Satellite Intelligent Autonomous Control Systems

The satellite control system is a very complex system, and it includes many contents. This thesis, taking geosynchronous satellite as an example, studies systematically and thoroughly the multi-sensor information fusion technology, studies fault diagnosis and system rebuild technology in satellite attitude control system, and studies autonomous navigation, orbital keeping technology.The main work done in the thesis is as follows:1. The research on multi-sensor information fusion technology: The federated filter is constructed. State and observation equations of each subsystem are established. Filter algorithms of each subsystem and federated filter algorithms, centralized filter algorithms are also analyzed. When the sampling periods of the main filter and the subfilters are supposed to be different, the attitude determination effect is investigated and the computer simulation is done.2. The research on fault diagnosis and system rebuild technology in satellite attitude control system: The intelligent and independent algorithms about fault diagnosis and system rebuild technology in satellite attitude control system are put forward. Because that the inertial measurement system is very important in the federated filter, the component fault diagnosis and isolation algorithms in the inertial measurement system are also discussed.3. The research on autonomous navigation and orbital keeping technology of geosynchronous satellites: Selecting position vector in the inertia space and longitude, latitude, radial errors in the Hill equation as state variables, the precision of orbit determination caused by track dynamic model error, sampling period, and sensor measurement and install error is analyzed. According as the need of satellites orbital keeping request, orbital keeping project is brought forward. It can be guaranteed that the satellites' longitude and latitude excursion will always keep less than the given value.The main innovations done in the thesis are as follows:1. The fault detection theories of local filter level and component level in the strapdown inertial navigation system (SINS) are applied in the satellite control system. The independence and the fault tolerance ability are improved.2. Using the startlight angle as measurements, extended kalman filter is used for orbit determination.