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Re: GPSD For Real Time Application

From: Kai Harrekilde-Petersen
Subject: Re: GPSD For Real Time Application
Date: Sun, 29 Dec 2019 21:42:09 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2


My bad, I did not read your original email before replying to Bernd's email. I now went back and read it.

You're right, the Neo-m8l/u modules should be integrating the data from the GNSS with the on-board gyro and accelerometer data. You don't need to do your own integration of sensor data using (Kalman) filtering. The neo-m8l/u modules may also be able to get wheel-speed input, but the links on the webpage doesn't seem to work for me.

Q2) You ask for 5 meter accuracy. What is the actual purpose for this goal? Are you looking for specific location at each GPS point, or are you looking to determine when the vehicle passes a specific GPS point?

Besides this, look closely at Gary and Greg's replies.

Best regards,


On 29-12-2019 18:53, Kashyap Gada wrote:
Bernd & Kai,

Wouldn't the following Module doing those calculations for us? Why do we need to do them manually? or one I am using currently)
If we are using above products do we still need to process the positioning information we have?

I'll go through Kalman filter as per your suggestion. Don't have any model of tracks.

Any specific books/web pages that provide these intricate details?


On Sun, Dec 29, 2019 at 10:28 PM Bernd Zeimetz <address@hidden> wrote:

On 12/29/19 5:37 PM, Kai Harrekilde-Petersen wrote:
> I would more look into adding a 2D (or 3D) accelerometer than a gyro,
> since the train is (very) unlikely to do significant yaw/pitch/roll
> movements (unlike small planes, helicopters and motorcycles).

Yes, that is what I had in my mind, but since you get gyro +
accellerometer in one chip these days, I somehow started to call them
gyro only ;)

Gyro might still be interesting, though, if you want to measure steep
climbs or call the rescue if the locomotive is rotating in unexpected

 Bernd Zeimetz                            Debian GNU/Linux Developer                      
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