jtd wrote:
On Thursday 31 August 2006 10:52 am, hemendra jain wrote:
Dear Rony,
Sorry to interrupt but..
No way man, your opinion is most valuable. I like the way you foresee things.
The person has to know his distance and bearing relative to the radio beacons. This information has to be computed by the reciever and requires expensive electronics - gps without weak signal rf frontend
- the transmitter cannot provide this info. since the beacons will
have to be omnidirectional he is going to pick up reflected signals killing any chance of getting useful postioning info.
You are right on that. Later, I was wondering too how an omni-directional transmitter can give directions to people standing on different roads, so one man's left will be another's right and so on. This could be resolved through some method of seeking the user's position first and then tx will reply accordingly. The pole that picks up the strongest signal guesses the user location nearby and internally sends this info to other poles. The poles could use 4 directional receivers to guess user location with better accuracy.
But it can definetly provide useful info about the locality and should be useful for just that. For a visually handicapped person even a gps wont work
- error of 15 mtrs is common - he will be in extreme danger trying to
use these as guidance system or even as a navigational aid.
Very true and any guidance system will be incomplete without guide railings along footpaths and other paths that the user feels his way through. The railings can be embossed with data in braille so as the user slides his hand over it, he reads instructions printed on it. This will be very useful for railway foot overbridges too to know which platform to get down to.
Regarding shops using it as a medium radio clutter will kill any cahnce of finding use ful info.
Agreed.
Regards,
Rony.
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