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Open AccessArticle

Calibration of GLONASS Inter-Frequency Code Bias for PPP Ambiguity Resolution with Heterogeneous Rover Receivers

1
Institute of Urban Smart Transportation & Safety Maintenance , Shenzhen University, Shenzhen 518060, China
2
GNSS Research Center, Wuhan University, Wuhan 430079, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(3), 399; https://doi.org/10.3390/rs10030399
Received: 9 January 2018 / Revised: 9 February 2018 / Accepted: 16 February 2018 / Published: 5 March 2018
Integer ambiguity resolution (IAR) is important for rapid initialization of precise point positioning (PPP). Whereas many studies have been limited to Global Positioning System (GPS) alone, there is a strong need to add Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS) to the PPP-IAR solution. However, the frequency-division multiplexing of GLONASS signals causes inter-frequency code bias (IFCB) in the receiving equipment. The IFCB causes GLONASS wide-lane uncalibrated phase delay (UPD) estimation with heterogeneous receiver types to fail, so GLONASS ambiguity is therefore traditionally estimated as float values in PPP. A two-step method of calibrating GLONASS IFCB is proposed in this paper, such that GLONASS PPP-IAR can be performed with heterogeneous receivers. Experimental results demonstrate that with the proposed method, GLONASS PPP ambiguity resolution can be achieved across a variety of receiver types. For kinematic PPP with mixed receiver types, the fixing percentage within 10 min is only 33.5% for GPS-only. Upon adding GLONASS, the percentage improves substantially, to 84.9%. View Full-Text
Keywords: GLONASS; precise point positioning; ambiguity resolution; uncalibrated phase delay; inter-frequency code bias GLONASS; precise point positioning; ambiguity resolution; uncalibrated phase delay; inter-frequency code bias
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Liu, Y.; Gu, S.; Li, Q. Calibration of GLONASS Inter-Frequency Code Bias for PPP Ambiguity Resolution with Heterogeneous Rover Receivers. Remote Sens. 2018, 10, 399.

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