GPS accuracy

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GPSUSER234

Guest
Overall accuracy: http://www.gisdevelopment.net/technology/gps/techgp0036.htm
http://en.wikipedia.org/wiki/Geoid This will make Z value less accurate, because this model inside the gps, which is the 4th sphere, is figured out by engineers.
1/2 of our Earth will be added to the distance to the satellites low on the horizon. 109° is the best angle between satellites, because of a lesser distance to the gps, than in 90°. Z value will be 0 if the 3 satellites are close to the horizon and X and Y will not be very good because of a greater distance.
P.S. Batteries:
http://64.233.183.104/search?q=cache:x258XfPxkysJ:en.wikipedia.org/wiki/Battery_charger+types+of+battery+chargers&hl=is&ct=clnk&cd=1
http://216.239.59.104/search?q=cache:xyTjzZ9-rrgJ:peswiki.com/index.php/Directory:Batteries:Hybrio+rechargeable+batteries+hybrio&hl=is&ct=clnk&cd=2
 
G

GPSUSER234

Guest
Overall accuracy: http://www.gisdevelopment.net/technology/gps/techgp0036.htm
http://en.wikipedia.org/wiki/Geoid This will make Z value less accurate, because this model inside the gps, which is the 4th sphere, is figured out by engineers.
1/2 of our Earth will be added to the distance to the satellites low on the horizon. 109° is the best angle between satellites, because of a lesser distance to the gps, than in 90°. Z will be very inaccurate if the 3 satellites are close to the horizon and X and Y will not be very good because of a greater distance. On average Z accuracy is calculated as 50% of X and Y. Almanac data could maybe give priority to which satellites are used in the calculations?
P.S. Batteries:
http://64.233.183.104/search?q=cache:x258XfPxkysJ:en.wikipedia.org/wiki/Battery_charger+types+of+battery+chargers&hl=is&ct=clnk&cd=1
http://216.239.59.104/search?q=cache:xyTjzZ9-rrgJ:peswiki.com/index.php/Directory:Batteries:Hybrio+rechargeable+batteries+hybrio&hl=is&ct=clnk&cd=2[/QUOTE]
 
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