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Park assist

Technical Articles July 19, 2018

Park assist systems may not get the same level of recognition as fully-fledged ADAS safety systems, however, they’re probably more important to some drivers and are certainly used more often. When testing and developing park assistance systems, the position of the test vehicle compared to other vehicles and fixed assets such as kerb edges and street furniture is of key importance. More specifically, modelling both the VUT and any targets as polygons is essential to allow accurate measurement of the separation between the VUT and targets at all times.

What the RT and RT-Range S delivers

• Relative accuracy 2 cm

• Heading accuracy 0.1°

• Real-time birds-eye view showing measurements

• Ability to track multiple objects in real-time

Getting the measurements you need

For testing and validation, park assist scenarios can be set up using real vehicle assets or balloon vehicles. In all cases, the test vehicle will be fitted with an RT GNSS-aided inertial navigation system (GNSS/INS). In most cases (because of the low speeds involved) a dual-antenna model is chosen to maintain the best heading accuracy at all times. A base station is also set up to broadcast differential corrections that allow the RT to achieve RTK integer 1 cm accuracy. Finally, an RT-Range Hunter is also installed.

Park assist testing with OxTS RT-Range

In order for the RT-Range Hunter to calculate measurements to assets such as other vehicles, it needs to know where they are. There are two options here. Either the vehicles can also be fitted with RT and RT-Range products, but this isn’t cost-effective unless you already have additional units. Instead, the vehicles can be properly measured, and once parked, their position and orientation can be entered as fixed values. The RT-Range Hunter will then accurately calculate the shortest distance between the test vehicle’s polygon perimeter shape and those of the parked cars.

The kerb can be handled in the same way. Normally this is simply entered as a long polygon shape and assigned a location and heading the matches the real-world test scenario.

During testing, feedback including all measurements and a Bird’s Eye View is available in real-time using our free software. Once testing has been concluded, all data can be downloaded, post-processed, tested and then exported into CSV format for further analysis.

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