Table 1: GPS/GLONASS differences.

ParameterGPSGLONASS

ConstellationNumber of SV24 (expandable)24
Orbital planes63
Orbital altitude 20200 km19100 km
Orbit inclination 55°64.8°
Ground track period1 sidereal day8 sidereal days
LayoutAsymmetricSymmetric

SignalCarrier frequencies (MHz)1575.42
1227.60
1602 + K*0.5625  
1246 + K*0.4375
Ranging code frequencies (MHz)C/A: 1.023
L2C: 1.023
P: 10.23
M: 10.23
C/A: 0.511
P: 5.11
Multiple access schemesCDMAFDMA
Broadcast ephemeridesKeplerianECEF

ReferenceDatumWGS84PZ90.02
Time scaleGPS timeGLONASS time