高精度声呐信号预处理系统的改进与实现  

Improvement and realization of signal preprocessing system for high precision sonar

作　　者：苗康乐[1] 杨日杰[1] 杨成伟[2] 

机构地区：[1]海军航空工程学院电子信息工程系 [2]中国人民解放军91911部队

出　　处：《仪器仪表学报》2011年第12期2720-2725,共6页Chinese Journal of Scientific Instrument

基　　金：航空科学基金(20095184)资助项目

摘　　要：针对高精度声呐信号预处理系统中出现的时钟频率选择及过控问题进行了研究。在对多次实验结果进行观测和研究的基础上,利用傅里叶变换法,以AGC的控制特性为依据,分析了窄带带通滤波器的幅值延迟效应及上限比较器输出脉宽不确定性对系统的影响。相应地对高精度声呐信号预处理系统进行了改进并予以工程实现,给出了AGC时钟的最优选取准则,去除了前述因素对系统的不利影响。测试结果表明,改进后的预处理系统工作稳定,完成AGC的时间显著缩短。Aiming at the problem of clock frequency selection and over-control in preprocessing system for high precision sonar, based on the observation and research results of several experiments, the amplitude delay effect of narrow-band bandpass filter on the system is analyzed using Fourier transformation, the effect of the unstable output of upper limit comparator on the system is also analyzed based on the control features of AGC. Accordingly, an im- provement and realization of the preprocessing system for high precision sonar is implemented, the best selection rules for AGC clock frequency are given. Test results show that the improved system works steadily and the AGC time is cut down significantly.

关 键 词：自动增益控制 预处理系统 窄带带通滤波 

分 类 号：TN97[电子电信—信号与信息处理] TP274[电子电信—信息与通信工程]