360 gps

360 gps

NTP Server Static GPS Antenna Systems

The Global Positioning System (GPS) is often used by computer equipment, such as NTP Server systems to provide precise timing reference for time critical applications. This article gives an overview of GPS for timing applications and describes the equipment used to install a gps antenna in a static place.

Overview – Using GPS for Accurate Time

The Global Positioning System is a U.S. military for navigation in the world. The system consists of 24 satellites in orbit, each satellite is equipped with a clock atomic very precise edge synchronized to the UTC time. The satellites continuously broadcast time and position information. The time and position information can be obtained worldwide with a GPS receiver and antenna. The GPS works continuously in any whether conditions, anywhere in the world. Charges In addition, there is no initiation fee or subscription to use GPS systems. Many computer timing systems and NTP Server systems use GPS as an accurate reference external calendar.

The precision of GPS Timing Systems

Receivers GPS to provide very precise position and timing information. Typically, a GPS receiver can provide positioning information with an accuracy of 15m. NTP Server systems can obtain information on how the GPS to a resolution of a few nanoseconds.

The GPS signal

The GPS signal is transmitted very weak radio signal low-power, designated L1 and L2. L1 is the civilian GPS frequency transmitted at 1575.42 MHz. The signals travel by line of sight and can pass through clouds, glass and plastics but are blocked by objects such as metal and masonry. Therefore, the location ideal for a GPS antenna on the roof with a complete 360 degrees of sky. However, the installation often on the side of a building or in a window can provide satisfactory results. Generally, the better view of the sky, the more likely a good lock coherent signal.

GPS Timing Antenna Types

Acts of the GPS antenna as an amplifier to boost the GPS signal for transmission on a cable, typically coaxial, to the GPS receiver. GPS Timing Antenna comes with NTP server systems use a pole mounting system. The screws of the antenna a threaded pole for installation on roofs. This arrangement provides the GPS antenna to a rigid easily able to withstand winds violent without damage. Generally the GPS antenna is relatively small in size, measuring less than 90cm in diameter. Low-type patch antennas costs are also available, but they are generally better suited for vehicle applications.

GPS Antenna Cable Types and Cabling Distances

Distance cable that can be used by a GPS antenna depends mainly on the amplification of the GPS antenna and the quality of the coaxial cable used the facility. A GPS antenna typical schedule may be a gain of 35 dB. Relatively low quality as the RG58 coaxial cable has an attenuation of 0.64 dB / m at 1575 MHz. Therefore, a cable run of 55m can be obtained using RG58 cable. With a very high quality coaxial cable, such as LMR400, without using a serial cable to 200m can be achieved. However, very high quality coax can be expensive. A good price-performance compromise is LMR200 cable, which can be performed unaided 80m.

Extension cabling distance, with In-Line Amplifier GPS

In the GPS online amplifiers provide additional amplification of the GPS signal to increase the distance of cable between the antenna and GPS receiver. GPS Amplifiers are equipped in line with the antenna cable and get the power from the receiver via coaxial cable. No external power supplies are necessary. Typically, a GPS amplifier may add another 20 dB of gain, adding 30 m of low-quality RG58 coax, 40m of LMR200 coax or 100m LMR400 High quality coax. In addition, multiple in-line amplifiers may be used to further increase the distance by cable.

Sharing a single antenna between multiple receivers – GPS Splitters

GPS Splitters allow a single GPS antenna to be used by two or more server systems NTP. The splitter separates the GPS signal received by the GPS antenna in several outputs for synchronizing multiple NTP servers. Splitters are generally available GPS with 2, 4 or 8 outputs.

Protecting GPS – GPS Surge Suppressor

Surge suppressors protect expensive NTP server equipment of electrostatic discharge such as lightning, that may be captured by a GPS antenna mounted external. Surge suppressors are installed on the cable line coax between the antenna and receiver, ideally where the cable enters the building. Surge suppressors require a soil with low impedance to discharge any outbreak received. The surge requires no power supply or additional cabling.

About the Author

Dave Evans develops atomic clock time synchronisation systems to ensure accurate time on PC networks. Click here to find out more about GPS NTP Server systems.

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