Research On Autonomous SINS/GNSS/CNS Navigation For High Orbit Vehicle Transfering

It is highly important to evade assault by increasing the safety and independence of orbital spacevehicle for orbital space vehicles, with autonomous navigation holding. Further more, precise orbitdetermination is also important because most spacecrafts realize orbit determination depending onmeasurement and control of earth station with prodigious probability of demolishing in wartime.Consequently.more emphasis is put to autonomous navigation of orbital space vehicles. This thesis isto study a scheme which suits to autonomous navigation of spacecrafts.First,the scheme based on GNSS is analyzed.The number of visual satellites by orbital spacevehicles is simulated for a special condition in the paper. GPS,BD （BeiDou NavigationSystem）,GLONASS and GALLIEO constellation are considered. By way of simulating and analysingDOP and constellation form, the conclusion of feasibility of autonomous navigation of spacecraftsbased on GNSS is given. Further, In order to improve real-time of the system, the method usingdifferent influence of GDOP is proposed.SINS into high-orbit spacecraft’s autonomous navigation for applying to mobile case forspacecraft navigation is introduced in the paper. And the scheduling algorithm of satellite SINSsystem, device error and error equations is also analyzed. According to their advantages anddisadvantages of SINS system and GNSS systems, a solution in close combination of autonomousnavigation, based on the use of satellite SINS/GNSS is proposed which runs a simulation analysisprogram based on close combination of autonomous navigation of satellite SINS/GNSS.Considering low precision in attitude estimation of integrated navigation system based onSINS/GNSS and insecurity of GNSS in wartime,CNS system is imported with SINS/GNSS as thebase. First, autonomous attitude determination and autonomous orbit determination are analysedbased on CNS.Then the autonomous navigation based on SINS/CNS is studid. At last,given thelimitation of GNSS system and CNS system,a scheme with multi-information fusion by way offederated filtering based on SINS/CNS/GNSS is put forward which attachs higher navigationprecision on autonomous navigation system and has better fault tolerance and real-time.