LabSat 3 Turntable

Why use a LabSat turntable? To cover for losses in satellite visibility, which can occur in urban canyons, tunnels and under bridges, most OEM navigation systems have a dead reckoning (DR) capability that utilises vehicle wheel speed data and turn rate information (Yaw). When it comes to testing these systems on the bench, if the dead reckoning signals are not present, the OEM navigation systems will not function correctly. To overcome this, we have developed a full navigation system testing solution comprising of a LabSat 3 GNSS simulator, Video VBOX data logger, turntable and yaw rate sensor. Wheel speed data is recorded by the LabSat 3 from vehicle CAN or wheel speed pulse. The turntable system can use GPS, Galileo, GLONASS or BeiDou satellite constellation data to record live drive data combined with vehicle yaw rate and wheel speed information. The turntable system can work with any GNSS based dead reckoning (DR) system. All of this data is replayed in perfect alignment so that the turntable will simulate the physical turning required to activate the DR in the navigation system under test. The wheel speed and satellite RF data will activate the navigation system and in combination with video provide a realistic replay of the driven route. LabSat Turntable global solution SatGen v3 simulation software can easily create a route and output artificial satellite RF data files. By uploading NMEA or KML files, or by using the Google Maps interface, a complex route can be defined and recorded. When this simulated signal data is replayed the system generates the yaw rate and wheel speed data required to operate the turntable and the navigation unit being tested. By removing the satellite data feed GNSS signal loss can easily be replicated in the navigation system whilst the DR function remains active. Image: SatGen software showing a Google kml route file