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❱ ❱ With just a 100mm rollover height, the GST collapses safely on impact without damage to the test vehicle


❱ ❱ Andrew Pick of AB Dynamics believes the Mk2 GST fulfils the complex needs for repeatable testing for autonomy and ADAS


GST is a vital tool for testing and proving emerging ADAS technologies, helping to accelerate their route to market,” he says. For propulsion the Mk2 GST features a substantial 3.5kWh


battery that is capable of sustaining a full day’s testing on a single charge, but if necessary can be quickly recharged or topped-up at the track-side via the inbuilt battery management system. Additionally, the lithium iron phosphate battery is formed from six identical packs that can be easily removed for safe shipping. The battery provides the power to electric motors that can


accelerate the GST to velocities in excess of 80km/h and all while being precisely controlled.


POSITIONAL CONTROL


Controlling the position of the target vehicle in relation to others that are in use as well as in relation to the test vehicle is achieved using AB Dynamics’ proprietary TrackFi radio. TrackFi offers point-to-point data transfer using the


standard 5GHz WLAN frequency, paired with specially designed, high-gain antennas. Data transfer bandwidth of 6 Mbit/s is possible at a range of 1km, making it suitable for sending real-time test data or even video. TrackFi enables positional data to be shared with other AB


Dynamics controllers via the Synchro interface, which allows its motion to be precisely synchronised with the test vehicle and other ADAS targets. Pick explained that with its improved performance across a


range of test-critical metrics and its advanced synchronisation capabilities, the Mk2 GST enables the safe testing of ADAS and autonomous systems in a broad range of scenarios, making it an ideal platform for ADAS targets. “When it comes to vehicle testing, repeatability is key. Using Synchro, you can construct highly precise and repeatable events, which ensures that data is collected efficiently and effectively,” he says. Testing with real vehicle targets is unthinkable given the risk of writing off a test car and the potential for injury. “In contrast the electrically driven GST and Soft Car 360 provide a test tool that can be reused time and time again,” Pick concludes.


LONG DISTANCE TELEMETRY The TrackFi telemetry system used on the GST was designed to enable reliable low latency data transfer over distances of 1km or more. Using standard licence free WiFi radio frequencies, TrackFi allows data to be transferred between moving vehicles or between a moving vehicle and a stationary base station, making it ideal for vehicle testing telematics at proving grounds. ABD developed TrackFi to fulfil the requirements


for reliable data transfer between a base station and one or more moving vehicles. Having tested existing telemetry systems, ABD identified a need to combine reliable data transfer over long distances with the use of licence free radio frequencies. TrackFi uses the 5GHz wireless LAN (WLAN) frequency


in accordance with IEEE 802.11n together with specially designed high gain antennas. Configuration software is included which includes


a survey function and a real time display of signal strength for each unit being used. The survey function allows the analysis of existing WLAN networks in operation at the proving ground, permitting the user to select the optimum frequency band to minimise interference. TrackFi has a range of over 1km in a 360° horizontal plane with line of sight, assuming no interference is present. It uses a standard R145 Ethernet cable for data connectivity and is available with rubberised magnetic pads or vacuum mounts, so it can be used with different vehicle materials.


❱ ❱ The TrackFi telemetry system is easily mounted on vehicles and provides communications on the test track for up to 1km


Testing & Test Houses 2018 /// 3


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