Working principle of the dgps

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differntial gps
it is fixed station whose position is known
it recives its position from the satellite and calculates the error between two positions and  then it transmits the error for that satellite

brendon n kamlesh

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it has a fix position and it compared with 3 satellite position and compare with own position and diffrence will be find out,and transtmit the difference in all vessels are uhf range