Chirped AM激光雷达中线性调频信号的产生  

Generating technique of chirp signal applying to chirped AM laser radar

作　　者：杨文进[1] 赵继广[1] 杜小平[1] 赵阳[1] 

机构地区：[1]装备指挥技术学院研究生管理大队,北京101416

出　　处：《红外与激光工程》2007年第z1期478-481,共4页Infrared and Laser Engineering

摘　　要：线性调频强度调制(Chirped AM)激光雷达将微波雷达中调频测距原理巧妙地应用于激光雷达,用一个线性调频的射频副载波调制激光输出强度。介绍了FM测距的基本数学原理,及激光雷达系统的基本构成和工作原理。在分析对比本体制激光雷达中一项关键技术——线性调频信号产生几种实现方法的基础上,依据直接数字频率合成和正交调制技术,提出了一种宽带线性调频信号产生方案。介绍了信号发生系统的基本结构以及工作原理,探讨了系统实现的关键技术、技术难点及改进办法。Chirped AM laser radar combines the merits of FM/CW ranging techniques and the laser.In contrast with previous FM/CW laser radar concepts,it is laser power is modulated with a RF signal whose frequency is linearly modulated.The frequency deviation between the transmit signal and the reflected signal is proportional to the target range.A summary of FM ranging theory and basic theory of operation in the laser radar are introduced.A digital approach for the generation of wideband chirp signal based on direct digital synthesis(DDS) and the bandwidth extension method via quadarture modulation is introduced.The key technologies,technical difficulties and improving methods are discussed.

关 键 词：线性调频信号 激光雷达 ChirpedAM 直接数字频率合成 正交调制 

分 类 号：TN958.98[电子电信—信号与信息处理]