TY - GEN
T1 - A weighting Method for Code and Phase Observations in Precise Point Positioning∗
AU - Zhang, Qieqie
AU - Zhao, Long
AU - Zhou, Jianhua
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/8
Y1 - 2018/8
N2 - Code pseudorange and Phase-range are two types of observation with different accuracy for Precise Point Positioning (PPP). An appropriate weight ratio between pseudorange and phase observations is important to improve the convergence time and positioning accuracy of PPP. In general, however, a priori constant value is chosen as the weight ratio that is usually inaccurate. In this paper, the impact of different weight ratios on positioning results are researched and a weighting method based on variance component estimation for code pseudorange and phase-range observations is proposed. In this method, an optimal weight ratio is determined according to the principle that the unit weight estimation variance of each types of observation should be equal. Both static and kinematic tests based on the measured data of GNSS are conducted to analyze the relationship between different weight ratios and positioning performance and to assess the effectiveness of the weighting method. The results show that in static mode, the performance is gradually improved with the weight ratio between pseudorange and phase increasing until it is greater than a certain ratio; in kinematic mode, the positioning accuracy and convergence time are also improved with the weight ratio increasing, while the performance has dropped a little bit when the weight ratio greater than a certain threshold. The proposed weighting method can obtain the optimal weight ratio and get the better positioning results.
AB - Code pseudorange and Phase-range are two types of observation with different accuracy for Precise Point Positioning (PPP). An appropriate weight ratio between pseudorange and phase observations is important to improve the convergence time and positioning accuracy of PPP. In general, however, a priori constant value is chosen as the weight ratio that is usually inaccurate. In this paper, the impact of different weight ratios on positioning results are researched and a weighting method based on variance component estimation for code pseudorange and phase-range observations is proposed. In this method, an optimal weight ratio is determined according to the principle that the unit weight estimation variance of each types of observation should be equal. Both static and kinematic tests based on the measured data of GNSS are conducted to analyze the relationship between different weight ratios and positioning performance and to assess the effectiveness of the weighting method. The results show that in static mode, the performance is gradually improved with the weight ratio between pseudorange and phase increasing until it is greater than a certain ratio; in kinematic mode, the positioning accuracy and convergence time are also improved with the weight ratio increasing, while the performance has dropped a little bit when the weight ratio greater than a certain threshold. The proposed weighting method can obtain the optimal weight ratio and get the better positioning results.
UR - https://www.scopus.com/pages/publications/85082459018
U2 - 10.1109/GNCC42960.2018.9018935
DO - 10.1109/GNCC42960.2018.9018935
M3 - 会议稿件
AN - SCOPUS:85082459018
T3 - 2018 IEEE CSAA Guidance, Navigation and Control Conference, CGNCC 2018
BT - 2018 IEEE CSAA Guidance, Navigation and Control Conference, CGNCC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2018 IEEE CSAA Guidance, Navigation and Control Conference, CGNCC 2018
Y2 - 10 August 2018 through 12 August 2018
ER -