[time-nuts] Phase modulation detection/NIST plan

[Magnus Danielson]

On 07/14/2012 06:47 AM, Brooke Clarke wrote:
> Hi:
>
> The key thing GPS is lacking is Daylight Savings Time.
>
> WWV & WWVB have the DST bits that allow a clock to show the local time.

One reason GPS doesn't have it is that it is not coordinated globally. 
For instance, US is not shifting DST at the same time as Europe. There 
is no obvious "right" here.

Keeping track of the time-zones and their changes keeps the time-zone 
folks alert and requires a constant maintenance. Keeping it in the GPS
signal would require mapping of position to time-zone area, and only 
then it could be keyed down. These mappings does not stay stable, so any 
downlink format would need to describe them and would take considerable 
time. This is why it is best managed by the user himself.

Cheers,
Magnus