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A New Gain-Phase Error Pre-Calibration Method for Uniform Linear Arrays.

Chang Liu1, Xiao Tang1, Zhi Zhang1

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Summary

A novel method calibrates gain-phase errors in uniform linear arrays (ULAs) using a single source. This technique divides arrays into sub-arrays for accurate error extraction, improving antenna performance.

Keywords:
DOA estimationadaptive antenna nulling techniquegain-phase error calibrationuniform linear arrays (ULAs)weighted total least-squares (WTLS) problem

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Area of Science:

  • Signal Processing
  • Array Signal Processing
  • Antenna Calibration

Background:

  • Gain-phase errors degrade the performance of uniform linear arrays (ULAs).
  • Accurate calibration is crucial for effective adaptive antenna nulling and DOA estimation.

Purpose of the Study:

  • To propose a new gain-phase error pre-calibration method for ULAs.
  • To enable calibration using a single calibration source with a known direction of arrival (DOA).
  • To enhance the accuracy and efficiency of ULA calibration.

Main Methods:

  • Adaptive antenna nulling techniques are employed.
  • The ULA is divided into M-1 sub-arrays for sequential error extraction.
  • An errors-in-variables (EIV) model and a weighted total least-squares (WTLS) algorithm are formulated.

Main Results:

  • The proposed method uniquely extracts gain-phase errors for each sub-array.
  • The WTLS algorithm provides accurate gain-phase error estimation.
  • Simulation results validate the method's efficiency and feasibility for various ULA scales.

Conclusions:

  • The proposed single-source calibration method is effective for ULAs.
  • The approach demonstrates superiority over existing state-of-the-art calibration techniques.
  • The method offers a practical solution for improving ULA performance.