摘要
This paper presents a method to control the gain within pulse and accurately measure the amplitude of an underwater sound pulse in a wide dynamic range. In the method a loop composed of a gain controlled unit and a microcomputer is employed.This method also gives satisfactory results when there exist distortion of signal cnvelop and fluctuation of signal amplitude. The basic mathematical model of instantaneous amplitude-gain control and amplitude measurement and its hardware structure are presented. The calibration method of the system for retransmitting (responding) with required sound level is given as well.
This paper presents a method to control the gain within pulse and accurately measure the amplitude of an underwater sound pulse in a wide dynamic range. In the method a loop composed of a gain controlled unit and a microcomputer is employed.This method also gives satisfactory results when there exist distortion of signal cnvelop and fluctuation of signal amplitude. The basic mathematical model of instantaneous amplitude-gain control and amplitude measurement and its hardware structure are presented. The calibration method of the system for retransmitting (responding) with required sound level is given as well.
