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Related Concept Videos

Echo01:06

Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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SFCW Radar with an Integrated Static Target Echo Cancellation System.

Danijel Šipoš1, Dušan Gleich1

  • 1Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska Cesta 46, 2000 Maribor, Slovenia.

Sensors (Basel, Switzerland)
|September 10, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces an echo cancellation method for Continuous Wave (CW) radar systems to automatically remove stationary targets. The system effectively suppresses static echoes, improving radar performance without affecting dynamic targets.

Keywords:
SFCW radarclutter cancellationclutter suppressionecho cancellationecho suppressionground-penetrating radarthrough-wall imaging radar

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Area of Science:

  • Electrical Engineering
  • Radar Systems
  • Signal Processing

Background:

  • Continuous Wave (CW) radar systems, including Ground-Penetrating Radar (GPR) and Through-Wall Imaging Radar (TWIR), suffer from receiver saturation and background noise due to strong echoes from stationary targets.
  • Current methods like automatic gain control mitigate saturation but do not remove the underlying static target reflections from the signal.
  • The need exists for an effective method to automatically remove static targets in moving radar platforms to enhance signal clarity and data interpretation.

Purpose of the Study:

  • To propose and validate a novel method for real-time multiple static target Echo Cancellation (EC) in Frequency Modulated Continuous Wave (FMCW) or Swept Frequency Continuous Wave (SFCW) radar systems.
  • To design an integrated system using active Integrated Circuit (IC) components for efficient static echo removal.
  • To demonstrate the system's effectiveness in suppressing static targets without impacting the detection of dynamic targets or requiring high-dynamic-range receivers.

Main Methods:

  • Development of an echo cancellation system integrated into an SFCW radar operating between 500 MHz and 2.5 GHz.
  • Utilizing active IC components to generate and sum a corresponding echo cancellation signal for each frequency step with the received echo.
  • Designing the system for a moving radar platform, assuming a constant distance between the surface and targets.

Main Results:

  • Simulated static target echoes were suppressed by up to 38 dB using a cable as a known target.
  • Experimental results in a real-world scenario with a moving radar platform demonstrated up to 20 dB attenuation of static targets.
  • The proposed EC system showed minimal impact on the radar's size and power consumption, and did not affect the detection of dynamic targets.

Conclusions:

  • The proposed echo cancellation system effectively removes multiple static targets in real-time for SFCW radar systems.
  • The method offers a significant advantage by eliminating the need for high-dynamic-range receivers and preventing saturation.
  • This technique presents a promising solution for compact implementation in SFCW radars and other CW radar types for improved performance.