Tom,
Let's do a separate thread on that one.
Cheers,
Magnus
On 04/18/2013 08:07 PM, Tom Knox wrote:
I hope I am not steering the thread to much, I have an Allen Osborne TurboRogue
SMR12 RM L1 L2 GPS rec that came from JPL that appears specifically designed
for Common View use. Does anyone know the history of these ,I can find almost
nothing.
Email me directly if you have info, or I can start a new thread.
Tom Knox [email protected]
Date: Thu, 18 Apr 2013 19:58:22 +0200
From: [email protected]
To: [email protected]
Subject: Re: [time-nuts] antennas was Re: Common-View GPS Network
On 04/18/2013 04:00 PM, Jim Lux wrote:
On 4/18/13 12:01 AM, Chris Albertson wrote:
If I read the paper correctly you can skip the choke ring if you mount
the
antenna on top of a 2 meter or longer mast. Iron pipe comes on 10 foot
lengths. The choke ring is for portable survey antenna that can't be
placed on tall rooftop masts. I think a 2 meter pole on a roof pretty
much meets their criteria of multi path difference being over 10 meters.
yes.. multipath that is more than a chip away is generally filtered out
by the PN tracking loop, so all you really worry about is multipath
signals within a chip. For C/A code at 1 Mchip/sec, the chips are 300
meters long. If you're doing P/Y code, it's a tenth of that.
In reality, if the multipath signal is lower, and it's "far" away (a
good fraction of a chip) it doesn't contribute much to the output of the
correlator. So their 10 meter thing is probably a good number for a
"typical" receiver they make.
It's an interesting mix of sample-rate/bandwidth, code you track and
distance between early-late detectors (normal distance is one chip)
comes in when analyzing and combat the multi-path. I recall there is
some subtle points with some of the C/A codes.
Cheers,
Magnus
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