Study of PNT Signal and Its Performance on LEO Communication Constellation

This paper studies the requirements of positioning and navigation time service for low orbit communication constellation. Based on the analysis of the LEO communication constellation characteristics, a signal design framework with position and navigation timing (PNT) function for broadcasting on LEO communication satellites is proposed. At the same time, the critical performance of common-frequency multiplexing is evaluated. The results show that, after reasonable design, the reduction of equivalent CNR caused by navigation signals is better than 0.28 dB, the reduction of equivalent CNR and tracking accuracy caused by navigation signals is acceptable, and the tracking error after deterioration is better than 0.43 m. The research results can reference the design and construction of a new generation space-based PNT system.