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What type of cable is used for a GPS receiver?
coaxial cable
A coaxial cable transmits GPS signals from the antenna to timing receiver. It also conducts 5 volts from the receiver to power the antenna and other elements of the antenna system if necessary.
What is GPS antenna?
A GPS antenna is a radio frequency antenna that provides connectivity with the Global Positioning System , a proprietary, satellite-based radio navigation system designed, created, and owned by the United States Government.
What is the maximum length of a coaxial cable?
Coaxial cable can be cabled over longer distances than twisted-pair cable. For example, Ethernet can run approximately 100 meters (328 feet) using twisted-pair cabling. Using coaxial cable increases this distance to 500m (1640.4 feet).
How is the delay of the signal in the GPS receiver?
In a gps receiver there is an inevitable time delay in the signal travelling in the antenna lead to the circuitry of the receiver. In a typical 5 metre lead the delay is about 15 nanoseconds, which, added on to the time for the signal to travel from the satellite to the antenna, would mean a serious inaccuracy if it was not compensated for.
How is GPS position determined at the antenna?
GPS position as well as precise UTC time is determined at the point the GPS signals are received at the antenna. Since the antenna is typically attached to the GPS timing receiver via a cable, signal propagation delays through the cable cause the time calculated by the receiver to be slightly behind UTC.
How is cable latency removed from a GPS receiver?
Cable delay is removed by advancing the antenna signal inside the GPS receiver. In this example, advancing the signal +62 nanoseconds removes all cable latency. Solutions such as the GPS Down/up converter also introduce signal latency but this latency can also be removed by adjusting the signal.
How does advancing the antenna remove cable delay?
Cable delay is removed by advancing the antenna signal inside the GPS receiver. In this example, advancing the signal +62 nanoseconds removes all cable latency.