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Old 07-13-2019, 05:00 AM
Melbourne is offline
Join Date: Nov 2009
Posts: 5,198
The initial horizontal accuracy of GPS was around 20-30 m. The original horizontal accuracy of GLONASS was around 5-10 m, offering superior coverage at the poles, but inferior coverage over the rest of the world. The satalite patterns are different. GSM/GLONASS pre-dated differential GPS and RTK GPS, and one of the early uses of GLONASS was to provide base-station location for differential GPS

dual-receivers gave you something you couldn't get from either GLONASS or GPS individually: GLONASS was accurate, but often not in sight: GSM was in sight, but not very accurate.