GPS原理25105The GPS satellite system
The first GPS satellite was launched in 1978.
A full constellation of 24 satellites was achieved in 1994.
Each satellite is built to last about 10 years. Replacements are constantly being built and launched into orbit.
A GPS satellite weighs approximately 2,000 pounds and is about 17 feet across with the solar panels extended.
Transmitter power is only 50 watts or less.
Sources of GPS signal errors
Ionosphere and troposphere delays
Signal multipath
Receiver clock errors
Orbital errors
Number of satellites visible
What's the signal?
a pseudorandom code
ephemeris data
almanac data
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