一种基于功放幅频特性的信号源设计方法
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摘要
针对水声学实验中信号源输出信号幅频特性非平坦问题,提出了一种基于功放幅频特性的信号源设计方法。首先介绍了信号源组成设备结构以及软件运行流程;然后分析了信号源组成设备中功率放大器对信号源输出信号产生的影响;最后根据功率放大器幅频特性对信号源输出信号实现了补偿修正,得到幅频特性平坦的输出信号。理论分析和仿真结果表明,该方法可有效缩小其他频点与谐振频点的幅度差异,使输出信号在整个滤波频带的幅频特性波动性保持在3dB内,降低了功放非线性变换对信号源发射信号产生的影响。
For the problem of the amplitude-frequency characteristics of signal source output signal being not flat in the underwater acoustic experiment,a design method of signal source based on amplitude-frequency characteristics of power amplifier was proposed.First the component equipment of signal source and software operation flow was introduced.Then the influence of power amplifier on signal source output signal was analyzed.Finally,the output signal source signal was corrected according to the amplitude-frequency characteristic of power amplifier.Theoretical analysis and experimental results show that,the method can effectively reduce the amplitude difference between the other frequency and resonant frequency,remain the amplitude frequency characteristics of output signal within 3 dB in the filter band,and reduce the impact of the power amplifier nonlinear transformation on signal transmitting.
For the problem of the amplitude-frequency characteristics of signal source output signal being not flat in the underwater acoustic experiment,a design method of signal source based on amplitude-frequency characteristics of power amplifier was proposed.First the component equipment of signal source and software operation flow was introduced.Then the influence of power amplifier on signal source output signal was analyzed.Finally,the output signal source signal was corrected according to the amplitude-frequency characteristic of power amplifier.Theoretical analysis and experimental results show that,the method can effectively reduce the amplitude difference between the other frequency and resonant frequency,remain the amplitude frequency characteristics of output signal within 3 dB in the filter band,and reduce the impact of the power amplifier nonlinear transformation on signal transmitting.
引文
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[3]李斌,尚超.基于虚拟仪器技术的多功能水声信号发生器[J].舰船电子工程,2013,33(2):155-157.
[4]陈迪,刘旺锁,姚直象.基于DDS的声呐信号发生器设计与实现[J].国外电子测量技术,2012,31(5):74-76.
[5]张艳艳,饶炜.主动定向浮标信号发生器设计[J].舰船电子工程,2016,23(10):48-51.
[6]魏岳伦,岳庆英,齐庆堃,等.基于Nios II的DDS函数信号发生器[J].国外电子测量技术,2016,35(7):13-16.
[7]孙伟超,汪定国,吴忠德.基于AD9910的调频信号发生器设计[J].电子测量技术,2011,30(10):76-79.
[8]张占强,孟克其劳.基于Proteus的多波形信号发生器设计仿真[J].电子测量技术,2013,36(3):15-19.
[9]董亚男,马俊,周泉,等.基于单片机的智能信号发生器设计与仿真[J].电子测量技术,2014,37(1):61-65.
[10]黄超,杨瑞明,杨广辉.任意信号发生器软件设计[J].现代电子技术,2008,33(10):177-179.
[11]冯冰.用于水声设备调试的多用信号源设计与实现[D].哈尔滨:哈尔滨工程大学,2015.
[12]张艳艳,饶炜.主动定向浮标信号发生器设计[J].舰船电子工程,2016(10):48-51.
[13]卢苇,蓝宇.电磁式大功率水下甚低频声源研究[J].哈尔滨工程大学学报,2011,32(7):877-883.
[14]李响.高频宽带水声发射机的设计与实现[D].哈尔滨:哈尔滨工程大学,2011.
[15]刘科,田书林,肖寅东.基于伪插值的信号源幅频特性补偿方法研究[J].电子测量与仪器学报,2009,23(7):12-16.
[16]郁战,王晓森,陈树越.基于DDS信号源的幅频特性补偿方法研究[J].计算机测量与控制,2012,20(2):494-496.