On 16/08/2013 08:12, Magnus Danielson wrote:
[]
If you go here:
http://www.gps.gov/technical/icwg/
you will find IS-GPS-200G (which is the new name since 2006, I have
failed to adapt) on this link here:
http://www.gps.gov/technical/icwg/IS-GPS-200G.pdf
Using ICD-GPS-200D gives a fair idea of what the older GPS receivers was
designed to meet.
In these documents, the "gears" of GPS is explained such that you should
be able to implement a correctly working receiver (in principle). There
are a handful of technical details outside of this spec you need to
figure out too, but there are good books for that.
GPS continues to impress me - I counted and on holiday recently we
took (at least) 7 GPS receivers - his and hers smart-phones, 2 iPads,
Garmin GPS 60 CSx, Ventus 750, and one built into my Sony HX200V
camera! The Garmin spent much of its time with a puck antenna stuck
on the cabin porthole plotting our course.
They have gone small now, but you still have L1 C/A only receivers. Many
of them probably does not use carrier phase in any way.
Cheers,
Magnus
Yes, all my receivers are very simple, consumer-level ones. Sometimes I
see as low as 2m "location accuracy" on the GPS 60 CSx, more likely 3m
when walking.
Thanks for the pointers to the documents. A pity that they haven't been
able to find two or three spare bits to reduce the 1024 week ambiguity
to nearer a half-century or even 100 years. Oh, well!
--
Cheers,
David
Web: http://www.satsignal.eu
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