Zocht je misschien: ultrasonic, ultrasound?
Mapping swarms of resource-limited sensor motes: Solely using distance measurements and non-unique identifiers
Duisterwinkel, Erik H.A.; Dubbelman, Gijs; Demi, Libertario; Talnishnikh, Elena; Bergmans, Jan W.M.; Wörtche, Heinrich (Sensors And Smart Systems)