The Attitude Dynamics Modeling And Control System Research Of The Geostationary Orbit Infrared Early Warning Satellite

Infrared pre-alarm satellite, usually located in geostationary orbit and also used for missile pre-alarming, can be used to monitor situation of missile launching by constantly scanning the earth by on-board infrared camera and calculate ballistic parameters of infrared target according to the information detected, so as to offer necessary information for defending against the infrared target. The high attitude and weak visibility of the satellite and high requirement of target location for missile pre-alarm required high accuracy of satellite attitude control. Taking this kind of satellite as a research object, a profound research, in this thesis, is made on the topic of high-accuracy and attitude stability control of infrared satellite covering characteristic analysis of camera movement, dynamics equator modeling of two-level control, modeling analysis of disturbance moment and compensation design.According to the current demand of early-warning satellite and development of the infrared camera, a comprehensive analysis of on-board scanning infrared satellite and staring infrared satellite is conducted, including the system composition, working principle and mode as well as rules of movement. Based on the Lagrange scheme, dynamics equation and disturbance moment modeling of camera movement are established from the perspective of satellite attitude and camera scanning, providing theoretical basis for simulation modeling and disturbance compensation simulation.In view of the requirement of high-accuracy and high-stability of infrared pre-alarm satellite, satellite attitude and control with camera scanning and moving is researched and analyzed, forming simulation modeling of main dynamics of system. In this case, detailed analysis and deep research, in this thesis, are made on platform-feed-forward scheme and camera-self-compensation scheme. Simulation result verifies that different compensation schemes can effectively erase disturbance influence by the camera movement, providing important groundings for control system plan.