[ntp:questions] Start of new GPS 1024 week epoch
david-taylor at blueyonder.co.uk.invalid
Thu Aug 15 08:22:05 UTC 2013
On 15/08/2013 08:34, Rob wrote:
> David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>> On 14/08/2013 17:44, Rob wrote:
>>> How does a "good" receiver know the correct time? Does it rely on
>>> local (backed-up) storage, or is there some way of receiving it via
>>> the almanac? Or are "good" receivers hardwired as well, only with
>>> a different valid span?
>>> I would not be surprised when "good" receivers turn out to have just
>>> a different moment or mode of failure.
>> Some receivers have battery backup, in fact all but one of the receiver
>> types I use have this.
> Ok but what happens when the battery is replaced?
Hope and pray? Wish for a large capacitor or flash-rom?
I had thought that either ephemeris or almanac data might contain the
real UTC time, but apparently it does not. Obviously a system designed
too far in advance of the Year2000 fuss and bother!
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