High precision positioning technology based on commercial relay satellite

Although GPS, BeiDou and other systems have greatly improved their positioning accuracy and coverage, non-GNSS navigation and positioning technology is still a hot issue in the application scenarios of GNSS terminal denial of communication in the combat environment. This paper proposes a transmission satellite navigation system based on relay satellites, which hides the navigation signal with very low power spectrum in the host signal and transparently forwards it to the terminal via the relay satellite. This technology can provide a kind of concealed and minimal navigation service by using civil communication satellite. At the same time, for the case of deep spread spectrum, an efficient waveform design suitable for fast acquisition is proposed, that is, using Chirp-Noise Waveform (CNW) signal with time-frequency coupling characteristics to replace the traditional Pseudo-Noise (PN) code. Finally, the positioning accuracy and simulation verification are analyzed. Simulation results show that the system can achieve two-dimensional positioning accuracy of centimeter level.