Specifications GPS GLONASS
Orbital planes 6 and spaced by 60 degree 3 and spaced by 120 degree
Satellites per orbital plane 4 and unevenly spaced 8 and evenly spaced
Orbital plane inclination 55 degree 64.8 degree
Orbital radius 26560 Km 25510 km
Orbital period About 11 hours and 58 minutes (1/2 of sidereal day) 11 hours and16 minutes
Repeat ground track every sidereal day every 8 sidereal days
carrier signals L1 band: 1575.42 MHz ,L2 band: 1227.60 L1 band
1602+ k x 9/16) MHz
L2 band: (1246 + k x 7/16) MHz ,
where k is the channel number
codes different for each satellite, C/A code on L1 and P-code on L1/L2 same for all the satellites , C/A code on L1 and P-code on L1/L2
code frequency C/A code - 1.023MHz and P-code 10.23 MHz C/A code - 0.511 MHz and P-code 5.11 MHz(half than GPS)
Clock data In GPS Clock data are transmitted in terms of Clock offset, frequency offset, frequency rate and allow the calculation of the difference between individual GPS satellite's time GPS system time. Broadcasted Clock and frequency offset provides difference between time of GLONASS satellite and GLONASS system
orbital data Modified keplerian orbital elements every hour satellite position, velocity and acceleration every half hour
