Utilizing orthogonal coprime signals for improving broadband acoustic Doppler current profilers

C Chi, H Vishnu, KT Beng… - IEEE Journal of Oceanic …, 2019 - ieeexplore.ieee.org
Broadband acoustic Doppler current profilers (BBADCPs) are instruments that are widely
used for measuring ocean currents. The ambiguity velocity of the conventional method used …

Improved velocity estimation method for Doppler sonar based on accuracy evaluation and selection

Y Yang, S Fang - Journal of Marine Science and Engineering, 2021 - mdpi.com
The matched filtering method and the waveform-tracking method cannot maintain optimal
velocity estimation performance all of the time. In order to solve this problem, this paper …

Mitigation method of acoustic doppler velocity measurement bias

X Li, D Sun, Z Cao - Ocean Engineering, 2024 - Elsevier
A Doppler velocity log (DVL) is used to estimate ship's velocity by processing seafloor echo.
The velocity measurement bias (ie, long term accuracy) is often regarded as an important …

Strong scattering targets separation based on fractional Fourier transformation in pulse-to-pulse coherent acoustical Doppler current profilers

J Cui, Z Li, Q Li - IEEE Journal of Oceanic Engineering, 2018 - ieeexplore.ieee.org
The influence of the strong scattering targets (SSTs) on the flow cell velocities, ie, the fish-
bias effect, is a common phenomenon existing widely in real-time measurements of ocean …

Robust resolution of velocity ambiguity for multifrequency pulse-to-pulse coherent Doppler sonars

C Chi, H Vishnu, KT Beng… - IEEE Journal of Oceanic …, 2019 - ieeexplore.ieee.org
Pulse-to-pulse coherent Doppler sonars are widely used to explore boundary layer
characteristics of oceans. Multifrequency pulse-to-pulse coherent Doppler sonars have been …

Robust Chinese Remainder Theorem–Based Synthetic Aperture Sonar Motion Estimation

C Chi, S Chen, R Zhong, P Zhang… - IEEE Journal of …, 2024 - ieeexplore.ieee.org
Motion estimation is required to obtain high imaging quality in synthetic aperture sonars
(SASs). Displaced phase center antenna (DPCA) micronavigation is an important technique …

Estimating AUV Motion Using a Dual-Sided Synthetic Aperture Sonar

S Chen, C Chi, P Zhang, P Wang, R Hu… - IEEE Journal of …, 2023 - ieeexplore.ieee.org
The navigation and localization of autonomous underwater vehicles (AUVs) in complex
underwater environments are challenging. Synthetic aperture sonar (SAS) can provide a …

[PDF][PDF] 浅水域的高频宽带ADCP 系统

李佳润, 陈世利 - 电子测量与仪器学报, 2023 - jemi.cnjournals.com
浅水域测流可以促进防洪灌溉等水利工程的发展. 宽带多普勒剖面流速仪(acoustic Doppler
current profiler, ADCP) 可以精确监测水域的流层流速信息. 应用于浅水域测流的宽带ADCP …

Suppressing interference from sidelobe coupling in phased-array acoustic Doppler velocimetry based on correlation delay optimization

D Li, Z Cao - Remote Sensing Letters, 2024 - Taylor & Francis
Velocity information is important for describing the motion state of an object. Modern
underwater navigation systems use the Doppler effect to extract the absolute velocity to the …

Improving broadband acoustic Doppler current profiler with orthogonal coprime pulse pairs and robust Chinese remainder theorem

C Chi, H Vishnu, KT Beng - 2018 OCEANS-MTS/IEEE Kobe …, 2018 - ieeexplore.ieee.org
Broadband acoustic Doppler current profilers (ADCPs) are instruments that are widely used
in underwater observation. However, conventional broadband ADCPs face the problem of …