伪码动态延时技术研究

Research on Pseudorandom Code Dynamic Delay

针对在雷达高度表回波模拟中的应用 ,介绍了基于EPROM和PLD的两种类型的伪码动态延时技术。前者将存储在EPROM中的伪码序列从不同位置开始读取就得到不同的延时值 ,后者的延时值是通过控制PLD中伪码发生器的启动时刻得到的。对于后者 ,又介绍了两种实现技术 ,即仅在延时变化时同步和每个伪码周期都同步的伪码动态延时技术。

Aiming at the application to echo simulation of radar altimeter, two methods realizing pseudorandom code dynamic delay are introduced in this paper. The first one stores pseudorandom code sequence in EPROM, and gets different delay values by reading from different addresses of EPROM, while the secand another changes the delay values by controlling the start up time of pseudorandom code generator in PLD, for which two techniques realizing pseudorandom code dynamic delay are introduced in this paper, one is synchronizing at the change of delay, and another one is synchronized at every period of pseudorandom code. The feasibility of all above methods is verified by simulation and experiment.