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Archive for the 'Beginner’s Guide' Category
Wednesday, June 13th, 2007
- C1 ; Ranging to the satellite based on the Civil message.
- P1 ; Ranging to the satellite based on the Encrypted (high-security) message.
- L1 ; Number of cycles since satellite acquisition.
- P2 ; Ranging to the satellite based on the Encrypted (high-security) message.
- L2 ; Number of cycles since satellite acquisition.
Posted in Beginner's Guide, Hardware | No Comments »
Saturday, April 14th, 2007
- GLONASS is not complete. Whereas GPS has 32 satellites transmitting signals GLONASS only has 14 which does not guarantee world-wide coverage.
- GLONASS uses FDMA for its transmissions whereas GPS uses CDMA. in FDMA each satellite uses a different frequecy to transmit the same ranging code. in CDMA each satellite uses the same frequency with different ranging codes per satellite.
- GLONASS is providing a second Civilian signal on L2 which helps civilian users to properly eliminate the ionospheric error.
- GLONASS satellites are upgraded more often. This is due to a russian satellite design constraint or due to cost-saving measures but the GLONASS satellites have to be replaced much more often than GPS ones (every 5 to 7 yrs). This appears as a problem but it allows GLONASS to introduce new capabilities much faster than GPS.
Posted in Beginner's Guide, Guia de Inicio | No Comments »
Wednesday, September 27th, 2006
Posted in Beginner's Guide, Guia de Inicio | No Comments »
