Approximative Sensor Data Resynchronization for Wireless Burst Transmission Protocols

We present BurstLR, a novel online resynchronization method for wireless burst transmitted sensor signals. Instead of clock alignment, our method uses approximative timestamp realignment by estimating the relation between sensor clock and receiver clock at the receiver. Only the sensor and arrival timestamps of samples are required. Thus, no additional communication as well as hardware is needed. In our experiments with two wireless sensor nodes (Nicla Sense ME), we achieved a reduction of the average quadratic distance with dynamic time warping between resynchronized acceleration signals that recorded the same arbitrary human motion trajectory by 54.95 % to 76.91 % compared to signals that used the arrival times for synchronization.