Thought of or tried ground plane antennas like Trimble choke ring, Zephyr
or similar to attenuate below horizon interference?
On 2014-01-08 01:25, Brian, WA1ZMS 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 <mag...@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?
--
Take care. Thanks, Brian Inglis
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