polaris Navigation Performance Assessment
In order to evaluate an application, the first thing to do is to define the combination of systems and sensors to be used, as well as the service area or trajectory. In polaris jargon, this is called a scenario.
Selecting the GNSS and regional (SBAS) augmentations is quite simple. Just pick up the augmentation you want to include from a list. Adding Local Elements (GBAS, DGNSS, pseudolites, radio mobile positioning or balises) is also very easy. Local Elements are organised in networks. You can add an entire network with a simple click, or individual local elements as well.
You will also need to define the user terminal, including GNSS/SBAS receivers, and filters and sensors characteristics.
To complete the scenario definition, select the service area or trajectory over which navigation performance will be assessed. You can select one from the list, or define one during scenario definition.
This completes the definition of the scenario. Now you can run multiple analyses for that scenario.
You can obtain Accuracy, Dilution of Precision (DOP) and number of navigation signals received for given availability levels (percentiles). Vertical, horizontal, long-track, cross-track, positioning, timing and global accuracies and DOP can be computed.
You can also obtain availability figures for given threshold values. Selection of multiple figures is allowed. For example, you could determine the percentage of times for which the following conditions are simultaneously met:
- Vertical accuracy better (lower) than 12 meters
- Horizontal accuracy better (lower) than 7 meters
- The signal of at least 6 satellites is being received