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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

4.1K
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...
4.1K
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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Related Experiment Video

Updated: Feb 7, 2026

Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
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Clutter and Range Ambiguity Suppression Using Diverse Pulse Train in Pulse Doppler System.

Jiacen Xu1,2, Lixiang Ren3,4, Huayu Fan5

  • 1School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China. jiacenxu@126.com.

Sensors (Basel, Switzerland)
|July 20, 2018
PubMed
Summary

This study introduces an efficient Pulse Doppler (PD) process using poly-phase coded pulses to suppress range ambiguity and detect moving targets in clutter. The novel method significantly improves detection performance, especially in challenging environments.

Keywords:
PD processambiguity suppressionclutter suppressioninverse filteroptimal filter

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing

Background:

  • Conventional Pulse Doppler (PD) systems face range ambiguity due to fixed waveform parameters, limiting moving target detection in cluttered environments.
  • Diverse pulse trains can suppress ambiguity but introduce sidelobe dispersion, degrading performance.

Purpose of the Study:

  • To propose a novel and efficient PD process for suppressing range ambiguity and detecting moving targets under strong clutter.
  • To mitigate sidelobe dispersion and enhance clutter suppression capabilities in PD systems.

Main Methods:

  • Utilizing poly-phase coded pulses with optimal receiving filters to mitigate sidelobe dispersion.
  • Implementing a novel clutter suppression procedure within the PD process.
  • Employing well-designed receiving and inverse filters.

Main Results:

  • Significant mitigation of dispersed sidelobes was achieved.
  • Strong clutter was effectively suppressed by the novel procedure.
  • Improved detection results for both near and remote targets compared to conventional methods, particularly in strong clutter scenarios.

Conclusions:

  • The proposed efficient PD process effectively suppresses range ambiguity and detects moving targets in clutter.
  • The use of poly-phase coded pulses and optimal filters significantly reduces sidelobe dispersion.
  • The integrated clutter suppression procedure enhances detection performance in challenging environments.