【摘要】 简要介绍了多路径信号建模技术的基本原理。水听器接收到的多路径声信号由一系列指数函数组成,通过数学变换推导得到多路径信号模型表达式,估算每个到达信号指数分量的频率、幅度和相位。由于多路径模型中第一个到达信号对应于直达信号,所以,感兴趣的参数是最先到达的稳态信号分量的幅度和相位。利用多路径信号建模技术得到换能器的发送电压响应,其测试结果与自由场稳态测试结果相比较,一致性很好,说明多路径建模技术是换能器低频校准的一个十分有效的方法。更多还原

【Abstract】 The technique of multipath signal modeling for electroacoustic transducer calibration is described. The multipath acoustic signals at the hydrophone consist of multiple arrivals of sums of exponential functions, deriving the multipath signal modeling expression by mathematically transformation. The frequencies, amplitudes and phases for the exponential components in each of the arriving signals are estimated by the algorithm. Since the first signal arrival in the multipath model corresponds to the direct signal, the parameters interested are the amplitude and phase of the steadystate signal component with the earliest arrival time. Transmitting Voltage Response (TVR) of a projector is obtained using the multipath modeling method. The measurement results are in a good agreement with that of the steady state measurement curves. The technique is a very efficient method to calibrate electroacoustic transducer at low frequencies.更多还原