A novel ultrasonic ranging method used for single station indoor GPS

作者：Wu Jun; Zhu Jigui; Yang Linghui^*; Shen Mengting; Xue Bin; Liu Zhexu

来源：TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL, 2015, 37(1): 25-32.

DOI：10.1177/0142331214524223

• iGPS
• time difference
• time of flight
• two-frequency pulse wave
• ultrasonic ranging

Indoor GPS is one of the most popular positioning systems own to its high accuracy, real-time characteristics and multi-task management. In order to simplify the calibration process and extend its application, a single station model was presented recently. This paper proposes a novel ultrasonic ranging method used for the single station model. The traditional high-accuracy ultrasonic ranging method mainly uses a phase detection method by transmitting a multiple-frequency continuous wave. However, this method requires high accuracy of the phase detector and is still limited to small-scale application as a result of applying a continuous wave. Based on the constant time difference between the corresponding zero-cross points, this paper proposes a novel two-frequency pulse wave method, which can estimate the time of flight using the time differences between two received waves. Then a least squares estimation is used to eliminate random errors. Finally, an ultrasonic ranging experiment was conducted to validate its feasibility and stability.

• 出版日期2015-1
• 单位天津大学