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Two-Stage Fast DOA Estimation Based on Directional Antennas in Conformal Uniform Circular Array.

Yao Xie^1,2, Mo Huang^1,2, Yuanyuan Zhang¹

¹Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China.

Sensors (Basel, Switzerland)

|January 6, 2021

Summary

A new two-stage algorithm enhances direction-of-arrival (DOA) estimation for conformal array radar. This method accurately identifies multiple targets without range-angle matching, improving radar system performance.

Keywords:

conformal UCA decouple direction-of-arrival (DOA)directional antenna multi-target two-stage

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Published on: March 6, 2019

Area of Science:

Radar Systems Engineering
Signal Processing
Electromagnetics

Background:

Directional antennas in conformal arrays cause distinct echo signal responses, impacting direction-of-arrival (DOA) estimation accuracy.
Existing DOA estimation methods struggle with multi-target scenarios and the unique characteristics of conformal uniform circular arrays (UCAs).

Purpose of the Study:

To develop an accurate and efficient algorithm for DOA estimation in conformal UCAs with directional antennas.
To address the challenges posed by distinct antenna responses and multi-target environments.

Main Methods:

A two-stage fast DOA estimation algorithm is proposed, involving multi-target decoupling and detection in the pre-processing stage.
The algorithm utilizes amplitude and phase information for rough and precise DOA estimation, respectively, in the second stage.
Performance is evaluated through simulations and anechoic chamber experiments, comparing against DA-MUSIC, S-MUSIC, and Capon-like algorithms.

Main Results:

The proposed two-stage algorithm accurately estimates DOAs in multi-target scenarios without requiring range-angle pair matching.
Experimental results demonstrate superior accuracy and reduced computational complexity compared to existing methods.
The algorithm shows faster processing times and higher validity in both simulated and real-world radar experiments.

Conclusions:

The two-stage fast DOA estimation algorithm offers a robust solution for accurate DOA estimation in conformal array radar systems.
Its efficiency and accuracy make it suitable for practical engineering applications, particularly in complex multi-target environments.