摘要
为提高相位式激光测距中测量距离的精度性及保证光波调制信号的频率和相位稳定性,提出了采用直接数字合成技术(director digital synthesis,DDS)代替传统的锁相式频率合成法,产生频率和相位稳定性高的正弦信号,从而保证测量精度的方案和实践。采用具有分辨率高、频率转换快的DDS技术的芯片AD9850,通过设计相应的电路,程序和低通滤波来实现正弦信号源。实验结果表明,AD9850产生的正弦信号较好地解决了频率漂移和相位抖动等问题。
In order to improve the accuracy ofphase-in laser ranging and ensure frequency and phase stability ofthe light modulation signal. Director digital synthesis （DDS） is put forward instead of the conventional phase-locked frequency synthesis and it can generate the sinusoidal signal which has a high stability in frequency and phase to ensure measurement accuracy of the program and practice. Sinusoidal wave generator is designed by circuit, program and low pass filter using the DDS chip AD9850 which has the character of higher resolution and faster frequency transformation. Experiment shows that the sinusoidal signal generated by AD9850 can refrain from the problems, such as frequency dispersion and phase dithering.
出处
《计算机工程与设计》
CSCD
北大核心
2009年第8期1879-1881,共3页
Computer Engineering and Design
基金
国家自然科学基金项目(60473008)
上海市高等学校科学技术发展基金项目(04AB38)
上海市重点学科建设基金项目(J50103)
