基于频域测速系统的数据采集技术及实现

Data Acquisition Technique and Its Implementation Based on Principles of Velocity Measurement in Frequency Domain

本文介绍了基于频域测速的FFT弹道分析系统中数据采集部分所采用的几种采样技术,包括常规采样、间歇采样、变频采样和下采样。几种采样技术的综合使用,解决了在测量高速目标或测量时间较长时出现的数据存储空间不足的问题,并使测速精度在测量过程中近似不变。同时本文还给出了实现这些技术的硬件组成及软件流图。

This paper presents some sampling techniques used in data acquisition of FFT ballistic analysis system based on the fundemental principles of velocity measurement in frequency domain. It includes normal sampling, interval sampling, varied-frequency sampling and undersampling. By means of these techniques, the problem of data memory shortage is solved in measuring high speed targets or in long time measurements. An invariable velocity precision is achieved in the whole measuring process. This paper also presents the construction of hardware and the flow diagram of software in realizing these techniques.