Algorithms to Calibrate and Compensate for GLONASS Biases in GNSS RTK Receivers Working with 3rd Party Networks

Aleksey Boriskin, Gleb Zyryanov

Abstract:	GLONASS hardware biases is well known problem in GNSS receivers because of FDMA technique used in this Satellite system. Signals from different GLONASS Satellites pass through different parts of Front-End RF which has Group Delay (GD) variations. As a result each GLONASS Satellite gets frequency dependent delay which finally appears as a bias in pseudo-range and carrier phase measurements. When developing positioning algorithms in GNSS receivers, one has to take this fact into consideration. Bias problem exists for standalone positioning as well as for differential positioning including RTK and Network RTK solutions. In latter cases final GLONASS biases appear as differential biases caused by difference in GD between rover and Base/Network receivers. In the most of the cases when base and rover receivers are of the same hardware design (manufacture), these differential biases can be negligible. However, when Base/Network and rover belong to different manufactures, the differential biases (if not treated properly) can prevent from getting reliable centimeter level position solution. This paper relates to effective support of differential GLONASS pseudo-range and carrier phase biases with focusing on RTK application. This support includes effective On The Fly (OTF) pseudo-range and especially carrier phase bias calibration/compensation. These algorithms allow finally GPS+GLONASS rover to get advantage over GPS-only rover for all RTK applications against 3rd party Base/Network.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	376 - 384
Cite this article:	Boriskin, Aleksey, Zyryanov, Gleb, "Algorithms to Calibrate and Compensate for GLONASS Biases in GNSS RTK Receivers Working with 3rd Party Networks," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 376-384.
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