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Related Concept Videos

Transformers with Off-Nominal Turns Ratios01:25

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In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
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An RC circuit consists of resistance and capacitance, while in an RL circuit, capacitance is replaced by an inductor. RL and RC circuits are first-order differential circuits that store energy. An RC circuit stores energy in the electric field, while an RL circuit stores energy in the magnetic field. When connected to a battery, an RC circuit charges the capacitor, causing the current to decrease from maximum to zero upon being fully charged. This increases the voltage across the capacitor from...
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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Clipper Circuit01:18

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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
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In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
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Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
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Learning transformer network for effective radar chaff jamming suppression.

Shuolei Li1, Junli Zhu1, Jingping Liu2

  • 1School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.

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Summary

This study introduces a transformer network to suppress radar chaff jamming, significantly improving signal quality. The novel approach enhances radar

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Artificial Intelligence

Background:

  • Chaff jamming poses a significant challenge to radar systems.
  • Effective suppression of chaff jamming is crucial for maintaining radar performance.

Purpose of the Study:

  • To propose an effective transformer network for suppressing radar chaff jamming.
  • To improve the anti-chaff jamming capabilities of radar systems.

Main Methods:

  • Utilizing a transformer network with a scaled dot-product multi-head self-attention mechanism.
  • Modeling non-local information for radar echo signal reconstruction.
  • Establishing a diverse dataset of measured chaff radar echo signals.

Main Results:

  • Achieved a mean square error of 0.0258.
  • Reached a correlation coefficient of 93.26%.
  • Improved signal-to-noise ratio by 11.1475 dB.

Conclusions:

  • The proposed transformer network effectively suppresses chaff jamming.
  • The method establishes a new benchmark for radar chaff jamming suppression.
  • The developed dataset is a valuable resource for future research.