Keith Packard <[email protected]> writes: > Take a look at the 'table' view in AltosUI -- that'll give details on > precisely which sats you're seeing and what kind of C/N0 numbers they're > showing.
I test the GPS functionality on every board we sell, so I've watched the acquisition and lock process progress probably more than any other person on our products. Every once in a great while, I see a GPS chip that kind of gets "stuck". If you haven't achieved lock within a half hour or so, I'd definitely suggest disconnecting the battery for a couple minutes and then trying again. Even if you power-cycle the board, if the battery is connected the GPS chip's ephemeris information is retained. Disconnecting the battery forces a true "cold start" to occur. I live in the woods, and the weather doesn't always support going outside to test things. As a result, attaining lock with any GPS receiver can be "interesting" at times. But, my experience has been that if I have at least one satellite with a C/N0 number above 35, the board is fine and will lock ok at a launch site where you tend to have a nearly hemispherical clear view of the sky. Bdale
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