摘要
概述了直接数字频率合成(DDS)技术的原理,给出了一种基于DDS技术的声学多普勒流速测量系统的设计方案,介绍了各部分电路的功能和设计思路。系统以TI公司的单片机MSP430F149为控制和信号处理核心,将DDS技术引入发射和正交解调模块,可实现较传统模拟方式更为经济、高效、精确的流速测量。
The principle of Direct Digital Synthesizer （DDS） is briefly introduced and a DDS- based acoustic Doppler current velocity measurement system has been presented in this paper. The design ideas of the hardware circuits, together with the functions of different hardware devices,have been introduced in detail. The single chip computer MSP430F149 as the control and processing core of the system can greatly improve the speed and other performances of the system. Moreover, the DDS technique is applied in the transmitting circuits and the Quadrature Demodulation circuits,which makes the system more eco nomic,more efficient and more accurate compared with the traditional analog system.
出处
《现代电子技术》
2007年第1期95-98,共4页
Modern Electronics Technique
关键词
直接数字频率合成(DDS)
声学多普勒效应
流速测量
正交解调
Direct Digital Synthesis （DDS）
acoustic doppler effect
current velocity measurement
quadrature demodulation
