Research On Inter-satellite Soft-killing And Monitoring Technologies

Based on the background of future space war and the development trend of satelliteattack and defense means, this thesis does research on some key technologies in spacecombat and monitoring, including a space-based soft-killing anti-satellite weapon attackscheme designing, satellite attitude pointing tracking and orbit hovering control.The dispenser is a kind of anti-satellite weapon which disturbs the sensitivedevices of target satellite by spraying special materials. The centre point of the ejectedinterfering cloud is used to hit the target on behalf of the whole interfering cloud. Soeven if there is a little deviation, it can be regarded as a successful attack as long as thecloud can wrap the target. Attack steps are put forward according to the relative motionrelationship. By setting reference points on the interfering cloud, detailed simulationsand analyses are carried out to verify the attack effects in various conditions.In laser weapon attacking or monitoring and observing missions, the sight line ofthe tracing satellite is often required to point at the target. For this attitude controlproblem, a proper expected attitude is determined, and a PID controller withfeedforward is designed. Flywheels with thrusters configuration scheme is presentedaccording to the torque requirements. Then a terminal sliding mode control algorithm isdesigned. Taking advantage of its anti-interference property, this algorithm doesn’t needthe expected angular acceleration. To match the sliding mode controller, anotherflywheels with control momentum gyroscopes configuration scheme is presented.For hovering relative to the target in monitoring missions, an open-loop controlmethod is presented. This method is based on the “water drop” relative motiontrajectory. It just needs simple control with only one velocity pulse every cycle, and isable to keep the satellite in a fixed direction relative to the target over a period of time.Then a closed-loop controller used fixed-time stabilization algorithm is designed. It canhold the satellite in a fixed point relative to the target for a long time, when there areinitial errors and disturbances.