comAuthor
• David Evans
Source
• articlesbase.com
The GPS is a satellite navigation system operated by the UP Department of Defense. It essentially provides a toll free civil navigation and timing service. GPS is used primarily as a highly accurate global positioning and navigation reference. However, a byproduct of precise positioning, each satellite in Earth orbit also has a built-in high precision atomic clock synchronized unit from the U.S. Naval Observatory (USNO). And 'then provide a high time-precision-timing systems, as an ideal NTP. This article attempts to describe how long the network server can obtain accurate time to provide a 'clear indication of computer time synchronization. It also discusses how NTP server, the atomic time via GPS to generate a time reference for the supply of computer networks.The use the GPS is a constellation of 24 satellites in orbit, each with high-precision atomic clock synchronization systems on board. The system offers a complete service that will receive anywhere on the face of the planet. Exact-time data is continuously transmitted by each satellite. Time information can be obtained easily with modern equipment.Time low-cost antenna and receiver from each satellite, as the Coordinated Universal Time (UTC), which is virtually identical to broadcast the Greenwich Mean Time (GMT). UTC is the same worldwide, but does not change with the time zone and daylight saving time. UTC has a high-precision atomic time standard which is of atomic clocks in national laboratories maintenance standards. UTC has uniform seconds by International Atomic Time (TAI), satellite broadcasts institute.Each time and position information is defined as very low-power radio frequency transmission. The U.S. military refers to two frequencies, one civilian use of L1 and L2 encrypted code for a military use. The L1 frequency is 1575 MHz (1.575 GHz) broadcast. These weak radio programs can easily pass through less dense materials such as plastic and glass, but are more dense materials such as blocks of metal and brick, gps navigation systems, . However, newer more sensitive receivers operation.A internal GPS antenna designed to be a "line-of-sight have" view of satellites. Therefore, an antenna on the roof is ideal, with a 360 degree view of the sky. Often, however, the antenna on the side of a building is sufficient, provided that the horizon is not too obscured by trees or buildings. The antenna is essentially a signal amplifier, increases the received signals for transmission over a cable to a receiver. Fifty-ohm coaxial cable is typically used for the decoded information signal antenna and receiver receives signals from the receiver antenna into a usable, easily readable format. The protocol most commonly used by NMEA recipients, which consists of a number of records transferred. Each NMEA provides a package of information, consisting of time, date and positioning information. The Protocol also provides additional information such as the visible satellites and satellite guidance sky.NTP servers use a special receiver for synchronization applications to measure. Time receivers have additional features and circuit for a time reference of high accuracy guaranteed. They also lead an investigation site for automated satellite-synchronized clocks to compare. time servers also use a precise pulse per second (PPS) output generated by the receiver. PPS output provides a trigger, gps navigation systems, highly accurate reference timetable for purposes.The GPS system is ideal for applications synchronize computer networks. With the "free-to-air system may NTP time server synchronized within a few microseconds of UTC.
Dave Evans has written a number of articles on time server and network timing. Click here, if you would like more information on NTP server systems.
