Related Experiment Video
Updated: Jan 29, 2026
09:01
Handling and Tagging Techniques for Implanting Juvenile American Shad with a New Acoustic Microtransmitter
Published on: June 14, 2024
2.9K
Passive underwater acoustic tags using layered media.
Aprameya Satish1, Brendan Nichols1, David Trivett1
1School of Mechanical Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0405, USAaprameya.satish@gatech.edu, bnichols8@gatech.edu, david.trivett@me.gatech.edu, karim.sabra@me.gatech.edu.
The Journal of the Acoustical Society of America
|February 4, 2019
Summary
This study introduces a passive underwater marker for Autonomous Underwater Vehicle (AUV) navigation. This cost-effective marker uses acoustic backscattering for AUV positioning, offering a simpler alternative to active transponders.
Area of Science:
- Marine Robotics and Navigation
- Acoustic Signal Processing
- Ocean Engineering
Background:
- Autonomous Underwater Vehicle (AUV) navigation relies heavily on precise environmental positioning.
- Current methods often utilize active acoustic transponders, which are complex, expensive, and require significant maintenance and power.
Purpose of the Study:
- To present a novel, passive underwater marker system for AUV navigation.
- To offer a cost-effective and low-maintenance alternative to existing acoustic navigation aids.
Main Methods:
- Development of a passive marker constructed from horizontally stacked, acoustically reflective materials.
- Detection of the marker's unique acoustic signature via acoustic backscattering when insonified by the AUV.
Main Results:
- Demonstrated the feasibility of using a passive marker for AUV navigation.
- The proposed marker is cost-effective and requires simpler servicing compared to active systems.
Conclusions:
- Passive acoustic markers represent a viable and economical solution for AUV positioning.
- This technology simplifies underwater navigation system requirements, reducing operational costs and complexity.
Related Concept Videos
01:27Passive Filters
1.0K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
1.0K
01:31Active versus Passive Immunity
10.7K
Immunity, along with the ability to limit pathogen growth to prevent significant body tissue damage, can be gained either by (1) actively developing an immune response within the individual after exposure to a pathogen or after getting vaccinated or (2) passively transferring immune components from an immune individual to one who is nonimmune. Both these forms of immunity can be found naturally and in medical practices.
Active Immunity
Active immunity refers to the resistance one develops...
Active Immunity
Active immunity refers to the resistance one develops...
10.7K
01:17Passive Diffusion: Overview and Kinetics
1.4K
Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
1.4K
01:27Microbial Growth Media
1.8K
Microbial growth media are essential tools in microbiology, providing the nutrients and conditions necessary to cultivate and study microorganisms. These media are categorized by their composition, consistency, and functional roles, enabling researchers to investigate microbial physiology, behavior, and interactions.Types and Consistencies of Growth MediaGrowth media can be solid, liquid, or semisolid. Solid media, often agar-based, allow visible colony growth for isolation and enumeration.
1.8K
01:21Layers of the Epidermis
8.1K
The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
8.1K
01:24Tagging and Fusion Proteins
8.5K
Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
8.5K