Distance measurement method under multiple ultra sonic sensors environment

Robot systems use many kinds of sensor to recognize their environment. Ultrasonic sensor systems are such a sensor type, which is only valid in case of single use. Multiple use of sonic sensors is difficult, since the received signal includes both of its own reflection signal and reflection signals of other sensors. In this paper, the authors propose a sonic measurement method under a multiple ultrasonic sensors environment. In the proposed method, the transmitted signals have their own pattern by using the chaos phenomenon. Each system calculates the cross-correlation of their own transmitted and reception signals, and extract the correct reflection signal. The authors show some experimental results of their proposed strategy.