Integrated approach combining Doppler positioning and celestial navigation based on UKF

Doppler Navigation can be achieved by using the ground station wireless guidance system. It can obtain higher navigation accuracy. Limited by the geographic conditions, it is difficult for ground station wireless guidance system to realize the all orbit positioning and guidance. Moreover, with the development of the satellite application technology, the information jam and heavy burden is often happened in ground station measurement system. Furthermore, the anti-interference ablity of the ground station guidance system is not strong.As an autonomous guidance method, only the angle information of celestial bodies is utilized in celestial navigation system. The anti-interference ability of the celestial navigation system is strong. But the positioning precision is lower. In this paper, a complex navigation method combining the celestial navigation system and the single-pass Doppler frequency shift positioning system is studied. Firstly, the information from celestial navigation system and the Doppler positioning system are filtered using the UKF respectively. Then, the resulting two local optimal estimation values of the state variables are fused by intelligence information fusion methods. During the process of information fusion, the dynamic information assigning factor, which is optimized by the immune genetic algorithm (IGA), is utilized to gain the global optimal estimation values of the state variables. Finally, the navigation and positioning accuracy of the system is promoted. The proposed navigation approach makes use of the measurement devices in the satellites and the ground station and integrates the advantages of the two navigation methods. The computer simulation results show that the proposed approach is valid and the navigation accuracy and fault-tolerant ability of the system are improved.