|
|
The VirtualCup functioning is based on the GPS' data reception.To calculate the better way the GPS' times, we found 2 linked troubles : - first, the fact we do not receive more than one data per second, secondly, the position given by the GPS can not be more precised than 5 meters.
In order to solve those two troubles, we tried to estimate the maximum mistake. If we image to place the start line in a straight line, and we cross the final line at 150 km/hour.So, we can have a difference of 10 meters. 10 meters at 150km/hour is about 0,24s (time to make 10 meters ).
I want to make a precision : this is the biggest mistake you can have.An other point, for 10 rides, this mistake will not be bigger than 0,24s in the all road, because the precisions offset each other : in fact, if you see a turn 0,24s better, it will be implicitly the same for the next one.
More, in order to refine our times, we use an interpolation wich is funtioned of 2 points' place ( before and after the final line )compared to the one after the final line. We also use the speed to refine our calculations.
That is why, we advise you to prioritize fast straight lines to position the start and final lines. In order to have times nearest from reality.
Here comes the results from VirtualCup precision / Manual times very far away. To tell you, the average speed of the final line was about 80km/hour,which gives when you use the calculation below : a mistake which is about 0,45s. :
| Rides | Times | VirtualCup times | Delta |
| 1 | 55:05 | 54:81 | -0.24s | | 2 | 31:85 | 32:11 | +0.26s | | 3 | 54:00 | 53:94 | -0.06s | | 4 | 32:37 | 33:44 | +0.07s | | 5 | 56:78 | 56:95 | +0.17s | | 6 | 34:38 | 34:23 | -0.15s | | 7 | 53:75 | 53:56 | -0.19s | | 8 | 33:12 | 33:12 | +0.15s |
Which represents, on average in this test, an average mistake +/- 0.16s. So we are less than the maximum theoretic value : 0.45s. And obviously the more the speed increases, the more this mistake should reduce. So we do not reach precisions used in competition, but for fun, those results are reasonably good.
|
|
Description