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Racing » Products » Data loggers » DL1 » DL1+20Hz GPS

DL1 Data Logger with 20Hz Advanced GPS

The 20Hz GPS option for the DL1 is quite simply the best and most accurate available of any competitor data logging system. The GPS makes a unique calculation of position and speed 20 times a second with no interpolation or other "tricks".

The unique GPS technology has been developed in house by our engineers and tested in the most challenging racing environments - the accuracy is nothing short of a break though at this price point and in this respect there really isn't any competition.

The diagram below illustrates how the standard 5Hz DL1 processes GPS data, internally:

With the 20Hz option (shown below) the DL1 logs only the raw GPS data and uses the processing power of the computer to calculate speeds and positions. It is the processing power of the PC and the calculations applied to the data that makes real improvements.

There are 2 modes that the GPS system can be used in:

• Standard 20Hz mode. In this mode the raw GPS data is logged from the GPS module in the DL1, and when you process the data the raw GPS measurements are converted into speeds and positions etc

• Advanced PPP 20Hz mode. This is a more advanced processing mode that downloads GPS corrections from the internet before processing the data. This results in even better positional accuracy! This mode obviously requires that the PC is connected to the internet at the time that you process the data.

There are a few important things to note about the 20Hz options:

• Some of our competitors claim that our GPS is not really 20Hz in some way. This is simply not true, we wrote the code in house and absolutely guarantee that this is a genuine 20Hz system without any caveats whatsoever.

• The main benefit of this GPS system doesn't really come from the fact that it is 20Hz, this is simply a measure of the number of measurements that are taken every second. The key to the systems performance is in the maths that is used to make the calculations - using the processing power of the PC to calculate the GPS position/speed we are able to make some real improvements. Even if we were only calculating the updates 5 or 10 times a second then our GPS technology would be superior!

• Typically the 20Hz option won't improve "poor" GPS data, it will make good GPS data even better. The situation is the same with the PPP option, this doesn't correct for a poor GPS lock, but instead just improves an already good data set. You must still mount the GPS antenna correctly to get good GPS accuracy.

• Note that due to licence restrictions, the 20Hz GPS data will have its resolution limited when you export it to an external application. The full GPS speed/position resolution will only be available in the analysis software. Exported data will have a resolution of 1m/s and 2.5m for speed and position respectively.