[amsat-bb] Doppler Tracking Discontinuity at TCA - Problem Solved

[Bruce Perens]

The ITAR limits on GPS altitude and speed were rescinded in 2014, which
doesn't mean every manufacturer has removed them. But they were not
arbitrary, they were government-imposed. It just happened that some
manufacturers implemented them as limits on both being over 60,000 feet and
1000 miles per hour at the same time, others on exceeding either the speed
or the altitude.

It's perfectly fine to have a check box that says "the station will not be
on the surface of the Earth", if your program is actually capable of that
sort of  operation (I doubt this one really is), but in general it is good
practice to protect the user from foolish inputs unless they check that
kind of box.


On Sat, Aug 29, 2020, 3:37 PM Phil Karn via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> On 8/29/20 10:52, Bruce Perens via AMSAT-BB wrote:
> > It's a software bug when the software quietly accepts an impossible
> > parameter.
> >
> It's not an impossible value. Balloons can reach 35 km without too much
> trouble. I don't like software with arbitrary limits imposed by authors
> who lack the imagination as to how people might use it. Ballooners
> already have enough problems with arbitrary altitude limits in GPS
> receivers.
>
> Phil
>
>
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