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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
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Performance Evaluation of a Full-Duplex Relaying-Enabled Satellite Sensor Network.

Xigang Xia1, Bo Yang1, Zhiyu Liu1

  • 1JiLin JLU Communication Design Institute Co. Ltd., Jilin 130012, China.

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|December 15, 2019
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Summary
This summary is machine-generated.

This study analyzes full-duplex (FD) relaying in satellite sensor networks, considering interference. FD relaying significantly enhances performance compared to half-duplex systems.

Keywords:
ergodic capacityfull-duplexoutage probabilityresidual loop interferencesatellite sensor network

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Area of Science:

  • Wireless communication networks
  • Satellite communications
  • Sensor networks

Background:

  • Satellite sensor networks face challenges with simultaneous uplink and downlink transmissions.
  • Residual loop interference impacts network performance in full-duplex (FD) systems.

Purpose of the Study:

  • To investigate the performance of FD relaying-enabled satellite sensor networks under residual loop interference.
  • To derive closed-form expressions for outage probability and ergodic capacity.

Main Methods:

  • Mathematical derivation of performance metrics (outage probability, ergodic capacity).
  • Consideration of factors: residual loop interference, channel statistics, propagation loss, antenna patterns, and elevation angles.
  • Performance evaluation through simulations.

Main Results:

  • Closed-form expressions for outage probability and ergodic capacity were successfully derived.
  • FD relaying demonstrated significant performance gains over traditional half-duplex relaying.
  • Key system parameters were identified as having a notable impact on network performance.

Conclusions:

  • FD relaying is a promising technology for enhancing satellite sensor network performance.
  • Understanding and mitigating residual loop interference is crucial for optimal FD system design.
  • System parameters must be carefully considered to maximize the benefits of FD relaying in satellite networks.