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A Novel Monopulse Angle Estimation Method for Wideband LFM Radars.

Yi-Xiong Zhang1, Qi-Fan Liu2, Ru-Jia Hong3

  • 1Department of Communication Engineering, Xiamen University, Xiamen 361005, China. zyx@xmu.edu.cn.

Sensors (Basel, Switzerland)
|June 9, 2016
PubMed
Summary

This study introduces a new method for wideband radar angle estimation using cross-correlation of linear frequency modulated (LFM) signals. The technique effectively estimates angles in low signal-to-noise ratio (SNR) conditions, improving radar capabilities.

Keywords:
amplitude comparisoncross-correlationfrequency estimationmonopulse angle estimationwideband LFM signals

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Electromagnetics

Background:

  • Traditional monopulse angle estimation methods are limited to narrowband radars.
  • Wideband radar systems require advanced techniques for accurate angle estimation.
  • Noise in wideband radars presents challenges for energy accumulation in high-resolution range profiles.

Purpose of the Study:

  • To investigate monopulse angle estimation for wideband linear frequency modulated (LFM) signals.
  • To develop a robust method for angle estimation in low signal-to-noise ratio (SNR) environments.
  • To enhance the capabilities of modern wideband radar systems.

Main Methods:

  • Utilizing a cross-correlation operation to accumulate energy from received echo signals.
  • Converting the angle estimation problem to estimating the frequency of the cross-correlation function (CCF).
  • Testing the proposed algorithm with wideband LFM signals.

Main Results:

  • The proposed cross-correlation method demonstrates effective energy accumulation for wideband signals.
  • The algorithm achieves performance comparable to traditional amplitude comparison methods.
  • The method successfully converts angle estimation to CCF frequency estimation.

Conclusions:

  • The proposed cross-correlation algorithm is a viable method for wideband monopulse angle estimation.
  • This approach can enable future radars to use wideband signals for both tracking and imaging, increasing data rates and anti-jamming capabilities.
  • The method significantly extends the unambiguous angle estimation range for wideband radars.