[time-nuts] To use or not to use transmission line, splitters for GPS receivers

brooke at pacific.net brooke at pacific.net
Wed Oct 10 11:10:18 EDT 2012


Hi:

The reason for the GPS orbits is so that the ground track repeats.

Have Fun,

Brooke

>
> On 10/10/2012 8:00 AM, time-nuts-request at febo.com wrote:
>>> albertson.chris at gmail.com  said:
>>>> >>The satellites are in 12 hour orbits.  Everything repeats every 12
>>>> hours.
>>>> >>But the sun is on a 24 hr. period and if you did two 12 hour tests
>>>> you don't
>>>> >>want to do one at night and one in day.   So start each test at the
>>>> same
>>>> >>time of day let it run for 12+ hours.
>>> >
>>> >Thanks.
>>> >
>>> >After poking around a bit...
>>> >
>>> >That's 12 Sidereal hours rather than 12 UTC hours.
>> Rarther, it's 11 hours and 58 minutes UTC.
>>
>> It revolves about 2x366.35 times the globe over a year. I don't remember
>> why they choose such an orbit, but it has its uses.
>>
>> Cheers,
>> Magnus
>
> Isn't that half of a sidereal day? A sidereal day being ~4 minutes
> shorter than UTC day...
>
>
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