GPS/INS-based dynamic pointing method

Abstract

The invention belongs to the technical field of laser communication pre-pointing capturing and discloses a GPS / INS-based dynamic pointing method. In a GPS / INS combined system, GPS data serve as outer input, INS system errors accumulated along with time are adjusted, and an INS is constantly amended when a carrier moves. The GPS / INS-based dynamic pointing method can solve the problem that GPS signals are lost under the dynamic condition through the INS computed data, and the signal capturing and tracking capacity of a GPS receiver is enhanced. The GPS / INS combined system plays a role in complement, the anti-interference capacity is higher and the precision is higher. The GPS / INS combined system is applied in the pre-pointing technology, the pointing angle value pointing to a target is worked out through the position information, obtained by a GPS, of a ground fixed end target, the movement platform three-axis attitude information and position information which are obtained by real-time measurement of the GPS / INS navigation system, corresponding coordinate conversion and real-time computing, and a two-dimension rotary table can rotate according to the pointing angle value to point to the target in real time.

Description

technical field [0001] The invention relates to a dynamic pointing method based on GPS / INS, in particular to a dynamic pointing method for obtaining a pointing angle by solving real-time updated GPS / INS data, and belongs to the technical field of laser communication pre-pointing capture. Background technique [0002] The laser communication system based on the motion platform, due to the long communication distance, narrow beam and external interference (atmospheric influence, platform angular motion and vibration, etc.), the motion platform must adopt acquisition (Acquisition), tracking (Tracking) and aiming (Pointing) technology (ATP) to establish and maintain an optical communication link to the fixed-end target. Among them, the acquisition technology is used as a prerequisite for tracking and targeting, and is used to quickly establish a laser communication link or restore an interrupted communication link. Whether the field of view of the ATP (acquisition, tracking and...

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Problems solved by technology

[0003] As the core of the capture technology, the initial pointing method has attracted the attention and research of many scholars. For example, in the application number 201310499230.2, the invention name is "A method for initial alignment in the air with strapdown inertial navigation of floating aircraft", and the inventors are Li Baoguo and Lu Jiazhen In the inventions of , Hu Wenyuan, and Wu Meng, the inventor obtains the initial alignment by using the global positioning system (GPS) assisted method. Although the initial alignment obtained with the aid of the GPS system has the advantages of high precision, real-time, and continuity, However, when the GPS cannot receive satellite signals, it cannot perform positioning, and the controllability and reliability are poor under high-speed dynamic conditions.

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