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Posted by miso on December 13, 2011, 4:40 pm
> http://www.supercircuits.com/GPS-Tracking-Devices/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.

Posted by Wolfgang S. Rupprecht on December 14, 2011, 5:10 pm

>> http://www.supercircuits.com/GPS-Tracking-Devices/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

Posted by miso on December 15, 2011, 12:08 am
On 12/14/2011 2:10 PM, Wolfgang S. Rupprecht wrote:
>>> http://www.supercircuits.com/GPS-Tracking-Devices/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.

Posted by Alan Browne on December 15, 2011, 11:31 am
On 2011-12-15 00:08 , miso wrote:
> On 12/14/2011 2:10 PM, Wolfgang S. Rupprecht wrote:
>>>> http://www.supercircuits.com/GPS-Tracking-Devices/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.

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