海洋环境噪声接收机的设计与实现  

Design and implementation of ocean ambient noise receiver

作　　者：徐灵基[1] 杨益新[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《电子测量技术》2016年第4期31-35,共5页Electronic Measurement Technology

基　　金：国家自然科学基金(11274253)资助

摘　　要：针对海洋环境噪声的测量,设计了一种低噪声、宽带、高动态范围的水声接收机。采用新一代真有效值转直流芯片AD8436实现噪声信号有效值的实时高精度计算,并通过微控制器调整程控增益放大器的增益码完成自动增益控制,同时自动记录系统增益值。该接收机具有良好的人机交互接口,既可在线传递系统的增益,又可按用户需求设定固定的增益。实验测试表明,该接收机的等效输入自噪声小等于3μVrms,频率带宽为20 Hz^5.5kHz,信号输入的动态范围大等于68dB;且具有精度高、适应性强和电路性能稳定等特点,可较好地满足海洋环境噪声的测量与分析。A low-noise,broadband,high dynamic-range underwater acoustic receiver is designed to measure ocean ambient noise.First,new generation true RMS-to-DC chip AD8436 realizes real-time high-precision calculations of RMS value of the noise signal.Then,microprocessor is used to implement AGC by adjusting the gain code of programmable gain amplifier.Meanwhile,the system gain values are automatically recorded.The receiver has an excellent man-machine interactive interface,through which the gain values are transferred to the embedded host computer online and the system gain can also be set according to customer＇s requirement.The experiment result shows that the equivalent input noise of the receiver is lower than 3μVrms,the frequency band is 20Hz^5.5kHz,and the input dynamic range is larger than 68 dB.Besides,the designed receiver is precise,flexible and stable.Therefore,it can satisfy the demand of measurement and analysis of ocean ambient noise.

关 键 词：海洋环境噪声 水声接收机 真有效值转直流 自动增益控制 增益记录 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]