[time-nuts] multipath on GPS

Bob Camp kb8tq at n1k.org
Sat Aug 9 11:21:21 EDT 2014


Hi

…. back to “that depends”….

When you have a sat at just the right point *and* you are tracking that sat *and* it’s a significant part of your solution - you get a multi path issue. Then the question becomes how good your particular receiver is at rejecting multi path. 

You can indeed do a pretty good job reflecting GPS with a 1 meter square sheet. I ran the experiment with a 1/6 size sheet and 6X the frequency. You can get a good signal with the right geometry. No I don’t have any exact data. I ran it back in microwave lab back in school … hopefully the physics of microwave reflection hasn’t changed much in 40+ years.

Bob

On Aug 9, 2014, at 10:44 AM, Chris Albertson <albertson.chris at gmail.com> wrote:

> On Fri, Aug 8, 2014 at 2:52 PM, Azelio Boriani <azelio.boriani at screen.it> wrote:
>> What about using cables to simulate the reflector? Connecting the
>> antenna to the receiver using a splitter, two very different length
>> cables and then a combiner at the receiver's input.
> 
> That is a very unrealistic test.  True reflections would come from
> only those satellites that were in the correct geometry and the path
> length would be different for each of them and this all would change
> over time.
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
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