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  Tutorial: Factors responsible for GPS signal errors

The GPS receiver requires the current time, the orbital position of the satellite and a measurement of signal delay. Calculating accurate co-ordinates of an object primarily depends on three data.

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The GPS receiver requires the current time, the orbital position of the satellite and a measurement of signal delay. Calculating accurate co-ordinates of an object primarily depends on three data. To measure the signal delay, the receiver prepares an identical sequence of the Coarse-acquisition (C/A) code and compares it with the sequence received from the satellite. The changes in bit transition can be calculated an approx. of 10 nanoseconds for the code. As the signal travels at a speed equal to the light, the net error can be taken as 3 meters.


 

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