Chuck H:
I guess I should know a little about receivers as I wrestle with them almost every day.
Jaycee:
As I've said before on the German stuff, I just have good sources, one being this board and I try to look at a lot of examples.
But back to the GPS on the topic of knowns and unknows, you need good data from a separate satellite for each unknown: Long., Latitude and height. Actually height is a demon all by itself that requires a specific constellation configuration for good values. We're spinning say at 1000 miles per hour and it's a complex, dynamic quantum system that looks as if it would never work. At any rate, due to the wavelength of light being near the nanometer range, there's a clock error, which of course is time dependent. So you need good data from 4 birds to get X, Y and Z. If you just have 4 you probably will be getting poor data from one. So more than 4 sources is always better and there are precise orbits which will predict the max number of birds for a given time. Actually in some cases, like on a body of water, X,Y position can be obtained from 3 satellites. Has anyone purchased or used the Rhinos(or seen the advertisment)?
Kind Regards,
Raimey
rse
Last edited by ellenbr; 01/01/09 09:24 PM.
