Analysis and Design of Radio Communication Systems for Surfaced Sensor Networks

2015 ◽  
Author(s):  
Jacob Palmer ◽  
Elizabeth Basha ◽  
Jacob Greenwood ◽  
Carrick Detweiler
Keyword(s):  
Sensor Networks ◽  
Communication Systems ◽  
Radio Communication ◽  
Analysis And Design

High-Fidelity and Compact Modeling for Bone Conduction Communication Systems

2009 ◽  
Author(s):  
Andrzej Przekwas ◽  
Xianlian Zhou ◽  
X. G. Tan ◽  
Z. J. Chen ◽  
Debbie Reeves ◽  
...  
Keyword(s):  
Communication Systems ◽  
Situational Awareness ◽  
Bone Conduction ◽  
Cranial Bone ◽  
Compact Modeling ◽  
Hearing Protection ◽  
Anatomical Location ◽  
Radio Communication ◽  
Modeling Tools ◽  
Analysis And Design

Bone conduction (BC) hearing is the process of transmitting sound energy through vibrations of the skull, cerebrospinal fluid (CSF) and brain, which results in an auditory sensation (Stenfelt and Goode 2005). BC communication is attractive for military operations because the transducers are lightweight, inconspicuous, and easily integrated into military headgear. Bone conduction (BC) headsets can present audio when ambient sounds must be either blocked by hearing protection or preserved to maintain situational awareness, and they can provide necessary radio communication in quiet and high noise environments, especially when combined with an appropriate hearing protection system (McBride et al. 2005, Henry and Letowski, 2007). The overall objective of this research is to develop, validate, and deliver anatomy and physics based modeling tools and experimental procedures for analysis and design of cranial bone conduction (BC) communication systems. The modeling tools will be used to optimize the design, attachment, and anatomical location of BC speakers and microphones for best communication clarity in various military environments.

scholarly journals Influence of Aircraft Power Electronics Processing on Backup VHF Radio Systems

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 777
Author(s):  
Jan Leuchter ◽  
Radim Bloudicek ◽  
Jan Boril ◽  
Josef Bajer ◽  
Erik Blasch
Keyword(s):  
Power Electronics ◽  
Electromagnetic Interference ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Intermediate Frequency ◽  
Radio Communication ◽  
Very High Frequency ◽  
Switching Power ◽  
Radio Systems ◽  
The Impact

The paper describes the influence of power electronics, energy processing, and emergency radio systems (ERS) immunity testing on onboard aircraft equipment and ground stations providing air traffic services. The implementation of next-generation power electronics introduces potential hazards for the safety and reliability of aircraft systems, especially the interferences from power electronics with high-power processing. The paper focuses on clearly identifying, experimentally verifying, and quantifiably measuring the effects of power electronics processing using switching modes versus the electromagnetic compatibility (EMC) of emergency radio systems with electromagnetic interference (EMI). EMI can be very critical when switching power radios utilize backup receivers, which are used as aircraft backup systems or airport last-resort systems. The switching power electronics process produces interfering electromagnetic energy to create problems with onboard aircraft radios or instrument landing system (ILS) avionics services. Analyses demonstrate significant threats and risks resulting from interferences between radio and power electronics in airborne systems. Results demonstrate the impact of interferences on intermediate-frequency processing, namely, for very high frequency (VHF) radios. The paper also describes the methodology of testing radio immunity against both weak and strong signals in accordance with recent aviation standards and guidance for military radio communication systems in the VHF band.

scholarly journals Implementation of the asynchronous signals reception method with the direct sequence spread spectrum

2020 ◽  
Vol 30 (2) ◽  
pp. 49-54
Author(s):  
I. V. Egorov ◽  
D. V. Gaivoronskii
Keyword(s):  
Spread Spectrum ◽  
Communication Systems ◽  
Block Diagram ◽  
Random Sequence ◽  
Direct Sequence Spread Spectrum ◽  
Practical Implementation ◽  
Direct Sequence ◽  
Radio Communication ◽  
Radio Stations ◽  
Synchronization Mechanisms

The physical and logical organization of most existing communication systems provides for additional options (transmission of known preambles, the presence of an additional synchronization channel) that simplify synchronization. At the same time, in the practical implementation of radio communication systems, it is necessary to solve the problems of developing additional synchronization mechanisms that can reduce the time it takes to synchronize to reduce energy consumption and increase channel capacity. Thus, the existing problem of the asynchrony of the generators of physically remote radio stations is relevant. One of the possible solutions is asynchronous signal reception with the direct sequence spread spectrum. It allows converting the original binary signal into a pseudo-random sequence for modulating the carrier. The current article is devoted to the characterization of this method and has the following items presented: the transmitter and receiver block diagram, sufficient to explain the proposed method; methods for compensating for effects arising from the asynchrony of the transmitter and receiver generators. Since synchronization is generated according to the correlation peaks that correspond to the data bits, it is possible to set the frequency of the chips on the transmitter to jitter artificially and supplement the pseudo-random sequence with several random chips, which complicates the unauthorized detection of the transmitted signal.

scholarly journals Link Quality Assessment Algorithm for Heterogeneous Self-organizing Maritime Communications Network

2018 ◽  
Vol 2 ◽  
pp. 32-40
Author(s):  
Krzysztof Bronk ◽  
Adam Lipka ◽  
Rafał Niski
Keyword(s):  
Quality Assessment ◽  
Cellular Networks ◽  
Communication Systems ◽  
Measurement Data ◽  
Link Quality ◽  
Radio Link ◽  
Radio Communication ◽  
Communications Network ◽  
Link Quality Indicator ◽  
Sea Area

The article introduces a method of performing a radio link quality assessment based on the Link Quality Indicator (LQI) which will be calculated for every system that is available. The method presented has been developed during the netBaltic project completed in Poland and generally applies to the so-called maritime zone A, i.e. the sea area where ships are still within the range of shore-based radio communication systems, particularly 3G/LTE cellular networks. The algorithm was developed based on the results of measurements obtained during two separate campaigns. That measurement data served as a basis for the method’s initial assumptions and was utilized during the method’s verification.

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