Why 50Hz GPS?

50Hz GPS is 5 times faster than 10Hz GPS

We'll try to illustrate this with the real data from our Ducati Panigale V4s test at Jerez track.

At Jerez finish line, Ducati speed is 228kmh. At that speed, different speed GPS's can report the location at following intervals:

Speed 228kmh Measurement interval (ms) Traveled Distance (meters)
10Hz GPS 100 6.33
50Hz GPS 20 1.26

So, with 10Hz GPS, you get a location or speed measurement only every 6.33meters.  With 50Hz GPS, the traveled distance between measurements is 1.26meters. This is significant distance and gets worse faster you go.

To illustrate this, here is the traveled distance shown at the track.

Traveled distance difference between 10Hz vs 50Hz GPS measurements

How fast is GPS7 at 228kmh?

eTesta GPS7 has a feature where the device can calculate in realtime the distance to the finish line in meters. This feature is used to calculate the lap times and is saved into the logs.

In the graph below, see the Speed and DistanceToLapMarker value which is the distance to the finish line in meters.

At 228kmh speed, GPS7 was able to calculate the distance in realtime to 1m accuracy. With 10Hz GPS, this could be somewhere between 0 to 6.33m, depending when the measurement period happens to be.

Analysis Tool: GEMS ProAnalysis

Other thing you can see from the graph is that you can even see the shifts during the front straight. By default, GPS7 doesn't have any internal filters for the speed data, assumption is that the filtering is done in the Analysis tool or post processing. 

Feel free to contact us if you have questions about our 50Hz devices.

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