|Navigation Testing & Development|
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How to use GPS record, replay and simulation to test your navigation systems more effectively
Different road designs, numerous types of intersections, and driving on the left or right-hand side are the tip of the iceberg when it comes to challenges faced by navigation system developers.
In addition, the cost of field testing in many countries and on different continents is large. So how do you accurately and consistently test your firmware or software? For many leading navigation suppliers and developers, the answer lies in record, replay, or simulation of GPS and Multi-GNSS signals.
Using Racelogic’s LabSat GNSS record, replayer and simulator, you can create real live traffic situations and journeys. Multiple scenarios can then be replayed many times in your testing facility.
Not only will you test against real signal conditions but you will be able to see how your software performs if drivers go off route and miss turns. The ability for your software to recover from the unexpected is essential in today’s competitive navigation marketplace, because this is when your customers will need your product the most.
How do you know what the recording conditions were like during the test?
During a ‘Live Sky’ GNSS signal recording, LabSat records the exact time as part of the file. By using a Racelogic Video VBOX data logger at the same time to record a live video file, the exact time coding is recorded into the video.
LabSat can then replay the recorded GNSS scenario and send the time synchronisation to the PC playing the video. This means the footage is perfectly synced together with the GNSS RF signals, which allows you to see the video replaying the journey at exactly the same time as your navigation software is travelling along the route. Any failures can be observed repeatedly, and after a solution is created you can test against the exact conditions recreated during the replay.
By recording scenarios in difficult signal reception conditions such as tunnels and underpasses, and by going on and off the scheduled route, the real life complexity of modern driving conditions can easily be captured in a way that is not possible with simulators.
These recorded scenarios can then be used time and time again to standardise your testing regime so that different versions of software and firmware can be verified to ensure consistent performance. You can even test different versions of your mapping database.
LabSat also enables you to record information from an Inertial Measurement Unit (IMU) together with CAN vehicle data into the recorded file, to be replayed exactly as it happened. This versatility and consistent replay quality has given LabSat the market leading position in the global GNSS record and replay market.
LabSat will record both the US based Wide Area Augmentation System (WAAS) and the European Geostationary Navigation Overlay Service (EGNOS) signals alongside the GPS, GLONASS and BeiDou navigation signals. Therefore, during replay you can test your device’s ability to use these services without leaving the Laboratory.