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Today, GPS is more commonly known by the vehicle navigation solutions. However, the GPS system can be used for many other useful purposes. For example, many computer network time synchronization solutions, such as NTP time servers, use the atomic clocks aboard each satellite GPS for precise timing. The GPS system can be used as an accurate reference clock for synchronization of time-critical applications on computers and networks. This article describes how computer systems can use the GPS time and analyze what equipment is required to provide a precision time reference.

The GPS System is a United States military for world shipping. GPS is a space system consisting of a network of 24 satellites in orbit. Precise navigation and positioning is accomplished using precision timing signals and triangulation from several satellites. Each satellite orbit has an integrated atomic clock timing reference to provide ultra high precision time. Each satellite transmits data in time within some nanoseconds of the correct time to provide a positioning accuracy of better than 10m. This moment information can be used by NTP time servers and other Synchronization of computer equipment as a time reference of high precision. The great thing about GPS is that it works anywhere in the world and is totally free of air service.

Each GPS satellite transmits a radio signal low-power below the surface of the Earth. Two separate frequencies are used, designated L1 and L2. The band is L1 civil signal, transmitted at 1575.42 MHz L2 is the frequency of military, intended for ultra-high precision positioning. The radio signals transmitted from the satellites in the line of sight. The transmitted signal is easily powerful enough to pass through clouds, glass and plastics, but most is absorbed by the major material such as bricks, tiles and metals. The ideal location for a GPS antenna tends to be outdoors and ideally on a roof with the best possible view of the sky.

With the advent of GPS navigation equipment for the mass market, antennas and GPS receivers can be obtained at very reasonable cost. A GPS antenna is used to receive and amplify radio signals from GPS. While a GPS receiver decodes the information and presents it in a computer readable format. Many antennas are available with integrated receivers, but these have the disadvantage of only providing a few meters of cabling machine NTP time server or system computer. Marine Antennas are designed to withstand the worst of time, usually at one pole screw thread to provide a secure mounting system. These antennas provide the best solution for static time applications.

The GPS receiver is usually integrated into the NTP time server or encapsulated within an enclosure. A GPS receiver is a small device that amplifies Elecronic receives GPS signals from an antenna through a coaxial cable. The receiver decodes these signals and provides computer-readable output usually through an RS232 or USB interface. Most receivers provide decoded information, such as position, visible satellites, accurate time and a precise reference time pulse output.

The coaxial cable is used to provide a connection between the GPS antenna and receiver. The cable distance can be critical. The antenna of the GPS signal must be amplified enough to overcome cable losses associated with the cable run used. Improved quality of antennas generally provide more amplification (gain), plus The high quality coaxial cables can be used for signal losses much less per meter of cable that allows relatively long between an antenna and receiver. To extend cable GPS works even more amplifiers can be used to increase the signal transmitted by coaxial cable. Typically, a GPS amplifier can be found online on the coaxial cable and is powered from the receiver. Amplifiers can use multiple for extremely long cable.

A roof mounted GPS antenna can be prone to lightning and power surges. It is recommended that surge suppressors are used to protect NTP time server and expensive timing systems from damage. A surge suppressor is essentially a barrier that can be found online on the wire coax between the antenna and receiver which protects the recipient of any potential damage due to voltage spikes.

In summary, the GPS system provides a reference time of high precision NTP time servers and other computer equipment synchronization. This is an outdoor reliable service that can be used anywhere the world. And with the rise of car navigation systems of the technology needed to receive transmissions from GPS is continually falling in the price.

About the Author:

The author of this article, Dave Evans, provides a technical authoring service to a number of computer network timing hardware manufacturers. Dave's expertise in the field of atomic clock, NTP server and time server systems has led to him becoming a leading author in the field. Click here, if you would like to read more about NTP time server solutions.

Article Source: ArticlesBase.com - GPS Systems for Ntp Time Servers and Timing Applications

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