[time-nuts] Terrestrial GPS

[Bob kb8tq]

Hi

But, by their nature, not useful for timing or precision navigation. They are simply
a solution to the “feed you coupons at the mall” issue. Since they run as an independent 
system (they have their own ID’s) the direct “pollution” issue on a GPSDO is eliminated. 
You still have the previously mentioned receiver dynamic range questions.

Bob

> On Mar 15, 2018, at 5:26 AM, Leo Bodnar <leo at leobodnar.com> wrote:
> 
> Such system already exists, is called IMES, uses L1 band and is supported by standard Ublox 8 firmware.
> 
> http://gpsworld.com/wirelessindoor-positioningopening-up-indoors-11603/
> 
> Leo
> 
> 
>> From: Stewart Cobb <stewart.cobb at gmail.com>
>> Peter Reilley suggests a backup to GPS using terrestrial transmitters. This
>> idea has been around since the early days of GPS....
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