Smart Wireless Sensing by Zheng Yang & Kun Qian & Chenshu Wu & Yi Zhang

Author:Zheng Yang & Kun Qian & Chenshu Wu & Yi Zhang
Language: eng
Format: epub
ISBN: 9789811656583
Publisher: Springer Singapore

The velocity output of Widar and ground truth are aligned by minimizing mean square error after alignment. The location outputs are aligned according to the corresponding velocity. Both velocity and location errors are calculated in a point-to-point manner.

6.6.2 Overall Performance

Performance in Velocity Tracking

We first report the performance of Widar on tracking target velocity, in terms of both speed and direction. For speed, we compare Widar with a naïve method: Max PLCR, which takes half the largest PLCR among all links as its estimate of target speed. In addition, we show the estimation errors when only one link is available (denoted Single PLCR). Figure 6.8a plots the CDF of relative speed errors of three methods over all trajectories. As illustrated, Widar achieves the highest accuracy with a median error of 13%, while those of Max PLCR and Single PLCR are 19% and 40%, respectively. The favorable performance of Max PLCR attributes to the deployment of links, where links are deployed in two orthogonal directions in the experiment.

Fig. 6.8The overall performance of velocity and location tracking. (a) Velocity amplitude. (b) Velocity direction. (c) Location. (d) Tracking error map

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