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Related Concept Videos

Bus Impedance Matrix01:24

Bus Impedance Matrix

400
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
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Multimachine Stability01:25

Multimachine Stability

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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
359

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HDDM Hardware Evaluation for Robust Interference Mitigation.

Fabio Garzia1, Johannes Rossouw van der Merwe1, Alexander Rügamer1

  • 1Satellite-Based Positioning Systems Department, Fraunhofer IIS, Nordostpark 84, 90411 Nuremberg, Germany.

Sensors (Basel, Switzerland)
|November 18, 2020
PubMed
Summary
This summary is machine-generated.

Robust interference mitigation is crucial for Global Navigation Satellite System (GNSS) receivers. A new hardware implementation of the High-rate DFT-based Data Manipulator (HDDM) algorithm demonstrates effective performance against various interference types.

Keywords:
discrete Fourier transform (DFT)global navigation satellite system (GNSS)high-rate DFT-based data manipulator (HDDM)interferencemitigation

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Navigation Systems

Background:

  • Global Navigation Satellite System (GNSS) receivers are susceptible to performance degradation caused by signal interference.
  • Existing interference mitigation techniques often lack robustness and multi-purpose applicability for diverse interference scenarios.
  • Reliable GNSS operation necessitates advanced methods to counteract various forms of signal disruption.

Purpose of the Study:

  • To describe state-of-the-art interference mitigation techniques for GNSS receivers.
  • To propose and present a hardware implementation of the High-rate DFT-based Data Manipulator (HDDM) algorithm as a solution to current limitations.
  • To evaluate the performance, resource utilization, and power consumption of the HDDM hardware module in different receiver configurations.

Main Methods:

  • A hardware module of the HDDM algorithm was implemented.
  • The HDDM module was integrated into three distinct GNSS receivers with varying analog radio-frequency (RF) front-end dynamic ranges.
  • Performance was evaluated by comparing the HDDM-equipped receivers against low-end and high-end commercial receivers using diverse interference types, including frequency hopping and pulsed interference.

Main Results:

  • The hardware HDDM implementation achieved performance comparable or superior to existing state-of-the-art mitigation techniques.
  • The HDDM demonstrated enhanced effectiveness against more complex interference types, such as frequency hopping and pulsed signals.
  • Resource utilization and power consumption were evaluated across different receiver integrations, providing insights into hardware efficiency.

Conclusions:

  • The HDDM algorithm, particularly in its hardware implementation, offers a robust and effective solution for GNSS interference mitigation.
  • The HDDM shows significant advantages over conventional methods when dealing with challenging and complex interference environments.
  • The proposed hardware module provides a viable path towards improving the reliability and performance of GNSS receivers in adverse signal conditions.