GPS satellite earth station in the application and development of interface circuits

Abstract: This paper focuses on the time demands of satellite ground stations, GPS timing receivers satellite ground station in Guangzhou, FY-ground data receiving system, and GPS timing receivers for time code output with the capacity to do less than developed interface circuit.

Keywords: satellite earth stations; time; GPS; interface circuits: development of

GPS (clobal Positioning System) is the acronym for Global Positioning System and referred to, is the United States following the transit satellite navigation system developed after up the second generation of satellite navigation, positioning and timing system. The development of the system began in 1973, after more than 20 years three stages of development and testing at a cost of 20 billion U.S. dollars, fully completed in 1994. It is a sea, land and air for full-time and three-dimensional navigation and positioning capabilities of the new generation of satellite navigation and positioning system. Early use is limited to the U.S. military is now open to the people.


1 GPS in the National Satellite Meteorological Center and the ground station application

20 century, 80 -90 years, the National Satellite Meteorological Center, and three ground stations (Beijing Railway Station, Guangzhou Station, Urumqi station) time source, and from the local configuration of the rubidium atomic frequency standards and precision prison and high stability crystal oscillator, and through short-wave receiver and the clock of the Shaanxi Astronomical Observatory of hydrogen when the local time in phase with the Shaanxi Astronomical Observatory of cyanide bell consistent.


starting from the end of 1999, the National Satellite Meteorological Center, and three ground stations are from the GPS time source of rubidium atoms on the frequency standards. Guangzhou Station has purchased 3 sets of timing-based GPS receiver.

GPS timing receiver is in the type of OEM (original data receiver board) is made on the basis of. GPS timing receiver general serial time code only for the local display.


2 satellite earth station with the time demands

satellite earth station on time, very demanding. Because polar orbit meteorological satellite in 860 km height from the ground over the center of the earth as a concentric circular motion, the instantaneous linear velocity of 7.9km / s. Over the satellite into the earth station, the servo tracking antenna to track the satellite until the satellite country. Servo tracking antenna on the polar orbit meteorological satellite tracking and reception timing used in the whole system, servo-tracking antenna that is run under the track forecast, and track forecast is prepared on the basis of time, only time and accurate, the antenna can tracking accuracy. In some ways, the polar orbit meteorological satellite tracking accuracy depends on the time accuracy. Therefore, high stability and high precision satellite ground station time is very important, continuous, stable and reliable time is the fundamental guarantee for business operations.



addition to requiring high servo stability and precision of the time, the computer system operation control computer, contour display, storage, forwarding Weiji also requires high precision and high stability of the time.

With high stability and high precision time source, the ground station can be achieved between the station equipment all the time on-line synchronization with the satellite center station in time synchronization, time station and the synchronous satellite . On this basis, can be well done and the satellite image to track the satellite data reception and forwarding.

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