Analysis of Ranging and Positioning Performance Influenced by Signal Coherence Parameters

Abstract

Multi-band, multi-service and multi-modulation are new trends of GNSS development. Since novel modulation types like BOC/MBOC and multiplex techniques of navigation signals have been utilized, the composite navigation performance is indeed improved. With increased modulated signals broadcasting on single frequency in satellite, Signal coherence parameter has become one of the most important monitoring parameter. For satellite navigation system, the coherence of phases between pseudo-random codes and between carriers are the prerequisite for realization to pseudo-random code ranging and carrier phase ranging, and they are also two of the main factors affecting on the satellite signal system. This paper discusses how the coherence of phases between pseudo-random codes, between carriers and between carrier and code affect pseudo-random range measurement, carrier phase range measurement and carrier phase smoothing pseudo range process. Furthermore, the relationship between code minus carrier and code phase carrier phase coherence is discussed. Then, the positioning error and code minus carrier measurement is given by the simulation of carrier phase smoothing pseudo range process. In the end, we test code minus carrier parameter and code phase carrier phase coherence parameter using the system built by ourselves.