1, the atmosphere: the electronic properties of the ionosphere are unstable, which will have a great impact on wireless signals. The troposphere is filled with water vapor, which affects the speed
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1, the atmosphere: the electronic properties of the ionosphere are unstable, which will have a great impact on wireless signals. The troposphere is filled with water vapor, which affects the speed of radio transmission.
2, multi-channel interference: the impact of GPS signals on obstacles near the receiver many times, such as nearby tall buildings, mountains, etc., sometimes the signal is even completely blocked.
3, the current number of visible GPS satellites: From the beginning, it is known that to accurately locate must receive 4 satellites, visible GPS satellite number is also an important factor.
4, visible GPS satellite distribution: if the Angle formed between the captured several satellites is large, the received effect is better, otherwise the effect is poor.
5. Satellite clock and orbit difference:
6, affected by the environment: such as indoor, underground, water and other places.
7. Human interference: In order to meet the needs of international security interests, the United States began to implement the so-called SA policy in 1992, which artificially restricted and interfered with the accuracy of positioning.
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