Accurate distance measurement by an autonomous ultrasonic system combining time-of-flight and phase-shift methods

Gueuning, F.; Varlan, M.; Eugène, Christian; Dupuis, Pascal

doi:10.1109/imtc.1996.507414

Cited by 75 publications

(31 citation statements)

References 3 publications

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“…First fairly accurate work was done in 1997 [15] and deals with accurate ultrasonic distance measurement by combining time-of-flight and phase shift methods. Final accuracy was ±1 mm on 1 m propagation path.…”

Section: Papers Dealing With Precise Ultrasonic Measurementsmentioning

confidence: 99%

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

Ondraczka

2017

2017 International Conference on Applied Electronics (AE)

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This paper presents an ultrasonic thermometry state of the art study and shows principle of the ultrasonic thermometry through experiments with an ultrasonic thermometer prototype. The study covers a brief ultrasonic temperature measurement research history and focuses on recent revelations in this field. The thermometer prototype is constructed to be portable and usable for educational presentations. Its principle, performance and ultrasonic temperature measurements results are described in the experimental part. Keywords-ultrasonic thermometry; air temperature measurement; time of flight; ultrasonic thermometer;I.

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Section: Papers Dealing With Precise Ultrasonic Measurementsmentioning

confidence: 99%

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

Ondraczka

2017

2017 International Conference on Applied Electronics (AE)

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“…The estimation error in determining the envelope maximum is reduced by applying parabolic interpolation considering the adjacent samples around the selected peak [24]. The TOF measurement is calculated as

TOF = \frac{n_{max} + n_{x}}{F_{s}}

where n x is the fractional correction term obtained from parabolic interpolation.…”

Section: Ultrasonic Tof Estimationmentioning

confidence: 99%

Ultrasound Indoor Positioning System Based on a Low-Power Wireless Sensor Network Providing Sub-Centimeter Accuracy

Medina

Segura

Torre

2013

Sensors

147

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This paper describes the TELIAMADE system, a new indoor positioning system based on time-of-flight (TOF) of ultrasonic signal to estimate the distance between a receiver node and a transmitter node. TELIAMADE system consists of a set of wireless nodes equipped with a radio module for communication and a module for the transmission and reception of ultrasound. The access to the ultrasonic channel is managed by applying a synchronization algorithm based on a time-division multiplexing (TDMA) scheme. The ultrasonic signal is transmitted using a carrier frequency of 40 kHz and the TOF measurement is estimated by applying a quadrature detector to the signal obtained at the A/D converter output. Low sampling frequencies of 17.78 kHz or even 12.31 kHz are possible using quadrature sampling in order to optimize memory requirements and to reduce the computational cost in signal processing. The distance is calculated from the TOF taking into account the speed of sound. An excellent accuracy in the estimation of the TOF is achieved using parabolic interpolation to detect of maximum of the signal envelope at the matched filter output. The signal phase information is also used for enhancing the TOF measurement accuracy. Experimental results show a root mean square error (rmse) less than 2 mm and a standard deviation less than 0.3 mm for pseudorange measurements in the range of distances between 2 and 6 m. The system location accuracy is also evaluated by applying multilateration. A sub-centimeter location accuracy is achieved with an average rmse of 9.6 mm.

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“…These ultrasonic sensors are driven by PWM signals to perform pulse echo measurements. 6,7 The DSC measures the time between the transmitted ultrasonic burst and the received reflected pulse pattern. The distance can be calculated as:…”

Section: The Sensor Unit Sub Modulementioning

confidence: 99%

Teaching DSP in Digital Control

Bormann

2012

The International Journal of Electrical Engineering & Educa

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The paper describes an approach to introduce digital signal processors (DSPs) in teaching digital control for undergraduates in electrical engineering. The article focuses first on the increasing demand for computational power from new mathematical approaches to digital control techniques, such as digital power supply, digital motor control, photovoltaic inverters, inverters for solar arrays and LED illuminating. The challenge for educators is to provide both a basic understanding of hardware and software modules on processor technology and a reasonable mathematical background to the underlying theory. Over the last decade the author has developed a set of teaching modules based on the C2000 family of digital signal controllers. As an example of students' work, the paper also describes a project based on an autonomous driving car.

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Accurate distance measurement by an autonomous ultrasonic system combining time-of-flight and phase-shift methods

Cited by 75 publications

References 3 publications

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

Ultrasound Indoor Positioning System Based on a Low-Power Wireless Sensor Network Providing Sub-Centimeter Accuracy

Teaching DSP in Digital Control

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