Author Topic: Receive a GPS Signal onboard a Train?  (Read 7808 times)

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Offline cdev

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Re: Receive a GPS Signal onboard a Train?
« Reply #25 on: October 13, 2017, 12:47:48 pm »
@Rerouter's advice is perhaps the most important thing.

Simply remember to get a decent fix outdoors under clear sky earlier..which takes a minimum of around 13 - 15 minutes.

That 13 minutes is what it takes to pick up the ephemeris under ideal conditions.  Cell phone GPSs which use AGPS download the ephemeris from the network, but often don't work without it.

Tha ephemeris data is what allows the GPS to pick he very weak signals out of he noise. It knows in advance where they are going to be in the sky, and when, and where itself is, roughly.

You should be in a better position to pick it up with that data already in your GPS's memory.
« Last Edit: October 13, 2017, 12:53:59 pm by cdev »
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Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #26 on: October 13, 2017, 01:18:49 pm »
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did you have a full 3D fix at the station before boarding the train
No I had something to carry but the first Train ride was just ~30min before who I use it.
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but in reality a modern gps / glonass / bidao reciever
The can Receive just GPS and maybe if sometimes the European work the should come an Update for.  :palm:
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If you have an android phone, you can compare with something like the app "gps status" to see how well your reciever is working in comparison
Where can I download the Software?
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But, simply remember to get a decent fix outdoors under clear sky earlier..
I cant board the Train with an Laptop in my Hand.  :palm:
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and don't remove the batteries or restart it
It is an USB GPS Mouse. The Software show me Sat.

does anyone want the Recorded Data and analyse it?
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Offline Rerouter

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Re: Receive a GPS Signal onboard a Train?
« Reply #27 on: October 14, 2017, 04:39:02 am »
Quote
did you have a full 3D fix at the station before boarding the train
No I had something to carry but the first Train ride was just ~30min before who I use it.
Quote
but in reality a modern gps / glonass / bidao reciever
The can Receive just GPS and maybe if sometimes the European work the should come an Update for.  :palm:
Quote
If you have an android phone, you can compare with something like the app "gps status" to see how well your reciever is working in comparison
Where can I download the Software?
Quote
But, simply remember to get a decent fix outdoors under clear sky earlier..
I cant board the Train with an Laptop in my Hand.  :palm:
Quote
and don't remove the batteries or restart it
It is an USB GPS Mouse. The Software show me Sat.

does anyone want the Recorded Data and analyse it?

Ok, you can get the program off the app store. Looms like a play button.

You can board a train with a folded laptop in hand. Go in to the power settings and turn off the sleep when lid is closed option. This way it remains running.

This will also fix the losing power issue. While at the same time most laptops also have an always on phone charging port.

Sure post the logs. Havent yet played with bare metal gps logs.
 

Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #28 on: October 14, 2017, 02:45:24 pm »
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Ok, you can get the program off the app store. Looms like a play button.
Where is the Store located? Do you have an Adress? I never saw it before.
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You can board a train with a folded laptop in hand.
  :scared: The risk that some steal is very hight.
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Havent yet played with bare metal gps logs.
Its from my Ublox Software thing.
I will upload it to my Webspace and post the URL.
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Offline Rerouter

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Re: Receive a GPS Signal onboard a Train?
« Reply #29 on: October 14, 2017, 08:52:26 pm »
Go to this address on your phone, if its an android phone it will give you the option to install it.

https://play.google.com/store/apps/details?id=com.eclipsim.gpsstatus2

If its an iphone it looks like it costs $3

https://itunes.apple.com/us/app/gps-status-toolbox/id1198499960?mt=8

As for the laptop, fine have it folded in your bag as your about to board with the gps mouse sticking out the zipper.

The threat of theft is fairly low where i live so i dont normally think about that angle.
 

Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #30 on: October 14, 2017, 09:03:27 pm »
Here are all files I record: publictransportforum.at/images/extern/GPS_Log_Wien_Graz_Feldkirch_Wien.rar
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Go to this address on your phone, if its an android phone it will give you the option to install it.
It is there want to login wo something I never saw before.  :--
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it folded in your bag as your about to board with the gps mouse sticking out the zipper.
The HDD get damage when I move my backpack.
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The threat of theft is fairly low where i live so i dont normally think about that angle.
Its very dangerous to have something bigger in the Hand like a laptop or a tablet the could grabbed very easy and the can run away with.
Made in Japan, destroyed in Sulz im Wienerwald.
 

Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #31 on: October 18, 2017, 11:16:10 am »
Does anyone here look into the GPS Recording?
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Offline 4CX35000

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Re: Receive a GPS Signal onboard a Train?
« Reply #32 on: October 29, 2017, 09:07:12 am »
Does anyone here look into the GPS Recording?


A few year back at work we had to record GPS position various data surveys and that used a Garmin GPS60 with the USB interface and external antenna. From what I recall the output would be recorded to file in CSV format with other data from a GSM receiver. CSV was used as it is the most widely compatible format and efficient for storing data we required at the time.

The Garmin GPS60 can record the data into its internal memory. The storage contained the normal altitude, longitude, and latitude data in various intervals from 1 second upwards. The downside from what I recall was the internal memory was only 1MB, so the data interval needed to be 3 seconds or greater to allow the Garmin to be used for a full working day. I don't recall how the data was downloaded, but it was possible to save it as a text file or CSV and open it in Excel, whilst the output format location (Northing/Eastings or Degree's decimal) was dependant upon the setting within the software/firmware

« Last Edit: October 29, 2017, 09:09:03 am by 4CX35000 »
 

Offline Rerouter

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Re: Receive a GPS Signal onboard a Train?
« Reply #33 on: October 29, 2017, 09:18:31 am »
The recording is just a serial dump of nema strings, Its a bit more than i am willing to decode myself, It opens fine in notepad ++,
 

Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #34 on: October 29, 2017, 09:21:18 am »
I used GPSBabel as converter to Google KML File. I had to Select "NEMA...." as original Format.
Ublox Software Write some Debug Information into the File.

Are anyone interested in the other Recordings?  :-//

Does anyone here have experience with GPS Data Analyse?
Made in Japan, destroyed in Sulz im Wienerwald.
 

Offline 4CX35000

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Re: Receive a GPS Signal onboard a Train?
« Reply #35 on: October 29, 2017, 10:13:58 am »
I used GPSBabel as converter to Google KML File. I had to Select "NEMA...." as original Format.
Ublox Software Write some Debug Information into the File.

Are anyone interested in the other Recordings?  :-//

Does anyone here have experience with GPS Data Analyse?


I recall it was possible to download the data from the GPS60 into various different formats and also possible to import the data into Google Earth and show the individual points on Google Earth and export the file as a KML file. In Google Earth the data was shown on the map as a selection of continuous dots were the GPS data was recorded on the route and these could be manipulated as you require. I don't recall there being any need to convert the file into any other format, but it was 10 or more years ago when I worked on this and I have forgotten much of the inner detail.

At work we only ever used Google Earth and I think a program called MapSource to check the route against the map. The important data for work purposes was data required the GPS data alongside GSM signal strength and GSM quality data for propagation prediction purposes, so a HP iPaq was used to interface with a Ericsson GSM transceiver and the GPS60 to produce the data file we needed.

You can buy external antenna which can be mounted internally on a car window, so it might be worth looking at one of these antenna and mount the antenna using suction cups to the train window.

Whatever method you decide to use, the file result will be a file with individual timing/locations points were the GPS unit has recorded Time, Date, Latitude, Longitude and Altitude.
 

Offline NivagSwerdna

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Re: Receive a GPS Signal onboard a Train?
« Reply #36 on: October 29, 2017, 10:37:02 am »
Its very dangerous to have something bigger in the Hand like a laptop or a tablet the could grabbed very easy and the can run away with.
That's a pretty sad statement of affairs.  Is it really that bad?
 

Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #37 on: October 29, 2017, 11:25:32 am »
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Is it really that bad?
Not that bad as in Italy, Spain. It depent on the Date and Time and the Railway Station. Onboard the 1Class is quite safe.  :popcorn:
Thanks you Mrs. Merkel.  :palm:

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You can buy external antenna which can be mounted internally on a car window, so it might be worth looking at one of these antenna and mount the antenna using suction cups to the train window.
I on the most Trains I tried to get a good Signal just the Railjet failed totally.
After some Minutes without a Signal the Receiver or the Software drive insane and I get no signal anymore.
Made in Japan, destroyed in Sulz im Wienerwald.
 

Offline NivagSwerdna

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Re: Receive a GPS Signal onboard a Train?
« Reply #38 on: October 31, 2017, 04:01:46 pm »
Quote
Is it really that bad?
Not that bad as in Italy, Spain. It depent on the Date and Time and the Railway Station. Onboard the 1Class is quite safe.  :popcorn:
Thanks you Mrs. Merkel.  :palm:
I'm increasingly glad we have a moat.
 

Offline cdev

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Re: Receive a GPS Signal onboard a Train?
« Reply #39 on: October 31, 2017, 11:41:48 pm »
GPSBabel is the way to go for GPS log file conversion on all sorts of computers. http://www.gpsbabel.org/

GPSBabel is FOSS and doesnt connect up to anything external.

Many GPS data loggers log in the GPX data format. Thats likely the best all around format for that kind of thing.

GPSBabel can turn your track logs into KML files that can be imported into Google Earth.
"What the large print giveth, the small print taketh away."
 

Offline cdev

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Re: Receive a GPS Signal onboard a Train?
« Reply #40 on: October 31, 2017, 11:45:49 pm »
I have a bunch of USB GPS's they all will store the so called ephemeris data for a while after they have been used, basically what I mean is use it a bit before you travel, like that same day.

Don't completely "cold start" it, because almost any GPS will have issues if you cold start it in a basement..or a metal box..

Behind mirrored glass in a metal train car is probably similar.
"What the large print giveth, the small print taketh away."
 

Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #41 on: November 01, 2017, 10:16:37 am »
But why does it drive insane after some short Signal Loss?  :-//
Made in Japan, destroyed in Sulz im Wienerwald.
 

Offline EmmuWisl

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Re: Receive a GPS Signal onboard a Train?
« Reply #42 on: July 27, 2021, 01:03:34 pm »
So, thank you for the information. I usually plan in advance how I will go and study the whole way. Therefore, it may not be useful to me. I was recently in Germany on a train and my gps did not catch it. Although if you lean out of the open window a little, everything catches perfectly. As a person who insanely loves the atmosphere of trains, this is very important to me. But the only thing I use for this is the train schedule https://www.dbreiseauskunft.com/de/ here.  So I don't think that I can use this, and nevertheless this information will be useful to my husband
 

Offline Lord of nothing

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Re: Receive a GPS Signal onboard a Train?
« Reply #43 on: July 27, 2021, 04:34:07 pm »
 ;) dont worry normally there is an Public Announcement before you reach the Station.
You can also use for Austria fahrplan.oebb.at .
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Offline radiolistener

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Re: Receive a GPS Signal onboard a Train?
« Reply #44 on: July 28, 2021, 02:20:45 am »
The problem on the new Cars who have Windows who have a Metal Coating on. My ordinary USB GPS Receiver dont work.

Just install GPS antenna outside a car or a train and it will works  :)
 


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