Dual GPS receiver ?

GT65coupe · 10-13-2004, 10:58 PM

Hi guys,

Is it possible to use 2 GPS receivers at the same time?
for more accuracy?

Stephane

Quattro · 10-13-2004, 11:03 PM

I haven't seen it done before. But I can't see it making a difference. Wouldn't both the receivers be locked to the same sats? So what would be the point of haveing two.

GT65coupe · 10-13-2004, 11:05 PM

Quote: Originally Posted by Quattro-A4

So what would be the point of haveing two.

well i don't know, that's why i am asking

maybe to boost reception? I don't know

HybridFox · 10-13-2004, 11:10 PM

basicaly from what i here the triangulate your position to within about 5 meters of acuracy.
so it would be my guess that even if you did get it to work the best it would do is give you two positions 1-5 meters apart from each other so you could jus imagine yourself inbetween them
best i can do

Nav_Attack · 10-13-2004, 11:10 PM

that seems unlikely to help too much.. maybe if you wrote a program to average the position of the two, you'd get a slightly more accurate reading on where you are.. but i've found it to be fairly accurate for the most part.

for boosted reception, theres a thread floating around somewhere about putting a refridgerator magnet under the receiver for increased reception (aka faster locking)

blackpacu · 10-13-2004, 11:12 PM

I dont think it would make a difference if you had 2 or not
I think quattro is right, they would just look on to the same sats
I also havent seen any gps software that would be able to utilize 2 gps recievers either

If you want to get better reception, i think getting a good reciever would be a better solution

Naamanf · 10-13-2004, 11:13 PM

Actually more receivers will give you a more acurate position, but you would have to have software the takes into account the location of each receiver. There are multi-receivers systems that can give position within an inch or so.

Big Zack · 10-14-2004, 12:31 AM

I have two GPS receivers; one built into my laptop and the other is a USB puck.

I have compared reading from two in two different applications, but I am not aware of any standard software (iGuidance, Copilot, SAT, Street Atlas) that will let you use more than one GPS receiver at a time.

-Z

Dominik · 10-14-2004, 04:15 AM

D3 SDK lets you take data from a Buffer which you could fill by reading the GPS data stream yourself. It wouldnt be too hard to read the COM port data from each of the GPS and do some calculations before pushing it into the buffer.

The thing i thought of was to have the GPS doing the readings half a second off synch. thatway you would get GPS signals every 0.5seconds instead of once per second...

GT65coupe · 10-14-2004, 04:39 AM

Quote: Originally Posted by Dominik

D3 SDK lets you take data from a Buffer which you could fill by reading the GPS data stream yourself. It wouldnt be too hard to read the COM port data from each of the GPS and do some calculations before pushing it into the buffer.

The thing i thought of was to have the GPS doing the readings half a second off synch. thatway you would get GPS signals every 0.5seconds instead of once per second...

interesting, can you code that?

stevieg · 10-14-2004, 05:09 AM

the only thing I think would be worth doing would be, if you are writing your own GPS application (or D3 interface, or a 'third GPS com port device') would be to monitor both, and output the reading of the one with the best lock - and if the other one goes tit's up, sending the required reset commands.

Otherwise it's a lot of work for not much improvement

JC-S60 · 10-14-2004, 05:30 AM

What would make a difference is putting one at the windshield and another at the back window. That way, the complete sky would be "visible" and locks would be to different sats.

Joa

Confused · 10-14-2004, 06:07 AM

Good thinking, batman!

I'm going to grab my GPS receiver, and along with Danceheaven's, i'll see if i can figure anything out

Garry

Enforcer · 10-14-2004, 08:07 AM

Quote: Originally Posted by Confused

Good thinking, batman!

I'm going to grab my GPS receiver, and along with Danceheaven's, i'll see if i can figure anything out

Garry

Sounds kinky

Ricky327 · 10-14-2004, 08:49 AM

You are better off buying an external antenna (if your GPS have the connector for it) :

http://www.maplin.co.uk/Module.aspx?...dID=&doy=14m10

http://www.maplin.co.uk/Module.aspx?...dID=&doy=14m10

Placing 2 GPS one at the back and at the front will only give you like the average position in the middle. If the signal are weak in the area both GPS wont be accurate anyway.

Its probably worth a try if you got access to 2 GPS and the program to average out the position.

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