Phase-Based Algorithm for Estimation of Time Delay Difference in Ultrasonic Flow Meters With Frequency Modulated Signals

Ronkin, Mikhail; Калмыков, А. А.

doi:10.1109/usbereit.2019.8736663

Cited by 1 publication

(1 citation statement)

References 4 publications

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“…Additionally, the use of a hybrid time-frequency domain and biologically inspired models was investigated for measurement in the range of 100-1000 mm. Ronkin et al [36] introduced a novel approach for FMCW-based TOF estimators relying on a heterodyne scheme, which showed improved performances over the above-reported processing algorithms. Efforts have also been made to make ultrasonic FMCW-based systems highly portable, light, and based on low-power hardware (see, for instance, Berkol et al [37] or De Angelis et al [38]) and to combine the ultrasound ranging with infrared technology to improve the overall accuracy [39] in the range of 50-1000 mm and 500-1400 mm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Modified FMCW Scheme for Improved Ultrasonic Positioning and Ranging of Unmanned Ground Vehicles at Distances < 50 mm

Laureti

Mercuri

Hutchins

et al. 2022

Sensors

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Unmanned ground vehicles (UGVs) find extensive use in various applications, including that within industrial environments. Efforts have been made to develop cheap, portable, and light-ranging/positioning systems to accurately locate their absolute/relative position and to automatically avoid potential obstacles and/or collisions with other drones. To this aim, a promising solution is the use of ultrasonic systems, which can be set up on UGVs and can potentially output a precise reconstruction of the drone’s surroundings. In this framework, a so-called frequency-modulated continuous wave (FMCW) scheme is widely employed as a distance estimator. However, this technique suffers from low repeatability and accuracy at ranges of less than 50 mm when used in combination with low-resource hardware and commercial narrowband transducers, which is a distance range of the utmost importance to avoid potential collisions and/or imaging UGV surroundings. We hereby propose a modified FMCW-based scheme using an ad hoc time-shift of the reference signal. This was shown to improve performance at ranges below 50 mm while leaving the signal unaltered at greater distances. The capabilities of the modified FMCW were evaluated numerically and experimentally. A dramatic enhancement in performance was found for the proposed FMCW with respect to its standard counterpart, which is very close to that of the correlation approach. This work paves the way for the future use of FMCWs in applications requiring high precision.

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