超视距雷达中的目标检测问题

工作在高频波段(3—30MHz)的超视距雷达能够探测和跟踪视距以外飞机、舰船等目标，它在民用和军事上均有重要的应用价值。但超视距雷达的目标信号会埋没在强海杂波中，使得目标信号的检测极为困难。本文先讨论了一阶和二阶Bragg海杂波特性，然后针对强海杂波中目标检测的特点，讨论了距离一频率维的目标恒虚警检测方案，并提出了一些有意义的建议。

Target detection problems in over the-horizon radar

Over-the-horizon radar(OTHR) which operates in a high frequency (3-30MHz) band can detect and track moving targets beyond the horizon such as vessels on sea and aircrafts at low altitude,it plays important role in military and civil applications.It's well known that target echo are embedded in sea clutter whose Doppler spectrum is generally dominated by the first order and second order Bragg lines.In order to detect targets effectively,a range-Doppler frequency CFAR detection method is presented in this paper,and many conventional CFAR algorithms that can be applied in OTHR are analyzed,in addition some helpful advice are given.