[Talk-transit] Railway. Source= GPS

Shaun McDonald shaun at shaunmcdonald.me.uk
Fri Sep 25 09:29:47 BST 2009


On 25 Sep 2009, at 09:04, Frankie Roberto wrote:

> Hi Dave,
>
> Some people have found more luck getting a GPS signal in the  
> carriage ends (I believe they're called the vestibules?) - however  
> it's a pretty uncomfortable journey stood their the entire time.

Yes it called a vestibule.

>
> Otherwise, it simply depends on the type of train (some are more  
> shielded than others), and, I guess, the type of GPS device (ones  
> with bigger aerials might cope better). Also, I think it helps if  
> you get a GPS fix before getting on the train - they seem to have  
> more difficulty getting a fix when moving at high speed (or at least  
> mine does).
>

I've found that the GPS you use can make a huge difference in the  
signal they can get.

> Where are you mapping? Most of the UK train lines should already be  
> fairly well mapped.
>

There are quite a lot that need some fine adjustment/more points added  
as they have only been roughly mapped.

Shaun

> Frankie
>
>
>
> 2009/9/25 d f <fac63tempt at yahoo.com>
> Hi
>
> I've seen a few railway ways where it says the source is GPS. I've  
> tried a couple of times but got absolutely no signal. I guess the  
> roof of the carriages are shielded.
> Short of sticking an aerial on the roof or walking the tracks, what  
> tips could you give me to get a recording of my journey?
>
> Cheers
> Dave F.
>
>
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>
>
> -- 
> Frankie Roberto
> Experience Designer, Rattle
> 0114 2706977
> http://www.rattlecentral.com
>
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