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Related Concept Videos

Pulse01:16

Pulse

2.2K
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
2.2K
Pulse01:05

Pulse

4.2K
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
4.2K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.8K
Pulse Oximetry01:24

Pulse Oximetry

1.4K
Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
1.4K
Regulation of Pulse01:20

Regulation of Pulse

2.3K
Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
2.3K
Pulse rhythm01:30

Pulse rhythm

1.4K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.4K

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Ultrasound-based Pulse Wave Velocity Evaluation in Mice
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A Sparse-Driven Anti-Velocity Deception Jamming Strategy Based on Pulse-Doppler Radar with Random Pulse Initial

Zhen Liu1, Jinping Sui2, Zhenhua Wei3

  • 1College of Electronic Science, National University of Defense Technology, Changsha 410073, China. zhen_liu@nudt.edu.cn.

Sensors (Basel, Switzerland)
|April 20, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel anti-velocity jamming strategy for pulse-Doppler radar. It effectively detects real targets amidst digital radio frequency memory (DRFM) jamming by using random pulse initial phase (RPIP) signals.

Keywords:
anti-velocity false target jammingelectronic counter-countermeasurespulse diversityrandom pulse repetition interval

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Area of Science:

  • Radar signal processing
  • Electronic warfare
  • Target detection

Background:

  • Digital radio frequency memory (DRFM) repeat jammers pose a significant threat to pulse-Doppler (PD) radar systems.
  • Jamming can obscure true targets, hindering radar's ability to detect moving objects.

Purpose of the Study:

  • To develop an advanced anti-velocity jamming strategy for PD radar.
  • To enhance the detection of moving targets in the presence of sophisticated DRFM jamming.

Main Methods:

  • Utilizes random pulse initial phase (RPIP) signals to disrupt DRFM jammer adaptability.
  • Employs an entropy-based multi-channel processing scheme for signal information extraction.
  • Applies the short-time sparse recovery (STSR) algorithm for motion parameter estimation.

Main Results:

  • Successfully distinguishes true target echoes from false target jamming signals.
  • Identifies jamming components and DRFM jammer operating modes.
  • Recognizes both translational and micro-motion false target jamming.
  • Outperforms correlated processing (CP) methods in strong jamming environments.

Conclusions:

  • The proposed RPIP strategy effectively combats velocity jamming.
  • Enables robust detection and accurate motion parameter recovery of true targets.
  • Maintains performance even under severe jamming conditions.