Positioning Precisions of GLONASS and GPS are Similar – Test Result

Recently, Russia stated that GLONASS’ precision was close to the GPS’ one. Marker news paper decided to verify if it’s true. Experts entered the streets of Moscow in order to compare positioning accuracy of the Russian and US navigation systems. The results are visible: GLONASS precision has almost caught up with GPS.
The course of the test implied verification of the GLONASS monitoring services wrt GPS’ ones. The objective was to position transport vehicles and to define their speed. Three GPS-receivers and three GLONAS-compatible terminals were involved in the testing, each with an individual antenna, all installed in a single car.

The test equipment of similar quality class had the same production date, thus providing the opportunity to minimize the errors and to mitigate individual inaccuracies for each device.

The objective was very simple: motion along the predefined path, and comparison of the positioning stability and speed definition accuracy. The goal was to compare operations of the two systems in open territory, in the urban streets with buildings, and under high electromagnetic radiation.

In general, both systems displayed positive results. The routes based on their data coincided; positioning accuracy was high, the number of errors was negligible.

Behavior of both systems was assured in the open territory, as well as in the street surrounded by buildings.
However in a narrow ‘canyon’ in the down town, GPS inaccuracy reached the value of more than 15m, thus confirming that GLONASS precision is higher in the city center with a lot of buildings, as GLONASS was absolutely accurate at this time.

To conclude, GLONASS today can provide anti-hijacking and application monitoring solutions, comparable with GPS. Though Russian Navigation System today has a bit more random errors than GPS, it shows satisfactorily results.

Average error value of the systems is almost on the same level, thus justifying great prospective for GLONASS which is still enlarged.

According to Sergey Revnivykh, TSIIMASH Deputy Director and Roscosmos’ GLONASS curator, states that GLONASS positioning accuracy will improve in the nearest future due to deployment of the orbital constellation and its enhancement by new-generation GLONASS-K satellites. The precision can reach 70-80 cm. According to him, proposals for the new Federal Special Program imply some measures aimed at improving GLONASS signal quality, Marker informs.

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