GNSS-R Altimetry Method with Multi-system Single-Frequency Tight Integration
Objectives:Global navigation satellite system-reflectometry(GNSS-R)technology can receive direct navigation satellite signals and reflected signals from the water surface at the same time.The code,carrier-phase and signal-to-noise ratio information are used to retrieve water surface height.Due to the ob-servations of shore-based devices,especially single-frequency devices,are insufficient in the partially con-fined environment,the performance of GNSS-R technology based on carrier-phase processing is degraded.Therefore,we propose a tight integration model of overlapping frequency B1C/L1/E1 signals in global navigation satellite system to improve the performance of GNSS-R.Methods:Differential inter-system bias(DISB)is evaluated from the point of view of the antenna polarization mode,and the altimetry performance of GNSS-R based on tight integration model is assessed.Results:The results show that:(1)There is no obvious relationship between the polarization mode of the antenna and DISB,and GNSS-R using the ho-mogeneous receivers can ignore the effect of DISB.(2)Both the loose and tight integration model can achieve the fixed rate of 99.75％and the standard deviation is less than 1 cm in the good satellite visual environ-ment.When the number of visible satellites in a single navigation satellite system is less than 4,the tight in-tegration model can still achieve the fixed rate of 94％,and the standard deviation is less than 1 cm.Con-clusions:The tight integration model can significantly reduce the limitations of the installation environment on GNSS-R device.
NETL
NSTL
万方数据
维普
