Using GPS For NTP Server Time Synchronisation

UTC time is the same worldwide; it does not vary with time zone or daylight saving time. UTC is a high precision atomic time standard maintained by atomic clocks located in national standards laboratories. UTC has uniform seconds, as defined by the International Atomic Time (TAI) institute.Each satellite broadcasts time and positioning information as a very low-power radio frequency transmission. The US Military designates two frequencies, one for civilian use coded L1, and one for military use coded L2. The L1 frequency is broadcast at 1575 MHz (1.575 GHz). These weak radio transmissions can easily pass through less dense materials, such as plastics and glass, but are blocked by denser materials, such as metal and brick. However, newer more sensitive receivers are being developed for indoor operation.A GPS antenna needs to have a 'line-of-sight' view of satellites. Therefore, a roof-mounted antenna is ideal, with a full 360-degree view of the sky. Quite often however, an antenna located on the side of a building is adequate, provided the horizon is not too obscured by trees or buildings. The antenna is essentially a signal amplifier; it boosts the received signals for transmission along a cable to a receiver. Fifty-ohm coax cable is generally used to transfer signal information between the antenna and receiver.The receiver decodes the signals received by the antenna into a useable, easily readable format. The most common protocol used by receivers is NMEA, which consists of a number of transmitted sentences. Each NMEA sentence provides a packet of information consisting of time, date and positioning information.

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