Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
Sampling Methods: Overview01:06

Sampling Methods: Overview

A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of sampling...
Distance Measurements by Taping01:18

Distance Measurements by Taping

Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length, the...
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Defective PdMo metallene with efficient catalase-like activity for sensitive immunoassay.

Analytica chimica acta·2026
Same author

Integrated single cell and spatial transcriptomics reveals the cellular and molecular mechanisms underlying UCMSCs treatment of ovarian aging in tree shrews.

Stem cell research & therapy·2026
Same author

Early Identification of Differentiation Syndrome During ATRA and Arsenic Therapy in Pediatric NHR-APL: Insights From a 14-Year Multicenter Cohort.

Pharmacoepidemiology and drug safety·2026
Same author

Integration of Boruta algorithm and latent class analysis for risk factors of 30-day mortality in pediatric hemophagocytic lymphohistiocytosis based on peripheral blood indicators.

Frontiers in pediatrics·2026
Same author

Comprehensive Proteomic Profiling Reveals Molecular Mechanisms Mediating Chemoradiotherapy Efficacy in Lung Cancer.

Journal of proteome research·2026
Same author

Continuous forecasting of range-dependent ocean sound speed field: Diffusion model meets multi-output Gaussian process.

The Journal of the Acoustical Society of America·2026
Same journal

Interaction of near-wall bubble arrays with acoustic waves induced by an oscillating rigid wall.

The Journal of the Acoustical Society of America·2026
Same journal

Ultra-broadband underwater acoustic projector based on transverse resonance orthogonal beam (TROB) mode and acoustic matching layer technique.

The Journal of the Acoustical Society of America·2026
Same journal

Fine-scale quantitative analysis of bowhead whale (Balaena mysticetus) song shows varying stability of song types.

The Journal of the Acoustical Society of America·2026
Same journal

High-resolution depth estimation for multiple wideband sources in deep sea via sparse Bayesian learninga).

The Journal of the Acoustical Society of America·2026
Same journal

Depression markers in speech: An approach based on tract variables dynamics.

The Journal of the Acoustical Society of America·2026
Same journal

The oyster toadfish (Opsanus tau) alters active and diurnal calling amid vessel noise in New York City.

The Journal of the Acoustical Society of America·2026
See all related articles

Related Experiment Video

Updated: May 29, 2026

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Periodic extension phase unwrapping for direction-of-arrival estimation using sparse undersampled arrays: Method and

Wei Ma1, Chuan Tian2, Chengcai Lyu2

  • 1College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

The Journal of the Acoustical Society of America
|May 28, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces Periodic Extension Phase Unwrapping (PEPU) to solve spatial aliasing and phase ambiguity in underwater acoustic arrays. PEPU enhances direction-of-arrival estimation accuracy for sparse arrays in challenging marine environments.

More Related Videos

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
06:14

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Related Experiment Videos

Last Updated: May 29, 2026

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
06:14

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Underwater acoustic arrays face challenges with spatial aliasing and phase ambiguity.
  • Sparse and undersampled arrays exacerbate these issues in direction-of-arrival (DOA) estimation.
  • Existing methods struggle with broadband signals and complex acoustic environments.

Purpose of the Study:

  • To develop a robust phase unwrapping method for broadband DOA estimation.
  • To address spatial aliasing and phase ambiguity in sparse underwater acoustic arrays.
  • To improve the stability and accuracy of DOA estimation in challenging conditions.

Main Methods:

  • Periodic Extension Phase Unwrapping (PEPU) is proposed.
  • Extends wrapped cross-spectral phase to create a candidate phase space.
  • Utilizes local phase smoothness and cross-frequency continuity for dominant trajectory extraction.
  • Employs global trajectory screening to suppress anomalies.

Main Results:

  • PEPU effectively suppresses anomalies from multipath propagation and interference.
  • Demonstrates improved stability in broadband phase unwrapping for large-spacing arrays.
  • Provides reliable phase input for ambiguity-free DOA estimation.
  • Validated through sea trials in the South China Sea.

Conclusions:

  • PEPU offers a stable and reliable solution for phase unwrapping in sparse underwater acoustic arrays.
  • Enhances the accuracy of broadband DOA estimation in complex acoustic environments.
  • Reduces the impact of anomalous frequency bins and nonstationary disturbances.