摘要
空天双基雷达系统具有收发平台距离远、收发波束覆盖尺度以及平台速度差异大且发射-接收几何构型复杂的特点。收发分离以及地球自转等因素的影响,导致空天双基雷达系统杂波谱严重扩展且空时耦合非均匀性更加突出。对此,建立空天双基雷达空时杂波模型,该模型适用于任意轨道高度的天基发射平台。主要分析发射/接收天线方向图的波束覆盖差异性,推导多普勒频率和空间频率的表达式,并且通过仿真实验讨论不同轨道高度的天基平台对应的发射多普勒分布以及空天双基杂波的空时耦合特性与距离依赖性。仿真结果表明,所提建模方法适用于任意空天双基构型下的杂波特性分析。
The air-space bistatic radar system has the characteristics of ultra long baseline distance between the transmitter and receiver platforms,large coverage scale of the transmission and reception beams,large diffe-rences in platform speed,and complex geometric structure configuration of transmitter and receiver.Due to factors such as the separation of transmitter and receiver,as well as the rotation of the Earth,the clutter spectrum of the air-space bistatic radar system has significantly expanded and the non-uniformity of spatial-temporal coupling becomes more prominent.Therefore,a spatial-temporal clutter model for air-space bistatic radar is established,which is suitable for space-based launch platforms at any orbital altitude.The main focus is analyzing the differences in beam coverage of the transmission and reception antenna pattern,deriving expressions for Doppler frequency and spatial frequency,and discussing the transmission Doppler distribution corresponding to different orbital heights of space-based platforms through simulation experiments,as well as the spatial-temporal coupling characteristics and range dependence of air-space bistatic clutter.The simulation results indicate that the proposed modeling method is applicable to the analysis of clutter characteristics with any air-space bistatic structure configuration.
作者
阚庆云
许京伟
廖桂生
王伟伟
KAN Qingyun;XU Jingwei;LIAO Guisheng;WANG Weiwei(National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China;China Academy of Space Technology Xi’an Branch,Xi’an 710100,China)
出处
《系统工程与电子技术》
北大核心
2025年第6期1806-1815,共10页
Systems Engineering and Electronics
基金
国家自然科学基金(61931016,62071344)
陕西省自然科学基础研究计划(2023-JC-JQ-55,2024JC-TBZC-19)资助课题。
关键词
空天双基雷达
杂波建模
双基等距离环
收发波束覆盖
空时耦合
air-space bistatic radar
clutter modeling
bistatic iso-range ring
transmission and reception beam coverage
spatial-temporal coupling
