C频段雷达黑障区捕获跟踪新型返回舱策略研究

Capturing and Tracking Strategy of C-Band Radar for New Type of Reentry Capsule in Black-Out-Area

为阐明黑障区全过程返回式航天器雷达反射回波信号传输规律,缩短C频段雷达黑障区重捕目标的时间,基于等离子体鞘套影响电磁波传输理论,详细分析了等离子体碰撞频率等物理参数变化对电磁波传输的影响,得出了黑障区不同海拔高度的等离子体鞘套对电磁波造成何种影响的结论。通过实测数据分析,证实了结论的正确性。依据该结论,综合考虑黑障区高度、目标速度、RCS、测站位置等因素,制定了C频段相控阵雷达黑障区捕获跟踪新型返回舱策略。经实际飞行试验验证,捕获跟踪策略逻辑清楚,有效可行,可为返回式航天器黑障区外弹道测量提供借鉴。

In order to clarify the transmission law about the radar reflected echo signal of reentry-type spacecraft in the whole process of the black-out-area and shorten the time for the C-band radar to recapture the target in the black-out-area, based on the theory that the plasma sheath affects the electromagnetic wave transmission, the influences of changes in physical parameters such as plasma collision frequency on electromagnetic wave transmission are analyzed in detail, and the conclusion is drawn that the plasma sheaths at different altitudes in the black-out-area will cause what kind of influence on electromagnetic waves.The analysis of the measured data confirmed the conclusion.Based on this conclusion, comprehensively considering factors such as the height of the black-out-area, target speed, RCS,and station location, a new strategy for the C-band radarthe to capture and track a new type reentry capsule in the black-out-area is developed.The actual flight test verifies that the acqwisition and tracking strategy is logical, effective and feasible, which can provide a reference for the trajectory measurement of the reentry-type spacecraft in the black-out-area.