The magnetic antenna can receive extremely weak underwater magnetic signals, and induce the magnetic field intensity which can reach the femto-tesla (fT) level, making it widely used in underwater electromagnetic signal detection. However, even the slightest vibration in the environment transmitted to the antenna will make it cut the geomagnetic field movement; as a result, electromagnetic-induced noise would be generated, and affect the performance of the magnetic antenna. The best method to suppress the motion induced noise is to isolate the magnetic antenna effectively from the ambient vibration. In this paper, the vibration reduction requirements of magnetic antenna are identified, and the principle of vibration absorber system of the magnetic antenna model is established. A magnetic antenna damping system, mainly focusing on low frequency, is proposed by using a silicon rubber elastic element. Based on the proposed method, a magnetic antenna damping system with an attenuation rate up to 100 times is designed, and some performance experiments are scheduled. The experiment results show that the performance of the magnetic antenna damping system meets the design requirements.

/pdf/design-and-experiment-of-magnetic-antenna-vibration-and-2ckopuac.pdf

Design and Experiment of Magnetic Antenna Vibration and Noise Reduction System

Electrode-pair towed antennas are widely utilized for marine electromagnetic detection, underwater communication, and other purposes. However, the motion-induced noise created by antenna vibrations due to environmental turbulence affects extremely low frequency and super low frequency (ELF/SLF) communications. In this article, we presented a method for detecting the motion-induced noise of electrode-pair towed antennas using helix coil sensors. The equivalent resistance, inductance, capacitance, and conductance (RLCG) transmission model and parameters were derived based on the mirror method of the twisted structure with a shielding layer inside. A water-flow cycling experimental platform was constructed to evaluate two types of antenna sections. Electrode-pair, accelerators, and helix coils sensors signals were sampled and analyzed in time and frequency domain. The comparison results demonstrated that the helix coil sensors achieved a high correlation with the electrode-pair towed antenna in various vibration speeds ranging from 0.7 to 0.9.

/pdf/motion-induced-noise-detection-of-electrode-pair-towed-2gr2q687.pdf

Motion-Induced Noise Detection of Electrode-Pair Towed Antennas Using Helix Coil Sensors

Motion-induced noise is the main noise that limits extremely low-frequency (ELF) communication for both shore-based and deep-sea submarines. This article starts from the generation mechanism of motion-induced noise in magnetic antennas, and focuses on the causes of motion-induced noise in magnetic antennas on fixed platforms. The theoretical conclusion reveals that the vibration of magnetic antennas will induce their internal motion-induced noise in either differential or integral form, indicating a clear linear relationship between the vibration and motion-induced noise of magnetic antennas. Based on the generated principle of motion-induced noise presented in this article, corresponding noise reduction algorithms are proposed, and an effective way to apply adaptive filtering algorithm in motion-induced noise cancellation is also presented to accurately reduce this type of noise. In different types of experiments on motion-induced noise testing, the noise reduction results obtained by different noise reduction algorithms demonstrate that the method proposed in this article can achieve effective cancellation of motion-induced noise in magnetic antennas. This experimental result further confirms the research conclusions in this article and provides a feasible approach for practical motion-induced noise cancellation.

Motion-Induced Noise Mechanism Analysis and Reduction Algorithm of ELF Magnetic Receiving Antennas

Motion-induced noise is the main noise that limits extremely low-frequency communication for both shore-based and deep-sea submarines. This manuscript starts from the generation mechanism of motion-induced noise in magnetic antennas, and focuses on the causes of motion-induced noise in magnetic antennas on fixed platforms. The theoretical conclusion reveals that the vibration of magnetic antennas will induce their internal motion-induced noise in either differential or integral form, indicating a clear linear relationship between the vibration and motion-induced noise of magnetic antennas. Based on the generated principle of motion-induced noise presented in this manuscript, corresponding noise reduction algorithms are proposed, and an effective way to apply adaptive filtering algorithm in motion-induced noise cancellation is also presented to accurately reduce this type of noise. In different types of experiments on motion-induced noise testing, the noise reduction results obtained by different noise reduction algorithms demonstrate that the method proposed in this manuscript can achieve effective cancellation of motion-induced noise in magnetic antennas. This experimental result further confirms the research conclusions in this manuscript and provides a feasible approach for practical motion-induced noise cancellation. 

Novel modular quasi-zero stiffness vibration isolator with high linearity and integrated fluid damping

The extremely low frequency magnetic antennas are widely used in geophysical exploration, marine electromagnetic detection, and other applications. However, the slight vibration of the antenna platform will cause extra antenna electromagnetic noise. In this letter, the electromagnetic noise of the magnetic antenna caused by vibration is simulated under different vibration conditions first. Then, in order to evaluate the effect of vibration on magnetic antenna performance, some vibration-induced noise measurement experiments of magnetic antenna were carried on. Experiment results show that vibration-induced noise is one of the main sources of antenna electromagnetic noise, but with proper vibration isolation technology, the vibration-induced noise can be reduced to the level of ambient electromagnetic noise.

Vibration-Induced Noise in Extremely Low Frequency Magnetic Receiving Antennas

It analyses the composition and principle of high-sensitive wide-band magnetic-feedback inductive magnetic sensor to fulfil the demand of high-sensitive wide-band magnetic sensor in geological exploration. It studies main factors to the performance of wide-band magnetic sensor, such as turns of coils, core material features, and amplifier noise, specifies section-wise coil winding, the type and dimension of core material, and designs low-noise high-impedance LF chopping amplifier channel and composite amplifier with HF amplifier channel. The noise of magnetic sensor at 1 Hz is better than 10-4nT/Hz1/2, at 100Hz-1kHz band the noise floor is close to SQUID which can reach 10-6nT/Hz1/2. The magnetic sensor works at wide frequency band (0.0001Hz-10kHz) and ultra-low noise, which can meet the requirements of both AMT and CSAMT.

/pdf/study-on-the-technology-of-ultra-high-sensitive-wide-band-3x2m4w4dk8.pdf

Study on the Technology of Ultra-high Sensitive Wide-band Magnetic-feedback Inductive Magnetic Sensor

Popular Tasks used by Researchers

How can I help with your research?

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

We encountered an error while loading the panel. Please try refreshing the page.

Something went wrong

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

Anyone with the link can view this chat. You can switch it back to private anytime.

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Rui Xu

Author Tools

Chat about Author

Papers

Vibration-Induced Noise in Extremely Low Frequency Magnetic Receiving Antennas

Study on the Technology of Ultra-high Sensitive Wide-band Magnetic-feedback Inductive Magnetic Sensor