atomic clock
[physics] A clock that keeps time by the radiation frequency associated with a particular atomic reaction. Atomic clocks are used in official timekeeping.
is announcing the general availability of a tiny, low-power atomic oscillator. The SA.45s Chip Scale Atomic Clock (CSAC) provides the accuracy and stability of atomic clock technology while delivering dramatic improvements in size, weight, ...
Atomic Clock
A very precise clock that operates using the elements cesium or rubidium. A cesium clock has an error of one second per million years. GPS satellites contain multiple cesium and rubidium clocks.
Atomic Clock
A type of clock that uses an atomic resonance frequency standard as its counter.
Average Speed field ...
The atomic clocks aboard the satellites maintain their time to a very high degree of accuracy. However, there will always be a slight variation in clock rates from satellite to satellite.
The satellite's atomic clocks experience noise and clock drift errors. The navigation message contains corrections for these errors and estimates of the accuracy of the atomic clock, ...
When completed the system will consist of 24 satellites equipped with radio transmitters and atomic clocks.
Today, longitude is more accurately measured with atomic clocks and satellites. The Earth is still divided equally into 360° of longitude with 180° being east of the Prime Meridian and 180° west.
It refers local time throughout the world to time at the prime meridian, and is based on atomic clocks, but is periodically artificially adjusted so as to always remain within 0.9 seconds of universal time.
Because GPS receivers do not have atomic clocks, there is a great deal of uncertainty when measuring the size of the spheres shown in the diagram on the previous page.
Using atomic clocks (accurate to within one second every 70,000 years) and location data, each satellite continuously broadcasts the time and its position.
user's control include degradation of the transmitted signal, delays caused by the earth's atmosphere (troposphere and ionosphere), minor disturbances caused by gravitational pulls and solar radiation pressure, and inaccuracies in the atomic clocks ...
Each of the satellites contain atomic clocks, which are accurate to within a few hundred nanoseconds. These clocks cost about $100,000 apiece! Although the clocks in the GPS receivers are quite accurate, they are certainly not this accurate.
In recent years, we have taken great strides in achieving that goal by using earth orbiting satellites equipped with ultra-stable atomic clocks -- a modern version of the chronometer first developed by John Harrison that allowed us to solve the ...
Each satellite contains four precise atomic clocks (Rubidium and Cesium standards) and has a microprocessor on board for limited self-monitoring and data processing.
Each satellite carries precise atomic clocks to generate the timing information needed for precise positioning. A navigation message is also transmitted on both frequencies.
The current system, called Coordinated Universal Time (UTC), became the standard legal reference of time for the world in 1972. UTC is determined from six atomic clocks and this time is then applied relative to the 24 time zones found on our planet.
 See also: Satellite, Information, GPS, Cover, Navigation
  
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