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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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SMSP Mainlobe Jamming Suppression with FDA-MIMO Radar Based on FastICA Algorithm.

Pengfei Wan1,2, Guisheng Liao1, Jingwei Xu1

  • 1National Key Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China.

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|July 8, 2023
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Summary

This study introduces a novel method for Frequency Diverse Array (FDA) Multiple-Input Multiple-Output (MIMO) radar to suppress smeared spectrum (SMSP) jamming. The technique significantly enhances radar target search performance, even in low signal-to-noise conditions.

Keywords:
blind source separationfrequency diverse arraymaximum entropy methodmultiple-input multiple-outputsmeared spectrum jamming

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Area of Science:

  • Radar Systems Engineering
  • Electronic Warfare
  • Signal Processing

Background:

  • Ground-based radar target search is degraded by smeared spectrum (SMSP) jamming in electronic warfare environments.
  • Traditional linear frequency modulation (LFM) radars struggle with SMSP jamming from self-defense jammers.
  • Effective jamming suppression is crucial for maintaining radar performance.

Purpose of the Study:

  • To propose a novel SMSP mainlobe jamming suppression method for FDA-MIMO radar.
  • To enhance the target search capabilities of radars operating in jamming conditions.
  • To improve radar detection probability and signal separation accuracy.

Main Methods:

  • Utilizing a Frequency Diverse Array (FDA) Multiple-Input Multiple-Output (MIMO) radar system.
  • Employing the maximum entropy algorithm for target angle estimation and sidelobe interference removal.
  • Applying blind source separation (BSS) algorithm to separate mainlobe interference and target signals by exploiting range-angle dependence.

Main Results:

  • Successful separation of target echo signals from jamming.
  • Achieved a similarity coefficient exceeding 90% for separated target signals.
  • Significantly enhanced radar detection probability, particularly at low signal-to-noise ratios.

Conclusions:

  • The proposed FDA-MIMO radar method effectively suppresses SMSP mainlobe jamming.
  • The technique maintains high target echo signal integrity and improves detection performance.
  • This approach offers a robust solution for radar target search in challenging electronic warfare scenarios.