GPS


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GPS:

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.
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GPS

See global positioning system.

GPS

gps

Abbr. for “gallons per second.”

GPS

GPS

(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.


An Early Car Nav
In 1996, Sony's NVX-F160 was one of the first vehicle navigation systems, and it was able to find the nearest restaurant and hotel. (Image courtesy of Sony Corporation.)







GPS in the Woods
Portable navigation works everywhere. The flat object pointing up is the antenna. See portable GPS.







Navigation App in a Laptop
The Delorme Street Atlas offers extensive details including satellites in range (#15 just lost signal), elevation (Elv), azimuth (Az) and signal-to-noise ratio (dB). NET means: N=navigation satellite, E=ephemeris data available and T=being tracked (yellow object on dashboard is the GPS antenna).


Navigation App in a Laptop
The Delorme Street Atlas offers extensive details including satellites in range (#15 just lost signal), elevation (Elv), azimuth (Az) and signal-to-noise ratio (dB). NET means: N=navigation satellite, E=ephemeris data available and T=being tracked (yellow object on dashboard is the GPS antenna).







It Doesn't Get Better Than This
Tesla's navigation system is unlike any other. The 17" touchscreen displays more map area than any other nav screen.
References in periodicals archive ?
"Patients complain to us that many GPs are so concerned with ticking all the boxes that will bring extra money - checking blood pressure, cholesterol and so on - there is little time left for their current health problem."
Use of un-keyed GPS devices is only authorized for training and for research and development programs.
It is clear from the results that fewer than half of surveyed GPs are aware what private hospital groups currently offer in areas such as the provision for complex surgery.
"We need more GPs and nurses to cope with the level of demand."
These adversaries intend to minimize this GPS advantage in the next conflict by contesting the military's assured access to the GPS signal.
Think of GPS as the geographic equivalent of the global pager network: rather slow, but extremely reliable and widespread.
The US Air Force from Cape Canaveral Air Force Station, FL, successfully launched a Lockheed Martin-built Global Positioning System (GPS) satellite.
a look at the Internet's distance running message boards reveals that thousands of marathoners are now incorporating the use of personal global positioning system (GPS) devices into their training and racing.
The RL features hands-free wireless telephone interface capability and Bluetooth connectivity, GPS navigation with voice recognition and real-time traffic and weather data via satellite, plus multiple power ports.
M2 EQUITYBITES-September 4, 2019-Aerojet Rocketdyne to advance GPS satellite constellation modernization
Travel Business Review-September 4, 2019-Aerojet Rocketdyne to advance GPS satellite constellation modernization