Re: INDOOR Positioning: New Solutions for Challenging Applications

From: Hans-Georg Michna (hans-georgNoEmailPlease_at_michna.com)
Date: 08/04/04 

Date: Wed, 04 Aug 2004 20:22:12 +0200

On Wed, 04 Aug 2004 09:46:18 -0700, Dale DePriest
<Dale@gpsinformation.het> wrote:

>Try
>http://www.rosum.com/rosum_tv-gps_indoor_location_technology.html
>
>The basics are that a TV antenna is at a fixed location, The TV signal
>contains a timestamp which can be used in the same way as a time stamp
>in GPS. Thus 3 stations can results in a 2D fix in the same way that it
>is done in a GPS system by getting pseudo ranges and then correcting.
>You cannot get a 3D fix. Augmentation can be provided by another source
>that provides clock correction data for the individual TV stations. It
>doesn't work very well if all the stations in your area pick the same
>hill for the transmitter towers.

Dale,

you didn't get the core of my idea. They need to modify the TV
transmitters to send predefined time signals. My invention
doesn't even touch the TV transmitters. It uses their unmodified
signals.

Hans-Georg 

-- 
No mail, please.

Relevant Pages

  • Re: Indoor Antennas. Do They Work?
    ... Analog problems with reception might a clue that you'll have problems with digital signals also. ... I am very close to all my target transmitters, but down in a valley with tall pine trees all around. ... No indoor antenna I tried came close to producing a usable signal, and I wound up having to mount a regular outdoor Radio Shack antenna in my attic. ... I does a great job on pulling all the stations in. ...
    (alt.tv.tech.hdtv)
  • Re: BAd News!
    ... Digital | signals do not degrade as gracefully as | analog. ... What happens is that small | portions of the picture turn into relatively big blurry blocks. ... The money broadcasters pay for upgrading and for their electric broadcast bill are the "dues they must pay for must carry" as one major broadcaster told me. ... Though publicly broadcasters will say they treasure their OTA viewers many would turn off their transmitters in a second to save money if they thought they could maintain must carry rights. ...
    (alt.tv.tech.hdtv)
  • Re: Eavesdropping on Radio Broadcasts from Galactic Civilizations with Upcoming Observatories for Re
    ... RD> How can they conclude that with a system like MWA and SKA that we ... transmitters of power comparable to what we emit. ... RD> 'gain', and this will seriously reduce its sensitivity. ... This seems reasonable for detecting broadcast signals or other long-duration ...
    (sci.astro.seti)
  • Re: Transmitter issue
    ... If I understand correctly you want to lose two transmitters and just use the sgnal from one at three different places? ... Maybe one transmitter is used for pressure control and the other two are just for indicating displays somewhere. ... If the input resistance is low enough on the receiving units it's possible that the power supply that's powering the loop has enough balls to drive two additional units. ... What are the three signals used for? ...
    (sci.engr.control)
  • Re: How Does Light "Know" How Fast to Travel? (SPAM)
    ... On the rocket ship and on Mars are two radio transmitters arranged so ... >the signals pass each station simultaneously, ... >The velocity of a wave propagating through a medium is the velocity of ... >propagation of that wave though the medium. ...
    (sci.physics.relativity)