LabSat 3 Turntable Solution

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LabSat 3 Turntable System by RACELOGIC is an effective and affordable GNSS Navigation Dead Reckoning (DR) Simulator.

If you are selling, testing or developing dead reckoning (DR) products incorporating GPS engines, then you'll find the LabSat 3 Turntable System makes your job easier, quicker and more effective. 

Why use a turntable?

Video VBOX replay of an onboard navigation screenTo 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.

How does it work?

Firstly the LabSat 3 records the Global Navigation Satellite System (GNSS) data.

The LabSat then streams the previously recorded file containing satellite navigation signals back to the device under test - faithfully reproducing the navigation signals from all of the satellites which were present during the recording.

Any Satellite Based Augmentation Signals (SBAS) WAAS/EGNOS/QZSS signals present are also reproduced.

At the same time the LabSat software also replays the video, turntable and wheel speed data in sync with the satellite signal recording.

The turntable will turn to simulate the rate of turn (yaw) of the original vehicle turning. This results in a full replay of the actual route taken and will stimulate the dead reckoning (DR) system to activate.

As it is based on a real recording the data will replicate the satellite signal loss experienced in city centres and tunnels and maintain the DR solution until the signals are regained, just like the live drive. This makes the replay repeatable time and again to save you significant testing costs.

The LabSat turntable system can also simulate profiles anywhere in the world.

Testing around the globe?

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.
SatGen software showing a Google kml route file upload

Why use a video replay?

LabSat turntable software has the ability to replay a Video VBOX video recording in synchronisation with the live recorded satellite data file. This will allow you to compare the visual position with the test performance. This is particularly useful in assessing the navigation system in and out of tunnels and in areas of poor satellite reception. All the replay data is managed by the LabSat software which has the flexibility to repeat the replay continuously to allow for accurate comparison and analysis.

The Video VBOX system can also create a custom scene in which a range of user defined data can be displayed on the video replay. This includes logos, headers, receiver data and information from the IMU. The picture within picture feature can also record the real time navigation screen data in a test vehicle for comparison, as well as the forward/rear facing camera picture.

LabSat 3 Turntable Software

The turntable system is supplied with full windows PC management software. All the data can be managed by this software to allow for simple and accurate testing. The video replay screen shown below can easily be expanded to a full computer screen display size.

LabSat 3 extensions software replaying synchronised video


Turntable Equipment LabSat 3 Record LabSat 3 Replay SatGen v3 Simulation
LabSat 3 (GPS, Galileo, GLONASS, BeiDou)* yes yes yes
SatGen v3 (GPS, GLONASS, BeiDou) Software* - yes yes
Video VBOX Video System yes yes -
Racelogic IMU 4 Yaw Rate Sensor yes yes -
Wheel Speed (CAN or Speed Pulse) Data yes yes yes
Turntable and Controller System - yes yes

*Single, dual or triple constellation systems are available.