Coded Ultrasonic Ranging for the Distance Measurement of Coaxial Rotor Blades

Lu, Y ORCID: 0000-0002-7740-800X, Qiu, Z ORCID: 0000-0002-6219-7158, Zhang, S ORCID: 0009-0008-4821-7352, Hu, W, Qiu, Y ORCID: 0000-0003-0266-1294 and Qiu, Z (2025) Coded Ultrasonic Ranging for the Distance Measurement of Coaxial Rotor Blades. Micromachines, 16 (2).

Preview

Text micromachines-16-00240-v2.pdf - Published Version Available under License Creative Commons Attribution. Download (7MB) | Preview

Abstract

Coaxial rotor helicopters have a wide range of civilian and military applications; however, the collision risk of the upper and lower blades that comes with the coaxial rotor system remains. This paper introduces a blade-tip distance measurement method based on coded ultrasonic ranging to tackle this challenge. Coded ultrasonic ranging with phase modulation was adopted to improve the measurement rate. In this paper, seven-bit M-sequences and Gold codes are chosen with four periods of 200 kHz sine wave carriers as the excitation signals, and the received signals are filtered by a bandpass filter and decoded by a matching filter. The coding performance is evaluated by the distinguishability and energy level of the received signals. The experimental results show that the measurement rate can reach 3060 Hz for a distance of one meter. They also give the potential solution for other high-speed measurement problems.

Item Type:	Article
Uncontrolled Keywords:	1007 Nanotechnology; 4018 Nanotechnology
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Engineering
Publisher:	MDPI
Date of acceptance:	17 February 2025
Date of first compliant Open Access:	20 February 2025
Date Deposited:	20 Feb 2025 12:16
Last Modified:	03 Jul 2025 15:15
DOI or ID number:	10.3390/mi16020240
URI:	https://researchonline.ljmu.ac.uk/id/eprint/25688

View Item