Google Answers: Differential GPS

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Q: Differential GPS ( No Answer, 0 Comments )

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Subject: Differential GPS
Category: Science > Technology
Asked by: johann-ga
List Price: $3.00

Posted: 08 May 2003 14:59 PDT
Expires: 07 Jun 2003 14:59 PDT
Question ID: 201342

1.- Why would Differential GPS, a method used to greatly enhance the
accuracy of  gps measurements, ever require satellites to be blocked
from view?
2.- Carrier Phase GPS requires that the system has "locked on" to 4 or
more satellites. The longer this lock exists, the greater the accuracy
of the locations. Why a longer baseline between the base and rover
station results in greater accuracy?

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