天波超视距雷达目标录取方法的研究

天波超视距雷达（OTHR）的工作方式和工作环境比较复杂,雷达的定位精度、检测概率和数据率与常规雷达不同,容易受外部噪声和杂波的影响。由于电波要通过电离层传播来探测目标,电离层的瞬时变化和多模式会污染雷达回波信号,并产生多路径效应,使超视距雷达测量得到的目标数据存在不确定性和模糊性,要从这种数据中正确识别出目标并能自适应关联跟踪处理是很困难的事。文中根据OTHR雷达的实际情况,参照常规雷达的目标录取方法,在自动跟踪的基础上,研究并开发出适合超视距雷达工作的人工录取和半人工录取方法,使得雷达在恶劣环境下也能充分发挥正常的工作能力。

Research of Skywave OTHR Target Extraction

The work mode and environment of the skywave over-the-horizon radar(OTHR) is relatively complicated.Affected by external nonstationary noise and clutters easily,the locating accuracy,detection probability and data rate of this radar are different from general radar.In order to detect target over the horizon,the electromagnetic wave must be propagated through the ionosphere.Since the radar returns can be contaminated by instantaneous change and multi-mode propagation of the ionosphere,the multi-path effect may appear.It makes the radar target data that measured by the OTHR uncertain and ambiguous.It is very difficult to pick up target correctly and to perform association and track processing with this data set.According to the statement of the HF radar,and refered to target extraction mode of the microwave radar,we have developed a manual/semi-manual extraction mode for OTHR operation on the basis of adaptive tracking technique.It makes this radar operating effectively under worse environmental conditions.