I have a colleague who's using the Systron-Donner MMQ IMU/GPS unit, and
he's wondering if there's a way to get "integer seconds" out of it. It
uses a Jupiter Pico GPS, I believe, and one of the messages provides
Seconds of Week GPS time, as well as UTC seconds and UTC day, month, year.
So here's the question.. he needs "seconds from epoch" (like TAI time),
and it's moderately straightforward to convert D/M/Y to get midnight
time from epoch and then add the seconds.
The question comes up of whether there's a clever fast algorithm (in C)
to get "Week time" so he can add GPS seconds of week to midnight of week
start.
Or alternately, does anyone know what the leap second behavior of this
unit is, and he can just use the UTC.
And in fact, as I sit here before my morning coffee, this brings up an
interesting leap second question: if you did a "calculate midnight time
in seconds and add seconds of day (or week)", what do you do for that
calculation..
Is the midnight time for the midnight after the leap 86401 greater than
the midnight time before leap? That makes calculating seconds of
midnight a bit tricky, because it's not just "year epoch + month epoch +
day of month*86400"
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