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Enhanced Range Resolution Beamforming for Subarray-Based FDA.

Anyi Wang1, Yumeng Lu1, Yanhong Xu1

  • 1Xi'an Key Laboratory of Network Convergence Communication, College of Communication and Information Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.

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Summary
This summary is machine-generated.

This study introduces a subarray partitioning beamforming method for frequency diverse arrays (FDA) to solve range-angle coupling. The proposed method significantly enhances range resolution and suppresses sidelobes for improved radar performance.

Keywords:
BAK-means++ clustering algorithmrange resolutionsubarray-based frequency diverse arraytransmit-receive beamforming

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Area of Science:

  • Electromagnetics and Signal Processing
  • Radar Systems Engineering

Background:

  • Frequency Diverse Arrays (FDA) face range-angle coupling challenges.
  • Existing beamforming methods require optimization for improved resolution and sidelobe control.

Purpose of the Study:

  • To propose and analyze a subarray partitioning beamforming method for FDA.
  • To investigate uniform continuous and nonuniform discontinuous subarray structures.
  • To optimize subarray structure and element amplitudes for enhanced performance.

Main Methods:

  • Developed a transmit-receive signal model to address FDA's time-varying nature.
  • Investigated two subarray partitioning strategies: uniform continuous and nonuniform discontinuous.
  • Employed a joint optimization of the bat algorithm (BA) and K-means++ clustering.

Main Results:

  • Nonuniform discontinuous subarrays with nonlinear frequency offsets (FOs) narrowed mainlobe width to 1.29 km and achieved -11.75 dB PSLL.
  • Optimized FDA achieved a mainlobe width of 1.18 km and -12.32 dB PSLL.
  • Demonstrated significant improvements in range resolution and sidelobe suppression.

Conclusions:

  • The proposed subarray partitioning method effectively mitigates range-angle coupling in FDA.
  • Nonuniform discontinuous subarray structures combined with nonlinear FOs offer superior performance.
  • The optimized method shows significant potential for enhancing radar range resolution and beampattern focusing.