强等离子鞘套下航天返回舱相控阵雷达探测问题研究

Research on Detection Problem of Space Re-Entry Capsule with Phased Array Radar Under Intense Plasma Sheath

为了有效应对强等离子鞘套环境下相控阵雷达对再入航天器的探测跟踪任务,设计采用多种波形的航天器目标多通道临空复制跟踪策略。针对等离子鞘套的特性和对雷达探测跟踪的不利影响,分别从信号带宽、检测门限和信号波形等方面进行了适应性改进。采用大的跟踪带宽、慢门限凝聚检测送点方式提升常规线性调频信号检测能力;采用宽、窄带交替跟踪方式提升目标距离分辨与检测能力;采用相位编码波形屏蔽鞘套的影响,稳定跟踪目标;采用正负LFM信号检测产生相关强点迹,以保持目标跟踪;复制跟踪策略在实际任务中进行了应用验证,取得了较好的效果。

In order to effectively deal with the detection and tracking mission of phased array radar in the envi-ronment of intense plasma sheath,a multi-channel airborne replication tracking strategy with various waveforms is designed.Aiming at the characteristics of plasma sheath and its adverse ffects on radar detection and track-ing,the adaptive improvements are made in signal bandwidth,detection threshold and signal waveform.Large tracking bandwidh and slow threshold detection are used to improve the conventional linear frequency modula-tion signal detection capability.The alternating tracking method of wide and narrow band is used to improve the range resolution and detection capability of the target.The phase coded waveform is used to shield sheath af-fects and track target stably.Positive and negative LFM signals are used to detect and generate correlative strong point to maintain target tracking.The replication tracking strategy is applied in practical tasks and good results are achieved.