A5079201000- Underwater Acoustics Research
- Speech and Audio Processing
- Underwater Vehicles and Communication Systems
- Marine animal studies overview
- Direction-of-Arrival Estimation Techniques
- Optical measurement and interference techniques
- Geophysics and Sensor Technology
- Advanced MEMS and NEMS Technologies
- Non-Invasive Vital Sign Monitoring
- Advanced Fiber Optic Sensors
- Gait Recognition and Analysis
- Blind Source Separation Techniques
- Flow Measurement and Analysis
- Acoustic Wave Phenomena Research
North University of China
2021-2024
The main frequency band of the radiated signals from ships is 20-500Hz, and also working Micro-Electro-Mechanical-System ( MEMS ) vector hydrophone. To improve sensitivity in this band, paper presents a nested package structure, which encapsulates sensitive sections hydrophone with mesh-like interior support sound-transparent cap. By COMSOL Multiphysics 6.0 simulation, particle acceleration intrinsic different supports cap are compared analyzed. simulation results show that encapsulated...
Ship noise observation is of great significance to marine environment research and national defense security. Acoustic stealth technology makes a variety ship significantly reduced, which new challenge for monitoring. However, there are few high spatial gain detection methods low-noise Therefore, Signal-to-Noise Ratio (SNR) MEMS listener developed in this paper. The achieves considerable by suppressing isotropic the ocean. working principle posterior end signal processing method introduced...
Vector hydrophone is the core equipment of underwater acoustic detection. Aiming at problem low sensitivity and short detection distance existing vector hydrophone. In this paper, a hollow mushroom-like cilia sensitive structure designed to optimize unit. The optimal size MEMS (MCVH) microstructure was determined by COMSOL5.6 simulation. adopted, which not only ensures working bandwidth 20Hz-1000Hz, but also improves increasing receiving area sound wave. test results show that has obvious...
The complex and variable ocean environment introduces noise to the signal received by microelectromechanical systems (MEMSs) vector hydrophones, which seriously affects target location. To improve detection efficiency broaden application range of this article proposed a novel modified wavelet packet (WP) de-noising method, known as WP energy (WPE) method. This method utilizes Shannon entropy determine optimal decomposition levels WPs calculates reconstructed signals in each frequency band...
Single MEMS vector hydrophone orientation measurement methods can be divided into two categories: continuous wave method and pulse method. Although the is more stable , when sinusoidal signal used as a source, some errors will introduced due to influence of reflected wave. If source replaced by signal, environmental on suppressed, accuracy target DOA estimation better than that wave, further improved segmenting extracting effective signal. This paper introduces principle based experiment...
With the rapid development and wide application of Micro-Electro-Mechanical System (MEMS) vector hydrophones, it is higher requirement for estimation method direction arrival (DOA) a single hydrophone in complex environments. Although many classical methods DOA have been proposed this field, environments, such as multipath effects reverberation, still needs to be further studied. When target estimated environment with reflected waves, certain errors will caused due reflection provided that...