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Abstract The large array multi-group scanning ultrasonic phased array system can provide better scanning flexibility, image
contrast, increase the diversity of focal law and realize distributed scanning. In order to improve resource utilization, ensure realtime
performance and realize distributed scanning under limited resources, it is necessary to study system resource reuse and data
processing cooperative scheduling, reduce hardware consumption and avoid signal processing overlapping conflicts, and improve instrument
performance. Therefore, the scheduling theory, methods and key technologies of multi-group delay and focus, multi-group
homogeneous flowshop signal processing, heterogeneous hierarchical multi-DAG (directed acyclic graph) signal processing in multigroup
scanning system ultrasonic phased array with large array are mainly studied. The method also applied to the development of
multi-group scanning instrument of large-element ultrasonic phased array.
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