基于LabWindows/CVI的主动声呐信号发射机设计

本文介绍了一种利用虚拟仪器技术[1]，通过NI数据采集卡及后续放大电路产生主动声呐信号的方法。本文以产生单频矩形脉冲信号（CWP）为例，软件设计中采用定时器查询和信号触发的方式产生信号，相比现有采用产生脉冲矩阵并延时发射的办法，具有调整更加方便灵活，精度更高的优点。硬件设计采用稳定可靠的成熟器件，确保系统在外场环境工作的可靠性。通过多路选通放大电路实现宽范围的声源级发射，通过高保真的集成功率放大器减少信号在发射过程中的畸变和噪声的引入[2]。相比传统发射机，微小的数据采集卡和放大电路可内置于工控机机箱内，作为便携式声呐信号发射机。

Design of Active Sonar Signal Transmitter based on LabWindows/CVI

This paper gives a method using virtual instruments technology to generate sonar signal by NI DAQ card and amplifying circuit[1]. This paper gives an example of generating CWP signal. In design of software, it generates signal by the way of timer querying and signal triggering. Existing method generates an array then delay to transmit. Method introduced in this paper, by contrast, is more flexible and has a higher degree of accuracy. Hardware design adopts stable and mature chips, to make sure the system can perform well in outfield. Multiple strobe circuits achieve a wide range of SL. High-fidelity integrated power amplifiers reduce the distortion of the signal during transmission and the introduction of noise[2].Compared with traditional sonar signal transmitter, the micro DAQ card and amplifying circuit can be put inside the industrial control computer, used as a portable sonar signal transmitter.