Local High-precision Differential Positioning Technology based on Commercial Communication Satellites

China Area Positioning System (CAPS) rents commercial communication satellites to realize the integration of bent-pipe navigation and communication. Aiming at the limitation of high cost of CAPS, we start with describing the technical characteristics of the bent-pipe navigation satellite system and the existing resources of communication satellite. We utilize the transparent bent-pipe channel of commercial communication satellite to realize the overlap communication, and overlap the navigation signal with extremely low power spectrum in the host signal. At the same time, in order to solve the problem of long acquisition time of time-frequency two-dimensional search of traditional Pseudo-Noise (PN) code, the navigation waveform is designed by using the characteristics of time-frequency coupling of Chirp-Noise Waveform (CNW) signal. The carrier phase differencing is implemented according to the short-term baseline communication of the reference station. Finally, a navigation system with flexible deployment, high-precision positioning and low cost is built. The simulation results show that the system can achieve centimeter-level accuracy of two-dimensional positioning.