[time-nuts] WAAS.....

[Bob Camp]

The ionospheric data provided by the WAAS sat’s is somewhat limited. The longer the path, the worse the performance. That’s one of the many reasons you get better survey information from post processed data. 

On Jan 8, 2014, at 3:25 AM, Brian, WA1ZMS <wa1zms at att.net> wrote:

> In this case the timing rcvrs are located all with in a 20km radius with fixed known surveyed locations. The problem is GPS jamming that happens at random times. So one "what if" idea is to use a WAAS enabled rcvr and a yet to be selected parabolic antenna to point at a given WAAS sat. The concept is to give all rcvrs a single common view for critcal timing use in a comm system.
> 
> The ultimate goal is to try and reduce the number of times when full sky view GPS antennas are victims of GPS band interference.  This is only a half-baked idea of mine (in my day-job) but wanted Time Nuts feedback to see if it has any merit at all. BTW, the system has Rb for hold-over when there are problems but the frequent system error alarms indicating hold-over events is what I/we would like to reduce. New SNMP traps could mask off the events, but being an RF guy.....I was thinking about a HW solution. :- )
> 
> 
> -Brian, WA1ZMS/4
> iPhone
> 
> On Jan 7, 2014, at 11:05 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> 
>> Brian,
>> 
>> On 2014-01-08 02:25, Brian, WA1ZMS wrote:
>>> Hypothetical question....
>>> For a given set of GPS timing grade receivers at multiple locations, is there any advantage by limiting allowable SVN numbers to only be the WAAS satellites?
>> 
>> Well, if you do common view GPS comparision and is not into monitoring observables separately (which is recommended), then there is some use for it, as you configure the WAAS acceptance statically and only need to update it once a new bird becomes available or one disappears. However, I wonder if they are any good for that purpose anyway.
>> 
>> So, in a more general way, I'd say no.
>> 
>> More importantly, what are you trying to achieve?
>> 
>> Cheers,
>> Magnus
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