measuring 10 km with 1m accuracy
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From: Surinder Singh on 15 Feb 2010 07:13 Hi, What would be best technology (GPS,IR,Radio/freq,ultrasonic etc) for doing distance measurements upto 10km with accuracy of 1 meter? GPS could be good for greater distance but accuracy seems coarse. - Surinder
From: Rich Webb on 15 Feb 2010 07:46 On Mon, 15 Feb 2010 04:13:09 -0800 (PST), Surinder Singh <gogreenmiles(a)gmail.com> wrote: >Hi, > >What would be best technology (GPS,IR,Radio/freq,ultrasonic etc) for >doing distance measurements upto 10km with accuracy of 1 meter? There are survey grade GPS units with centimeter accuracy. And, of course, there is also the traditional method using theodolites. It all depends on how you define "best." -- Rich Webb Norfolk, VA
From: Tauno Voipio on 15 Feb 2010 07:48 Surinder Singh wrote: > Hi, > > What would be best technology (GPS,IR,Radio/freq,ultrasonic etc) for > doing distance measurements upto 10km with accuracy of 1 meter? > > GPS could be good for greater distance but accuracy seems coarse. > > - Surinder If you are not in a hurry, GPS using the geodetic methods will give accuracies well under a meter with static relative measurement. The needed measurement time will be about an hour, simultaneously at both ends of the measurement distance. With top-end geodetic receivers and sufficient measurement time, an accuracy of a centimeter or less is attainable. The position is the phase centerpoint of the antenna. -- Tauno Voipio tauno voipio (at) iki fi
From: Vladimir Vassilevsky on 15 Feb 2010 10:19 Surinder Singh wrote: > Hi, > > What would be best technology (GPS,IR,Radio/freq,ultrasonic etc) for > doing distance measurements upto 10km with accuracy of 1 meter? Measure 10km of what? The purpose of this measurement is what? > GPS could be good for greater distance but accuracy seems coarse. Use a long enough measuring tape. VLV
From: Vladimir Vassilevsky on 15 Feb 2010 10:29
Tauno Voipio wrote: > If you are not in a hurry, GPS using the geodetic methods will > give accuracies well under a meter with static relative measurement. > The needed measurement time will be about an hour, simultaneously > at both ends of the measurement distance. > > With top-end geodetic receivers and sufficient measurement time, > an accuracy of a centimeter or less is attainable. The position > is the phase centerpoint of the antenna. While ago I did a plot of a common GPS module readings taken at every second. The distribution was clearly not Gaussian; it was asymmetrical and skewed. I am not sure if it would be possible to improve the accuracy by averaging and how much of averaging it would take. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com |