A control method of risley prism system applied to airborne infrared auxiliary navigation

Abstract

The invention provides a control method of Risley prism system applied to airborne infrared aided navigation. The method comprises the following steps: using sight lines to point to vector commands as input, using the reverse exact analysis algorithm based on the non-paraxial vector ray tracing algorithm, calculating the rotation angles of the prism which can accurately realize the pointing requirement of the sight lines, and using them as control model outputs. This method can effectively solve the problem in practical use that the rotation angles of the prism are on constant large expansion due to the continuous sight line scanning and the mutually independent calculation processes for the rotation angles of the prism corresponding to the vectors pointed to by scattered sight lines, therefore improving the stability and efficiency of prism rotation. The simulation and the implementation results show that the control method can achieve the aim of the invention, has the advantages of precise control of the pointing of sight lines and good control effect for prism rotation. At the same time, as a software control algorithm, the method is cost-effective and can be promoted for wider applications.

Description

technical field [0001] The invention belongs to the field of servo control of aiming line pointing in airborne infrared auxiliary navigation equipment, and mainly relates to a precise control model of a Risley prism system, specifically a control method for a Risley prism system applied to airborne infrared auxiliary navigation, ensuring that the prism Continuous, smooth, efficient rotation. Background technique [0002] The airborne infrared auxiliary navigation equipment is used for the aircraft to scan and observe the area ahead of the flight route at night or under complex weather conditions, and form a clear geographical image in real time for the pilot to observe, which can improve the pilot's perception of the air-ground situation and improve the night vision of the aircraft combat capability. [0003] At present, many airborne infrared auxiliary navigation devices have changed from the traditional form of hanging photoelectric pods to the form of integration with th...

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Problems solved by technology

[0007] Aiming at the problems in the prior art that the dual prism rotation control model is unclear and the Risley prism beam pointing control algorithm is inaccurate, etc., the invention uses a reverse accurate analytical algorithm based on the non-paraxial vector ray tracing method to propose a method that can accurately realize The Risley prism system rotation control model of the aiming line pointing control; aiming at the problem of continuous large-scale rotation of the prism in practical applications, it provides a method to convert the calculation process of the discrete prism rotation angle of each aiming line pointing vector command from independent to interrelated Control method to ensure continuous, smooth and efficient rotation of the prism

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