Re: F-22 Raptor software problem

["Bob Spooner" <rls19@psu.edu>]

"Aurele" <aurele.vitali@gmail.com> wrote in message 
news:1172635528.435013.151190@m58g2000cwm.googlegroups.com...
> On Feb 27, 9:33 am, "Bob Spooner" <r...@psu.edu> wrote:
>> "Aurele" <aurele.vit...@gmail.com> wrote in message
>>
>> news:1172502110.098416.297700@q2g2000cwa.googlegroups.com...> On Feb 26, 
>> 3:55 am, "Alex R. Mosteo" <devn...@mailinator.com> wrote:
>>
>> > Well, someone is likely to lose their job for improperly implementing
>> > the geoid and/or datum model!
>>
>> I would be inclined to think that the (derived) requirements were
>> incompletely specified and therefore didn't cover the case of what 
>> happens
>> when the nav system, while using GPS signals for time, crosses the date 
>> line
>> (or something like that.)  -- Bob
>
> I'm sure its not a drived requirement. The international date line has
> been there forever! Also, time is always measured wrt Greenwich time
> in England. So, not a big deal. As Simon above said, it is probably
> just a test case that fell through the cracks!  Go to
> http://wwp.greenwichmeantime.com/info/timezone.htm for more info on
> Time Zones.
>
> p.s. "or something like that" has very little meaning! :-)
>
Well, the reason I think that it is a derived requirement is because if it 
were explicit in the contract, there would have to be traceability to both 
the code implementation and to the test that verified that it was 
implemented correctly.  Bob