由于多普勒信号处理技术在整个激光多普勒测速(LDV)系统中起到关键作用, 针对仅利用快速傅里叶变换处理多普勒信号存在精度低的问题, 频谱校正方法的研究显得十分必要。通过阐述比值法、能量重心法和相位差法三种离散频谱校正方法的基本原理和仿真实验, 表明三种方法均可使校正频率更加接近真实值。考虑到算法的复杂度和抗噪性能等因素的影响, 选用了能量重心法对实测多普勒信号进行频率校正, 且校正效果明显。

The Dopplor signal processing technology is very important in laser Doppler velocimetry(LDV)systems. Owing to the low precision of LDA processor, it is highly necessary to study the spectrum correcting methods. The principles of three correction methods, namely, ratio, energy centrobaric and phase difference are expounded and simulation experiment carried out. The results prove that all three methods can make the corrected frequency closer to the actual value. Considering the complexity and noise-resistence capability of these methods, the energy centrobarid correction is picked out and applied in real-time measurement, and the effect of the processing is satisfying.