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Re: differential GPS
By:mike
Date: 5/4/2000, 1:25 pm
In Response To: Re: differential GPS (Dale Frolander)

Actually, the one mm or 0.1mm is dependant on knowing the position of at least one other point. DGPS uses a precisely located beacon to calculate the induced error (SA) and broadcast a correction factor. That gets you the 5 meters. The surveyor accuracy comes from taking a long series of fixes and averaging the position which can result in exceptionally high accuracies given enough time.

There are also some advanced algorithms which might result in higher accuracies using other parts of the signal information, but none of these are commercially available.

On the reality check side, 5 meters is exceptional for position data (considering state of the art 5 years ago) and I expect less than one meter would be too sensitive for marine applications.

Messages In This Thread

GPS users
Kent LeBoutillier -- 5/3/2000, 6:15 am
Re: GPS users
Totto -- 5/3/2000, 3:42 pm
Re: GPS users
Charles Cooper -- 5/3/2000, 4:11 pm
differential GPS
Bruce -- 5/3/2000, 7:55 pm
Re: differential GPS
Dale Frolander -- 5/4/2000, 12:04 am
Re: differential GPS
Dale Frolander -- 5/4/2000, 9:39 pm
Re: differential GPS
Mitch Isoe -- 5/12/2000, 1:49 pm
Re: differential GPS
mike -- 5/4/2000, 1:25 pm
One millimeter?
Bruce -- 5/4/2000, 9:33 am
Re: One millimeter?
Tig and Tink -- 5/7/2000, 7:59 pm
Re: One millimeter?
Paul G. Jacobson -- 5/4/2000, 4:51 pm
Re: One millimeter?
Shawn B -- 5/4/2000, 11:05 am
Re: differential GPS
Kent LeBoutillier -- 5/4/2000, 5:59 am
Re: differential GPS
Paul G. Jacobson -- 5/3/2000, 10:09 pm
Re: differential GPS-use UTM
Doug -- 5/4/2000, 12:03 pm
Re: differential GPS-use UTM
Tim Smith -- 5/4/2000, 1:08 pm
Re: differential GPS-use UTM
Doug -- 5/4/2000, 3:09 pm
Re: Good info on GPS
Mitch Isoe -- 5/4/2000, 3:42 pm
OOPS!
Tim Smith -- 5/4/2000, 1:51 pm
Re: differential GPS
Pete Roszyk -- 5/4/2000, 9:26 am
Re: GPS users
Totto -- 5/3/2000, 4:34 pm
Re: GPS users
Hank -- 5/3/2000, 12:25 pm
Re: GPS users
Bill, near Maryland -- 5/3/2000, 4:10 pm
Re: GPS users
Tim Smith -- 5/3/2000, 10:12 am