Re: Celestron SkyScout's a winner
- From: Sam Wormley <swormley1@xxxxxxxxx>
- Date: Sun, 13 Aug 2006 23:49:25 GMT
Chris L Peterson wrote:
On 13 Aug 2006 15:55:37 GMT, Pierre Vandevennne
<pierre@xxxxxxxxxxxxxxxxx> wrote:
As far as altitude goes, doesn't the sky sensor rely on GPS + WAAS only? I've found this to be extremely accurate 2-3 in both the vertical and horizontal plane on my "trekking" GPS. One doesn't need more than something like a SQ-SI2X-360DA, a GPS chipset and of course some code to implement the skyscout functionality imho.
How do you figure? Altitude (i.e., height above sea level) is of no use
at all. The unit needs a 2D topocentric location (latitude and
longitude), but hardly to WAAS accuracy, and it needs two dimensions of
attitude: altitude (degrees above the horizon) and azimuth (compass
angle). Neither of the latter two are available from the GPS.
At least not without multiple antennae. There is equipment (military)
which achieves a fraction of a degree pointing (or orientation) accuracy
http://trimble.resultspage.com/search?p=Q&ts=custom&w=Tans%20vector
which, of course, is overkill. As you point out--compass and inclinometer
are sufficiently accurate to determine attitude.
-Sam
.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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- Celestron SkyScout's a winner
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- Re: Celestron SkyScout's a winner
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