舰载高频地波雷达(OTHR)平台运动对回波信号调制机理的研究  

Analysis of the Modulating Machanism of Movement of Radar Plateform on the Back Scatting Signals in SBSWR

作　　者：许斌[1] 李博[1] 袁业术[1] 

机构地区：[1]哈尔滨工业大学电子工程系,黑龙江哈尔滨150001

出　　处：《电子学报》2008年第B12期109-113,共5页Acta Electronica Sinica

摘　　要：本文基于高频地波舰载OTH(Over-The-Horizon)雷达后向散射回波信号的物理模型,在理论上分析并导出了揭示雷达平台运动、雷达系统参数、目标物理属性以及目标运动特性之间内在联系的舰载高频地波OTH雷达回波信号在Doppler域里的频谱展宽方程;深入分析了高频地波舰载OTH雷达平台运动对雷达回波信号高频相位的调制机理及平台运动对回波信号Doppler频谱结构的影响;推导了雷达平台运动与不同物理尺寸目标及不同运动状态目标相互作用的动态几何关系;给出了在雷达平台运动条件下静止面目标、静止点目标及运动面目标和运动点目标的回波信号频谱展宽表达式.这些基本关系式构成了在高频地波舰载OTH雷达系统中对海浪杂波特性和目标特性进行分析和研究及在展宽的一阶Bragg海浪谱中实现舰船目标分辨与检测的重要理论基础.文章最后通过对实测数据的分析与测量,证明了所得出的数学关系式的正确性.Based Upon the physical model of back-scatting signals in Ship-Borne Surface Wave Radar（SBSWR）,the spectrum broadening equation of the echo signals in SBSWR,which reveals the relations among the movement of radar platform,the radar system parameters,the target physical attributes and target moving characteristics,is theoretically formulated in the terms of Doppler frequency.The influence of a moving radar platform on the high frequency phases of the radar echoes and on the Doppler spectrum structures of the echoes are analyzed in detail. The dynamic geometrical relations embedded between the moving radar platform and the targets with different physical dimensions and with different moving states are given. In addition, the expressions of the broadening spectrum of the signals from the static targets and the moving targets are presented respectively. These essential relations lay a theoretical basis for analyzing the chalacteristics of sea clutter and of targets,and for resolving the targets from the broadened first order Bragg lines in SBSWR as well. Finally, the correctness of the mathematic expressions presented in the article is proved by the data gathered from a preliminary field experiment which is conducted to evaluate and demonstrate several aspects of the SBSWR in September 8 1998.

关 键 词：舰载SWR 展宽谱 一阶Bragg海浪 展宽谱中的信号分辨 

分 类 号：TN959.72[电子电信—信号与信息处理] TN957.51[电子电信—信息与通信工程]