Satellite antenna pointing vector aiding method for SINS/GPS integrated navigation system

In order to compensate the bad observability of SINS/GSP integrated navigation system, a new method by aiding attitude information of high-precision communication satellite antenna pointing vector (SAPV) to SINS/GPS integrated navigation system is proposed. By utilizing the mathematical model of the SAPV information to aid the integrated navigation system, the observability of attitude errors is analyzed. The relationship between SAPV and navigation error is given, which shows the feasibility for using the method of aiding integrated system with SAPV, and then the mathematical model fulfilled by Federated filter is set up. The simulation results show that the estimation precision of azimuth error could be improved by one order of magnitude by this new method, which is less than 10', and the horizontal attitude error could be less than 2'. This method can improve the precision of the attitude measurement simply by using reliable information confusion algorithm without any other hardware.