Re: GPS idea
- From: "The Sorcerer" <Headmaster@xxxxxxxxxxxxxxxx>
- Date: Thu, 08 Jun 2006 07:53:46 GMT
"Abstract Dissonance" <Abstract.Dissonance@xxxxxxxxxxx> wrote in message
news:128fk89k6sip923@xxxxxxxxxxxxxxxxxxxxx
|I was reading some stuff today about GPS and had a few ideas. I'm curious
as
| to if anyone things they have any practicality. I am by no means an expert
| on GPS and basically this is my first time even reading about some of the
| specs and stuff. I did take several courses in physics several years ago
by
| I have forgotten most, if not all of what I have learned. These are just
| ideas and I am not saying they will work or even make sense... just trying
| to get some feed back. (note, everyone is non-relativistic for simplicity)
|
|
| I was thinking that one could attach to each satellites two frequencies to
| transmit on. This might help in solving the problem of the speed of light
| changing due to the different mediums that it transmits through.
|
| The data that the satellite transmits would include the distance from
itself
| to all other satellites and to a reference on the ground.
|
| The idea for the different frequencies is to somehow build up a
differential
| method of dealing with the change in the speed of light as it passes from
| the transmitter to the receiver. I'm not sure if it will work but I was
| thinking that, say, if satellite A transmits the signal on frequency X and
| frequency Y that one might be able to remove the changes in the speed of
| light through the different mediums because it will effect both signals
the
| same amount. Not sure if this would lead to something worthwhile though.
| Basically it would seem that one could compute the dispersion due to the
| medium between the transmiter and receiver to "repair" the distance
| computed. Maybe there are other ways to do this too by using only one
| signal and by using some modulation method.
|
|
|
| By including the distances(and maybe positions too) from all the
satellites
| from each other, which are able to computed in a vacuum(I think, not sure
if
| it will go through the ionosphere but maybe the method above could work
| too). This might not be practical as the satellites would have to send
| signals to each other too and some power would be wasted.
|
| It would seem that by knowing the complete geometry of all the satellites
| one could use that information to compute a more accurate location of the
| GPS receiver. Basically all the information to find the location on earth
| would be sent by just one signal. Since the receiver would be getting
| atleast three signals(or six) and a series of data that should be
identical
| except for the computed distances to the reciever from each of the 3
| satellites, it could compute errors in the distances and possibly use
| statistics to increase the accuracy of the data. One could also calcuate
| angles for whatever reason too. By having ground facillaties included,
which
| would essentially be "fixed" satellites, would could tie everything
| together. i.e., angles could be computed from a reference point, say the
| north and south poles. One could possibly, say, know how far they are from
| the polar axis and such... which at this point I think at this point one
has
| to reply on "maps" to figure things like that out.
|
| Not sure if that makes sense or would work but just an idea.
|
| Thanks,
| Jon
http://en.wikipedia.org/wiki/Diminishing_returns
I don't really care if I'm parked 0.5435 inches or 13.6324 feet from the
kerb,
I'll only use GPS to find the road I want, and anyway somebody already
parked in my spot. So even if it works, it's a wasted effort.
Androcles
.
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