Paul,
On 11/09/2015 01:07 AM, paul swed wrote:
Because the roll over is a pain.
Thats good engineering if they checked that far.
What happens if you have a receiver that doesn't handle it correctly is you
do not tend to get satellite lock because the dates all wrong.
No. The GPS internal date-format avoids this issue altogether, it's the
conversion from the GPS date gears to "user dates" that gets confused
due to lack of additional bits for GPS weeks, but the GPS receiver can
keep operate even if the GPS weeks wrap, with very little software
concern. So, after the GPS week wrapping, wherever it occurs for a
receiver, only means that the published user date becomes wrong, not the
GPS system internal date, the receiver keeps working through it,
whatever it is.
You cheat this "The pain part" by figuring out what the date should have
been by subtracting 1024 weeks. Seems easy right. Nope.
I've only seen receivers fail in their date conversion, and in exactly
1024 weeks.
Cheers,
Magnus
That works for the old austron. But as I say serious thinking. There are
some online tools that help. But it all gets old very fast.
Regards
Paul
WB8TSL
On Sun, Nov 8, 2015 at 4:01 PM, Rob Sherwood. <r...@nc0b.com> wrote:
Why is this an issue?
Sent from my iPad
On Nov 8, 2015, at 1:00 PM, "Brendan Giles" <brendan_gi...@hotmail.com>
wrote:
I was the project manager who was in charge of the NAVSTAR proteus GPS
time and frequency unit.The two GPS rollover dates 1999/2018 were tested in
product test plan. Also various dates were checked upto 2037 for the PC
output message.
Brendan Giles
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