Active and Passive
Active and Real-time
Delay and Real-time
Delay and Passive
Have a larger transmitter power
Have more sensitive equipment.
Operate as a repeater station in space
Operate over a wider-frequency range.
Code division multiple access (CDMA).
Time division multiple access (TDMA).
Demand assigned multiple access (DAMA).
Frequency Division Multiple Access (FDMA)
Code division multiple access (CDMA)
Time division multiple access (TDMA)
Demand assigned multiple access (DAMA)
Frequency Division multiple access (FDMA)
One statute mile
One nautical mile
69 statute miles
69 nautical miles
Atomic clock oscillators
Apparent constellation movement.
The moon's rotation around the sun
The apparent motion of the sun in the sky
Amplitude modulation and pulse modulation
United States Naval Observatory
International Bureau of Weights and Measures.
Precision Measurement Equipment Laboratory.
National Institute of Standards and Technology.
Identical time code formats.
Different time code formats.
Humidity and aging.
Temperature and aging.
Humidity and operating frequency.
Temperature and operating frequency.
Crystals resonate when an electric charge is applied.
Atoms release energy at a particular resonant frequency.
Atoms are sensitive to temperature and directional effects.
When atoms are split they produce predictable nuclear reactions.
Transmitting one signal over multiple transmission paths
Transmitting one signal multiple times over a single transmission path.
Combining multiple signals for transmission over a single transmission path.
Combining multiple signals for transmission over separate, individual transmission paths.
Frequency of light.