rate of about tens of meters so, in the current commercial applications, has been to meet the most needs.
In addition, synchronized with the GPS ground station to receive satellite signals differential positioning (Differential GPS, DGPS) technology to the GPS receiver after reception repeatedly recognized by this action to eliminate the satellite signal error and interference, through the differential positioning technology, the margin of error can be reduced to 2-5 meters, has been able to use the car at the precise navigation and positioning system.
GPS error causes
From the GPS can be learned form the basis of the principle of GPS is not difficult, basically GPS satellite signals will continue to orbit transfer information contained in the atomic clock will not stop their produce accurate time information. GPS receiver and each has its own clock and radio receivers, so the latest information is continuously received. At the same time as each satellite will have a different ball signal, so often a continuous three satellite signal is received, there will be a point of intersection, namely the GPS positioning function.
But even if the signal will be accurate, GPS will continue to disturbances due to various natural or errors, the errors caused by GPS satellite signals for many reasons, from the nature of the physical factors, to the distance between the satellites caused by interference and the number of devices connected internal error may have resulted in GPS signal errors generated, this point will seriously affect the performance of GPS products. |
Last data update: 10.12.2011