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Theory and Features of GPS


The basic principle of GPS positioning is based on instantaneous position with high-speed movement of satellite known as the initial data.The use of space from the resection method to determine the location of the point under test. As shown, assuming that at time t placed the GPS receiver on test points on the ground. We can determine the time △ t when GPS signals reach the receiver(terminal), with the received satellites and other data to determine the following four formulas.


(1)could be used worldwide , wholeday standby.
①Accurate position.Positioning accuracy is less than 10m, positioning accuracy could be devided to centimeter and millimeter units.
② multi-function, wide application.
GPS system features: high precision, all-weather, high efficiency, versatility, easy operation, widely used and so on.

1, high positioning accuracy

Application in practice has proved, GPS relative positioning accuracy could reach 10-6m within 50KM, 10-7m within 100-500 KM, 10-9m within 1000KM. In the precision positioning in engineering within 300-1500M, plane position error is less than 1mm for observation more than 1 hour, compare with the ME-5000 electromagnetic rangefinder measurement, the largest gap of its poor side length is 0.5mm, the deviation is 0.3mm.  

2, the observation time is short

With the constant improvement of the GPS system, constantly updated of the software. At present, only 15-20 minutes , you may get a relatively static position within 20KM .When the distance of each mobile station and base station within 15KM. Just needs 1-2 minute observed time of the mobile stations for fast static relative positioning measurements. Then locate at any time,as each observation station takes a few seconds.