Optimal arrangement of four-sensor dynamic acoustic array

Purpose - The purpose of this paper is to demonstrate the theoretical relationship between the layout of four-sensor dynamic acoustic array tracking system and systematic observation accuracy, and provide an algorithm to determine the optimal arrangement of four-sensor acoustic array and an indicator to evaluate acoustic array system measurement accuracy. Design/methodology/approach - In the present paper, the measurement principle of the four-sensor dynamic acoustic array tracking system is analyzed, and the system observation model and the conversion relationship between models are established. Subsequently, the optimization algorithm for the four-sensor dynamic acoustic array is deduced, the theoretical optimal arrangement of the four-sensor dynamic acoustic array tracking measurement system is obtained based on the optimal position dilution of precision function (PDOPF) of 2D target, and the static experimental study on sound-source bearing estimation is designed. The theoretical results are compared with the experimental results of the present study. Findings - The measurement accuracy of the four-sensor dynamic acoustic array tracking system is largely dependent on the layout of the acoustic sensor. Theoretical studies and experimental results demonstrated that an optimal PDPOF can be used to analyze the rationality of the layout. It can also serve as an indicator for the layout of the four-sensor dynamic acoustic array tracking system. Originality/value - The PDOPF value is presented as an indicator for the evaluation of the four-sensor dynamic acoustic array systematic observation accuracy based on theoretical analysis. The feasibility of the indicator and the rationality of the sensor layout in practical engineering application are verified through experimental studies on sound-source bearing estimation. The higher the PDOPF value is, the lower the accuracy of the system will be.