Research On The Method Of Obtaining Solar Position By Using "?" Shape Characteristic Of Atmospheric Polarization Pattern

Bionic polarized light navigation based on natural polarization characteristics is a passive autonomous navigation method,which is difficult to be interfered by human in a wide range and is particularly suitable for autonomous navigation in a weak/no satellite signal environment.Therefore,it is of great significance to research on autonomous navigation in the absence of satellite signals.In order to solve the problem of how to obtain the solar position information in bionic polarized light navigation,two methods by using the "?" shape distribution feature of atmospheric polarization pattern are proposed.The external field experiments were carried out to obtain the solar position.The main work of this paper includes:(1)Aiming at how to use the atmospheric polarization pattern to obtain the solar position,a method of obtaining the solar position by using the atmospheric polarization pattern based on a hybrid genetic algorithm(abbreviated as GA-GD algorithm)combined with a genetic algorithm and a gradient algorithm is proposed,and transforms the solution of the solar position into Global optimization problem,rapidly position by using the genetic algorithm and combined with the gradient algorithm for local optimization,realized the effective acquisition of the solar position;(2)Aiming at the existing methods of obtaining the solar position,the nonlinear functional equations are mostly used to find the optimal solution,but there are some problems.A Linear fitting method to obtain the solar position based on the atmospheric polarization pattern is proposed,through the establishment of the linear fitting model,realized to obtain the solar position.(3)The field experiments were conducted to collect atmospheric polarization data at different times.The GA-GD algorithm results showed that the solar position error was less than 1 degree.The second algorithm results show that the solar azimuth error is less than 0.2 degrees and the solar elevation angle error is less than 0.4 degrees.The linear fitting method has greater advantages in solving accuracy,complexity,and solution time than the GA-GD algorithm.