If you wish to contribute or participate in the discussions about articles you are invited to contact the Editor
GLONASS Performances: Difference between revisions
Jorge.Moran (talk | contribs) |
Jorge.Moran (talk | contribs) |
||
| Line 7: | Line 7: | ||
|Logo=GMV | |Logo=GMV | ||
}} | }} | ||
One of the main objectives of the Global Navigation System (GNS) is to ensure GLONASS performance similar to GPS by the end of 2011. GLONASS poorer performance is the culmination of several factors:<ref name="GlonassFuture_InsideGNSS">[http://www.insidegnss.com/node/591 Russia Dwells on Glonass Future, InsideGNSS]</ref> | |||
* poorer on-board atomic clocks | |||
* less stability and predictability in the satellite orbits (and therefore less accuracy in GLONASS broadcast ephemerides) | |||
* fewer satellites providing signals | |||
* operational control and ground monitoring segment limited to Russian territory. | |||
The improvements carried out on the space, ground-based and user equipment segments have paid off, increasing the accuracy of GLONASS by 5 times in the last years and providing 100% availability in the Russia territorry and 98% global coverage. | |||
The Modernization of the Space Segment, with the launch of second and third generation of satellites | |||
==GLONASS Availability== | ==GLONASS Availability== | ||
| Line 47: | Line 57: | ||
|align="center"|26.3 % | |align="center"|26.3 % | ||
|} | |} | ||
==GLONASS accuracy== | |||
According to , GLONASS accuracy has five times improved in the last years. As it is shown in the figure on the right, in 2006 GLONASS Signal In Space Range Error (SISRE) at 1 sigma was in the order of 25 m. At the moment of this publication, July 2011, the accuracy of GLONASS is 6-7 metres, the same order as GPS. | |||
As Anatoly Shilov said at the 5th international forum on satellite navigation yesterday, June 1.He said the accuracy of the Russian navigation system would have to be improved to 2-3 metres in the years to come | |||
==Notes== | ==Notes== | ||
Revision as of 13:01, 7 July 2011
| GLONASS | |
|---|---|
| Title | GLONASS Performances |
| Author(s) | GMV |
| Level | Basic |
| Year of Publication | 2011 |
One of the main objectives of the Global Navigation System (GNS) is to ensure GLONASS performance similar to GPS by the end of 2011. GLONASS poorer performance is the culmination of several factors:[1]
- poorer on-board atomic clocks
- less stability and predictability in the satellite orbits (and therefore less accuracy in GLONASS broadcast ephemerides)
- fewer satellites providing signals
- operational control and ground monitoring segment limited to Russian territory.
The improvements carried out on the space, ground-based and user equipment segments have paid off, increasing the accuracy of GLONASS by 5 times in the last years and providing 100% availability in the Russia territorry and 98% global coverage.
The Modernization of the Space Segment, with the launch of second and third generation of satellites
GLONASS Availability
At the moment of this publication (April 2011) there are 27 GLONASS satellites in orbit although only 23 of them are operational. Availability performance (calculated as the percentage of time during which the condition PDOP ≤ 6 is valid at mask angles ≥ 5 deg) obtained with the current constellation is shown in the right figure.
| Date | Operational Satellites in constellation | Integral Availability Global | Integral Availability on Russian territory |
|---|---|---|---|
| 2011/07/06 | 23 | 99.5 % | 100 % |
| 2011/01/01 | 22 | 99 % | 100 % |
| 2010/01/01 | 15 | 73.6 % | 85.3 % |
| 2009/01/01 | 16 | 87.4 % | 96.6 % |
| 2008/01/01 | 12 | 48 % | 57.6 % |
| 2007/01/01 | 9 | 19.2 % | 26.3 % |
GLONASS accuracy
According to , GLONASS accuracy has five times improved in the last years. As it is shown in the figure on the right, in 2006 GLONASS Signal In Space Range Error (SISRE) at 1 sigma was in the order of 25 m. At the moment of this publication, July 2011, the accuracy of GLONASS is 6-7 metres, the same order as GPS.
As Anatoly Shilov said at the 5th international forum on satellite navigation yesterday, June 1.He said the accuracy of the Russian navigation system would have to be improved to 2-3 metres in the years to come