The 24 satellites in the Global Positioning System ( GPS ) are synchronous satellites, and they appear to be stationary to an observer on the earth.
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- GPS satellites send signal information, such as time, position of satellite, position of receiver, and traffic condition on the earth.
- Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use median Earth orbit satellites, BeiDou-1 uses satellites in （ ）. A: Geostationary orbit B: Circular orbit C: Sun-synchronous orbit D: Near polar orbit
- Geostationary satellites are the man-made satellites which . A: are always fixed in the regular position B: sometimes move with the earth C: are synchronizing with the movement of the earth D: can not fly off from the ground
- It is possible to use satellites to predict earthquakes because satellites ________. A: take pictures of the Earth B: catch radio waves sent from the Earth’s surface C: are sensitive to Earth’s movements D: see almost the entire Earth
- GPS(Global Positioning System) 是美国发展的全球卫星定位系统。GPS 定位的基本原理是______
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What is China's independant research and development satellites navigation system A: GPS B: BDS C: GNSS D: GSNS
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The photos of Mars taken by satellites are (clear) ______ man those taken from Earth.
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GPS是英文全球定位系统Global Positioning System的简写,开发的国家是
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The space segment of GPS consists nominally of 24 satellites operating in six orbital planes spaced at 60° intervals around the equator. （ ）
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15( )is a satellite-aided SAR system based on low-a3titude near-polar-orbiting satellites and designed to locate distress beacons transmitting on the frequencies 121.5 MHz and 406 MHz. A: GPS B: GLONASS~ C: Inmarsat system D: Cospas-Sarsat system