> http://www.supercircuits.com/GPS-Tra...s/GPSTKM1-KIT2

"Includes a sensitive GPS receiver which makes use of RF reflections
common to the undercarriages and interiors of vehicles"

I just don't see the bottom of a car having surfaces reflecting upwards.

miso <(E-Mail Removed)> writes:
>> http://www.supercircuits.com/GPS-Tra...s/GPSTKM1-KIT2
>
> "Includes a sensitive GPS receiver which makes use of RF reflections
> common to the undercarriages and interiors of vehicles"
>
> I just don't see the bottom of a car having surfaces reflecting upwards.

The road reflects. Remember, any time the impedence of the medium
changes, you get some reflections.

-wolfgang
--
g+: https://plus.google.com/114566345864337108516/about

On 12/14/2011 2:10 PM, Wolfgang S. Rupprecht wrote:
>
> miso<(E-Mail Removed)> writes:
>>> http://www.supercircuits.com/GPS-Tra...s/GPSTKM1-KIT2
>>
>> "Includes a sensitive GPS receiver which makes use of RF reflections
>> common to the undercarriages and interiors of vehicles"
>>
>> I just don't see the bottom of a car having surfaces reflecting upwards.
>
> The road reflects. Remember, any time the impedence of the medium
> changes, you get some reflections.
>
> -wolfgang

Well yeah, but we're talking about some mighty weak signals.

On 2011-12-15 00:08 , miso wrote:
> On 12/14/2011 2:10 PM, Wolfgang S. Rupprecht wrote:
>>
>> miso<(E-Mail Removed)> writes:
>>>> http://www.supercircuits.com/GPS-Tra...s/GPSTKM1-KIT2
>>>
>>> "Includes a sensitive GPS receiver which makes use of RF reflections
>>> common to the undercarriages and interiors of vehicles"
>>>
>>> I just don't see the bottom of a car having surfaces reflecting upwards.
>>
>> The road reflects. Remember, any time the impedence of the medium
>> changes, you get some reflections.
>>
>> -wolfgang
>
> Well yeah, but we're talking about some mighty weak signals.

Receivers like the Sirf II are over-sensitive. This really shows under
canopy in the woods where it gives "valid" positions with huge random
walks (50 - 100 metres).

--
"I see!" said the blind man as he picked up his hammer and saw.