Improving sampling rate with multiplexed ultrasonic emitters

This paper presents a position estimation method for multiple ultrasonic emitters which are activated simultaneously. Locations of ultrasonic emitters are generally calculated from distance data obtained at receivers, but the emitters must be activated one after another to avoid crosstalk. Thus, the sampling rate for each emitter decreases as the number of emitters increases. The authors solved this problem by activating multiple emitters simultaneously and applying a newly developed position estimation algorithm. This paper presents the theoretical analysis and the results of simulations and experiments.