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AnalysisOptions / SpeedOptions

AnalysisOptions.SpeedOptions History

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August 07, 2012, at 11:45 AM by racetec -
Changed lines 9-17 from:

This new “speed” tab was added into version of analysis 8.2.12+ to give more detailed control over how speed is calculated in the software. Note that speed is also used in the calculation of distance and track map, so if there are problems with speed – then it will also affect these variables.

There are 5 options for how to calculate speed. For nearly all typical cases, the speed should be calculated from either GPS only, or more commonly a combination of GPS and accelerometer information.

In special cases where maybe GPS data is particularly poor or even missing altogether then it might be useful for also use wheel speed either in isolation, or combination with GPS and accelerometer.

Note that speeds taken from wheel sensors can be problematic and inaccuracte – for example under heavy braking you will get slippage of the tyre which can cause errors.

VERY IMPORTANT: if you choose to use wheel speed in the speed calculations, and there is a problem with the wheel speed calculation then it will cause problems!! Be absolutely sure that before using this it is correctly set up and reading correctly!! There is information on setting up wheel speed in the software here.

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The vehicle speed in analysis can be calculated in a number of different ways, which can be selected from the option list.

In most applications it is normally desireable to calculate speed from a combination of GPS and accelerometer data.

GPS only can be useful in applications where the acceleretomer data was not useable for some reason, the most common being that the data was recorded on a boat, or the logger was not mounted correctly – for example maybe it was just resting on a seat and allowed to move about. In these cases using the accelerometer data will cause considerable inaccuracies.

The other options use wheel speed to aid the speed calculations. For most applications this is less accurate than GPS due to problems of the wheels locking up and spinning under load, however in cases where the GPS data is poor using wheel speed is a useful option.

Note that distance is calculated by analysis based on speed, so the options that you choose for speed with also directly affect distance. Speed and distance are also used on the position calculations, so again any problems in speed will impact the track mapping.

VERY IMPORTANT: If you use wheel speed to calculate speed in the analysis software, but wheel speed is incorrectly configured, the results that you get in the analysis software will be nonsense. There is information on setting up wheel speed in the software here.

September 28, 2011, at 02:28 PM by racetec -
Changed line 17 from:

VERY IMPORTANT: if you choose to use wheel speed in the speed calculations, and there is a problem with the wheel speed calculation then it will cause problems!! Be absolutely sure that before using this it is correctly set up and reading correctly!! There is information on setting up wheel speed in the software here.

to:

VERY IMPORTANT: if you choose to use wheel speed in the speed calculations, and there is a problem with the wheel speed calculation then it will cause problems!! Be absolutely sure that before using this it is correctly set up and reading correctly!! There is information on setting up wheel speed in the software here.

September 28, 2011, at 02:19 PM by racetec -
Changed lines 1-2 from:

Speed page:

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Speed Options


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September 28, 2011, at 02:18 PM by racetec -
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Speed page:

This new “speed” tab was added into version of analysis 8.2.12+ to give more detailed control over how speed is calculated in the software. Note that speed is also used in the calculation of distance and track map, so if there are problems with speed – then it will also affect these variables.

There are 5 options for how to calculate speed. For nearly all typical cases, the speed should be calculated from either GPS only, or more commonly a combination of GPS and accelerometer information.

In special cases where maybe GPS data is particularly poor or even missing altogether then it might be useful for also use wheel speed either in isolation, or combination with GPS and accelerometer.

Note that speeds taken from wheel sensors can be problematic and inaccuracte – for example under heavy braking you will get slippage of the tyre which can cause errors.

VERY IMPORTANT: if you choose to use wheel speed in the speed calculations, and there is a problem with the wheel speed calculation then it will cause problems!! Be absolutely sure that before using this it is correctly set up and reading correctly!! There is information on setting up wheel speed in the software here.

Page last modified on August 07, 2012, at 11:45 AM