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A New Method of Real-Time Kinematic Positioning Suitable for Baselines of Different Lengths

Published online by Cambridge University Press:  11 August 2020

Jinhai Liu
Affiliation:
(National Time Service Center, Chinese Academy of Sciences, Xi'an, China) (University of Chinese Academy of Sciences, Beijing, China)
Rui Tu*
Affiliation:
(National Time Service Center, Chinese Academy of Sciences, Xi'an, China) (University of Chinese Academy of Sciences, Beijing, China) (Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi'an, China)
Rui Zhang
Affiliation:
(National Time Service Center, Chinese Academy of Sciences, Xi'an, China) (Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi'an, China)
Xiaodong Huang
Affiliation:
(National Time Service Center, Chinese Academy of Sciences, Xi'an, China) (University of Chinese Academy of Sciences, Beijing, China)
Pengfei Zhang
Affiliation:
(National Time Service Center, Chinese Academy of Sciences, Xi'an, China) (University of Chinese Academy of Sciences, Beijing, China)
Xiaochun Lu
Affiliation:
(National Time Service Center, Chinese Academy of Sciences, Xi'an, China) (University of Chinese Academy of Sciences, Beijing, China) (Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi'an, China)
*

Abstract

This study introduces a new real-time kinematic (RTK) positioning method which is suitable for baselines of different lengths. The method merges carrier-phase wide-lane, and ionosphere-free observation combinations (LWLC) instead of using pseudo-range, and carrier-phase ionosphere-free combination (PCLC), or single-frequency pseudo-range and phase combination (P1L1). In a first step, the double-differenced wide-lane ambiguities were calculated and fixed using the pseudo-range and carrier-phase wide-lane combination observations. Once the double-differenced wide-lane integer ambiguities were known, the wide-lane combined observations were regarded as accurate pseudo-range observations. Subsequently, the carrier-phase wide-lane, and ionosphere-free combined observations were used to fix the double-differenced carrier-phase integer ambiguities, achieving the final RTK positioning. The RTK positioning analysis was performed for short, medium, and long baselines, using the P1L1, PCLC, and LWLC methods, respectively. For a short baseline, the LWLC method demonstrated positioning accuracy similar to the P1L1 method, and performed better than the PCLC method. For medium and long baselines, the positioning accuracy of the LWLC method was slightly higher than those of the PCLC and P1L1 methods. In conclusion, the LWLC method provided high-precision RTK positioning results for baselines with different lengths, as it used high-precision carrier-phase observations with fixed ambiguities instead of low-precision pseudo-range observations.

Type
Research Article
Copyright
Copyright © The Royal Institute of Navigation 2020

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