The GPS positioning is to use the observation of the pseudo -distance, the star calendar, the satellite launch time of a satellite, and the time of observation time. At the same time, it must be k
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The GPS positioning is to use the observation of the pseudo -distance, the star calendar, the satellite launch time of a satellite, and the time of observation time. At the same time, it must be known that the user's clock is poor. Therefore, in general, if you want to know the height of the latitude and longitude, then you must receive 4 satellites to accurately locate.
There are three parts of GPS: three parts:
The first part is all available in all GPS receivers, such as satellite clock errors, star calendar errors, ionization layer errors, pairing errors, etc.;
The second part is the delay error of the communication;
The third part is the inherent error of all GPS receivers, such as channel delay, multi -diameter effect, internal noise, etc.;
The first part of the error can be completely eliminated by differential technology;
Most of the error in the second part can also be eliminated, mainly depending on the distance between the benchmark receiver and the user receiver.
The third part cannot be eliminated, the specific reason
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