Ultrasound based positioning using Time of Flight measurements and crosstalk mitigation

Abstract

This paper addresses the problem of adaptive noise cancellation in a multi-channel system. The proposed canceller is a recursive system, based on the Least Mean Squares filter (LMS). This method is analyzed by simulations and experimental results are given. Specifically, it is shown that this technique can improve the accuracy of ultrasound ranging and positioning systems using multichannel receivers.

An innovative ultrasonic time of flight method based on extended Kalman filter for wind speed measurement

“…The measurement range limitation in a signal cycle (2π), characteristic of the phase difference technique, was overcome, since the initialization of the value for ToF is done with the described technique to increase the difference between the signal amplitude peaks. The initial time of flight estimate value is advanced by approximately 1 4 of the receiver signal cycle, with the Kalman filter being responsible for obtaining the phase matching between the estimated and receiver signal, from which the ToF is obtained.…”

“…Measuring techniques based on ultrasonic transducers turned out to be an effective tool for industrial applications and in technical or scientific laboratories, establishing non-invasive measurement processes. Using these techniques, among the possible estimated variables are the measurement of level, distance, volume and fluid velocity [1,2]. Specifically, measurement of fluid velocity using ultrasonic transducers can be done based on the principles of Doppler or time difference methods.…”

“…The time difference based on time of flight estimation can be implemented by conventional techniques such as threshold and phase difference detection or by the use of signal processing techniques such as cross-correlation, phase difference in the frequency domain (DFT, Discrete Fourier Transform), Wavelet transform and Kalman filter [1,[7][8][9][10][11][12][13][14][15].…”

Iot Enabled Indoor Navigation System Design for Emergencies

“…Measurement with ultrasonic waves can achieve millimeter accuracy with a range of 6m. Unfortunately, undesirable phenomena can affect ultrasonic waves such as crosstalk, echo, and jamming (Medina, C. et al, 2013, De Angelis, G. et al, 2015 Large bandwidth signals allow transmission of short duration high energy pulses. Since it is possible to sense pulses as high as 20 times in a second, TOF and time of arrival positioning techniques can be applied.…”