Correlation-based aberration correction in the presence of inoperable elements.
Estimation of phase aberrations using correlation processing between neighboring elements in a phased array is explored in the presence of inoperable elements. Using a CORDIC-based implementation of a complex baseband correlator, inactive elements can be identified simultaneous with correlation processing. Following detection of inoperable elements, a simple rerouting of the adaptive beam former is used to eliminate these elements from correlation analysis. Experimental results on a 3.33-MHz, 64-element array system with four contiguous, inactive elements demonstrate the robustness of the simple rerouting method for accurate phase aberration estimation.
O'Donnell
M
M
Dept. of Electr. Eng. and Comput. Sci., Michigan Univ., Ann Arbor, MI.
Engeler
W E
WE