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SYSTEM 1st Launch Date Active Orbit Distance Orbit Angle # of Satellite Frequency Polarization Modulation & Coding Clock Error documentation
GNSS
Globalnaya navigatsionnaya sputnikovaya sistema
Oct 12, 1982 1995
Nov 2011
19,100km
25,440km
64.8° 30 FDMA
1,602+k*9/16MHz
1246+k*7/16MHz
CDMA
1202.025MHz
RHCP BPSK
Code_division multiple access
frequency_division multiple access method
5x10^-14 http://www.glonass-ianc.rsa.ru/en/index.php
GPS
Global Positioning System
1989 1994 20,200km 55° 24 1,575.42MHz 1.17645GHZ-L5
P(Y) 1,227.60MHz
RHCP bi-Phase Shift Keying
Code division multiple access
http://www.gps.gov/
Galileo
ESA
Nov 4, 2011 ? 23,222km 56° 3 1559-1592MHz
1164-1215MHz
1260-1300MHz
Right Hand Circular Pol. code division multiple access
quadrature phase shift keying & binary phase shift keying
http://www.gpsworld.com/gnss-system/galileo/galileo-frequency-signal-design-810?page_id=2
Beidou - Compass
China
Apr 13, 2007 ? 21,150km 55.5° 10
35 total
1561MHz
1268.52 MHz
1207.14MHz
BPSK http://waas.stanford.edu/CompassCode/COMPASS_E2.html

http://www.positim.com/navsys_overview.html
http://en.wikipedia.org/wiki/CDMA http://www.insidegnss.com/ http://ibank.tripod.com/lecture/GPS90.HTM http://www.gpsworld.com/gnss-system/news/german-space-agency-records-spectrum-new-glonass-l3-signal-11547 http://lea.hamradio.si/~s53mv/navsats/theory.html http://lea.hamradio.si/~s53mv/navsats/analog.html
img from PosiTim

File updated on December 02 2011 08:43:14.

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