Research on Acquisition Performance of FFT Algorithm for Low-Frequency Spread-Spectrum Signals Using Acoustic Sensors

Yongzhuang Tang, Qidou Zhou, Zhiyong Xie, Wenxi Liu and Xiaojun Lü ()
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Yongzhuang Tang: College of Naval Architecture and Ocean Engineering, Naval University of Engineering, 717 JieFang Road, Wuhan 430033, China
Qidou Zhou: Ship Science Department, Naval University of Engineering, 739 JieFang Road, Wuhan 430033, China
Zhiyong Xie: College of Naval Architecture and Ocean Engineering, Naval University of Engineering, 717 JieFang Road, Wuhan 430033, China
Wenxi Liu: College of Naval Architecture and Ocean Engineering, Naval University of Engineering, 717 JieFang Road, Wuhan 430033, China
Xiaojun Lü: College of Naval Architecture and Ocean Engineering, Naval University of Engineering, 717 JieFang Road, Wuhan 430033, China

Sustainability, 2023, vol. 15, issue 8, 1-15

Abstract: An essential precondition for the effective use of low-frequency spread-spectrum acoustic signals is their synchronous acquisition. Due to the low bit rate that low-frequency spread-spectrum signals have, the length of the spreading spectrum code and the number of intra-chip carriers need to be precisely designed to balance the acquisition performance and the bit rate in low-frequency spread-spectrum signals. Furthermore, the selection of the acquisition method and sampling frequency depends on the specific application and system requirements, which will directly affect the processing speed and accuracy. Firstly, this study uses a cyclical stepping search combined with a fixed threshold and maximum correlation discriminant method to improve the FFT acquisition algorithm with a low Doppler frequency. Secondly, the effects of the spreading spectrum code parameters and sampling frequency on the acquisition performance are also investigated through simulation and experiments with acoustic sensors. The results show that both lengthening the spreading spectrum code and increasing the number of intra-chip carriers can greatly improve the acquisition performance. Increasing the sampling frequency can improve the ranging accuracy but has a very limited improvement effect on the acquisition performance.

Keywords: acoustic sensors; low-frequency spread-spectrum acoustic signals; FFT acquisition algorithm; the number of intra-chip carriers; the length of spreading spectrum code (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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