| 单词 | gps | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 | GPSGPSgpsGPSGPSn.
gps→ 全球定位系统zhCN
GPSGPS:see navigation satellitenavigation satellite,artificial satellite designed expressly to aid the navigation of sea and air traffic. Early navigation satellites, from the Transit series launched in 1960 to the U.S. navy's Navigation Satellite System, relied on the Doppler shift. ..... Click the link for more information. . GPSSee global positioning system.GPSgpsGPSGPS(1) (General Print Server) An IBM mainframe feature that lets TN3270 clients access LPD/LPR printers via the SNA/VTAM network. See TN3270 and VTAM.(2) (Global Positioning System) A satellite-based radio navigation system run by the U.S. Department of Defense, officially known as NAVSTAR GPS (see also GLONASS, Galileo and Beidou). Originally created for the military, today, GPS receivers are built into all smartphones and millions of cars and trucks. See in-dash navigation, CarPlay, Android Auto and portable GPS. GPS vs. the "Nav" Technically, the GPS is the satellite system, whereas a "navigation" system or "nav" is the GPS receiver that picks up the signals. In practice, most people refer to their navs as their GPS. Three or Four Signals Are Required At least four satellites are on the horizon at all times, which is sufficient to compute the current latitude, longitude and elevation anywhere on earth to within 15 to 70 feet (see latitude). If only three signals are present due to interference, elevation cannot be derived. If fewer than three, the location cannot be computed unless the nav is built into the vehicle and interfaces with the speedometer (see in-dash navigation). The Satellite System In six different orbits approximately 12,500 miles above the earth, 24 medium-earth orbit (MEO) satellites circle the earth every 12 hours. They constantly transmit their current time based on atomic clocks and current location on two frequencies in the L-band (L1: 1575.2 MHz; L2: 1227.6 MHz). Most navs pick up L1, while more advanced receivers pick up both for greater accuracy. The nav calculates the distance to the satellites by comparing the times the transmitted signals were sent with the times received. By knowing the precise locations of the satellites at any given moment, the nav computes the current coordinates using trilateration, a method similar to how ship captains navigated for centuries (see triangulation). First Launched in 1978 In this decades-old system, satellites are periodically replaced. In addition, worldwide government and commercial monitoring networks use earth stations to improve accuracy; for example, enabling farm equipment to plant ultra-precise rows of crops (see GPS augmentation system). See social navigation, vehicle tracking, reality view, GPS augmentation system, mobile positioning, LORAN, MEO, GNSS, Galileo and geocaching.
GPSGPSAbbreviation for:gastrocnemius-plantaris-soleus General Pharmaceutical Services general practice strategy Goodpasture syndrome grey platelet syndrome GPS
GPS
Synonyms for GPS
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GPS - a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time difference for signals from different satellites to reach the receiver
