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Correlation-based aberration correction in the presence of inoperable elements.

M O'Donnell¹, W E Engeler

¹Dept. of Electr. Eng. and Comput. Sci., Michigan Univ., Ann Arbor, MI.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1992

Summary

This study introduces a robust method for estimating phase aberrations in phased arrays, even with inoperable elements. The technique uses correlation processing and adaptive beamforming for accurate aberration measurement.

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Area of Science:

Signal Processing
Array Signal Processing

Background:

Phased arrays are crucial for applications requiring precise signal control.
Estimating phase aberrations is essential for maintaining array performance.
Inoperable elements can significantly degrade the accuracy of aberration estimation.

Purpose of the Study:

To develop and validate a method for estimating phase aberrations in phased arrays with inoperable elements.
To demonstrate the effectiveness of correlation processing and adaptive beamforming for this task.

Main Methods:

Utilized a CORDIC-based implementation of a complex baseband correlator.
Developed a method to simultaneously identify inoperable elements during correlation processing.
Employed a simple rerouting strategy for the adaptive beamformer to exclude faulty elements.

Main Results:

Successfully identified inoperable elements concurrently with correlation processing.
The rerouting method effectively eliminated inoperable elements from the analysis.
Experimental results confirmed the robustness and accuracy of the proposed method on a 64-element array system.

Conclusions:

The proposed method provides accurate phase aberration estimation in the presence of inoperable elements.
Simultaneous identification and exclusion of faulty elements enhance the reliability of phased array systems.