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Questions about the GPS drift and opinions
 
Release Time:  2014/1/17 copyright belongs:  LEGEVO TECHNOLOGY Focus number: [ 4509]
 

Play GPS also some years, often see a friend about the drift problem, talk about some of his own views, the level is limited, inadequate please.

1, the principle of GPS positioning

To figure out this problem, first of all from the GPS positioning principle about, from the mathematical view, space is known to the three points, and you to the relative distance of these three points, for your position, this is a very simple question of solid geometry, GPS mathematical principle.

Corresponding to the actual application, the three known position, three satellites isheaven, because the satellite is in accordance with the "precise ephemeris" running,so it in a time where we can know, it satisfies the first condition in solving mathematical principles; the second condition is need to know your relative distance the three satellites, satellite radio signal specific GPS receiver, after you received this signal to match the time difference, because radio propagation velocity is known, so by the time difference can be calculated with respect to the satellite distance you. Two conditions are met, your position will come out. The above is just for a simple description of the GPS principle, practical application but also much more complicated, to achieve 3Dpositioning in fact, needs at least 4 satellites, more than one is used for timing.Interested friends can access relevant information to satisfy your curiosity.

Reason 2, drift

See GPS positioning principle, we will find that, although the principle is very simple,but to achieve the two known conditions through physical means, is very complex.First of all, satellites flying in the sky, there is no guarantee that it will not a bit of difference in its own orbit, there are always more or less deviation. Secondly, GPS receiver, you also may not a cesium atomic clock, radio wave propagation velocity is about 300000 kilometers per second, a simple calculation and you will find, if the timeerror of 0.00001 seconds, the distance difference how much? Even if your time there will be no error, radio wave propagation in the air will be affected by many factors,such as weather. These effects are not the main influence, more important reason isthat you can receive much of the satellite signal. GPS signal is very weak, the receiverthen a ceramic antenna, you expect to have what good effect? So basically what stopwords, you will not receive the signal, even if you received a ten eight strong signal of satellite, it will be very accurate? No, if you happen to catch the ten satellites are tied into a meeting, or arranged in a neat team came home from school, you miserable.

Is it right

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The article source: 华思众科技
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