一种基于DDS技术的新型激光测距系统的设计

A New Laser Ranging System Based on DDS Technology

提出了将直接数字频率合成(DDS)技术应用到连续波相位式激光测距系统中的整体设计方案,讨论了DDS技术和相位式激光测距的基本原理和特点,并对DDS的杂散性能进行了初步分析。在该系统中,采用了频率稳定度高、切换速率快和低相位噪声的DDS频率合成源,可以实现高精度的差频测相和全数字测相,对于工程实现高精度和大量程相位式激光测距系统提供了新的途径,同时引入了数字信号处理器件,将进一步提升系统的整体性能。

This paper advances the whole design scheme of consecutive wave phasic laser ranging ,based on Direct Digital Synthesis （DDS）,and describes the characteristics and principles of DDS and phasic Laser Ranging,and gives some basic analysis about the spuriousness characteristics of DDS. In the system,high stable frequency and low phase DDS are used,they can realize high accuracy and the performance of the system will be enhanced more.