On Fri, 30 Sep 2011, mike cook wrote:
Le 30/09/2011 09:13, Keith Winstein a écrit :
DUT1 gets 31 bits, including the sign, and is in units of 2^(-24)
second. They also give a rate of change so it can be approximated to
first order by the receiver.
Have you got a reference for this Keith? The only info I could find is from
Page 18 sub-frame 4 where the GPS-UTC delta is defined maybe the doc was
incomplete . And as a bonus, do you know of any receivers which report it?
Hi Mike,
The 31-bit DUT1 is actually part of the new GPS CNAV navigation message on
L2. See IS-GPS-200E table 30-VIII. I'm not sure if they have actually
started transmitting it yet.
The traditional GPS navigation message also sends ephemeris parameters to
convert from ECI of the satellite ephemerides to ECEF, but I do not think
DUT1 can necessarily be derived from these, since each ephemeris seems to
be transmitted in a different ECI frame.
-Keith
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