水下爆炸信号采样分析与系统实现

Sampling Analysis and Realization of the Subaqueous Explosion Signal

文中描述了水下爆炸信号的基本特征,它是一种单次瞬态信号,由类似于单边指数衰减的冲击波信号和近似半余弦脉冲的二次脉动波信号组成。冲击波信号频率不大于10kHz,脉动波信号频率不大于0.1kHz。在满足奈奎斯特采样定理的基础上,提高信号采样频率可以改善信噪比。据此原理确定了冲击波过采样频率为1MHz,二次脉动波过采样频率为40kHz。MAX153是基于半闪速技术的高速8位模数转换器,它与8位单片机AT89C51构成的采样系统可以方便地实现对冲击波和二次脉动波的采样并满足测量精度要求。文中还设计了采样频率、采样时间、通道放大倍数等关键指标。

This paper describes the subaqueous explosion signal,it is single and transient,it consists of shock wave and pulsating wave. The frequency of shock wave is no more than 10 kHz,and 0.1 kHz for pulsating wave. According to Nyquist sampling theorem and oversampling theory,the oversampling frequency of shock wave is 1 MHz,and 40 kHz for pulsating wave. MAX153 based on half-flash technique is a high-speed ADC,the sampling system composed of MAX153 and AT89C51 can sample the shock wave and pulsating wave. This paper designs the sampling frequency,sampling time,and channel amplification factor.