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Lu, Y, Qiu, Z, Zhang, S, Hu, W, Qiu, Y and Qiu, Z (2025) Coded Ultrasonic Ranging for the Distance Measurement of Coaxial Rotor Blades. Micromachines, 16 (2).
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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 |
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| Uncontrolled Keywords: | 1007 Nanotechnology; 4018 Nanotechnology |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Engineering |
| Publisher: | MDPI |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 20 Feb 2025 12:16 |
| Last Modified: | 20 Feb 2025 12:16 |
| DOI or ID number: | 10.3390/mi16020240 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/25688 |
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