二次雷达异步干扰抑制  

Asynchronous interference suppression for secondary surveillance radar

作　　者：卢从慧[1] 李玉书[2] 吴乐南[1] 

机构地区：[1]东南大学信息科学与工程学院,江苏南京210096 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《电波科学学报》2014年第6期1081-1087,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.61271204)"独占加共享的频谱划分模式与高效传输体制"(6504000089)

摘　　要：针对两部二次雷达询问机触发同一个目标应答机时各雷达接收机测距的异步干扰和多应答信号回波混叠的问题,在现有的雷达脉冲宽度内引入扩展的二元相移键控作为载波相位调制方式,计算了单部二次雷达脉冲测距的克拉美-罗下限与最大似然估计值,分析并仿真了多回波混叠时编码系统的检测性能.理论与仿真结果表明,两部询问机在不同时延时总体测距精度非常接近单个询问机,有效抑制了异步干扰.The asynchronous interference and multi-echo aliasing exist when two second- ary surveillance radar （SSR） interrogators trigger a same target transponder. By carrier phase encoding and modulating within the existing SSR pulse using the extended binary phase shift keying（EBPSK）, the Cramer-Rao lower bound and maximum likelihood esti- mation of a single SSR ranging are derived. And the detection performance in multi-echo response aliasing circumstance is analyzed and simulated. It indicates that when two SSR in- terrogators work in different time delay, the overall range accuracy is very close to that of a single interrogator, and the asynchronous interference is effectively inhibited.

关 键 词：二次监视雷达 扩展的二元相移键控 异步干扰 测距 信号检测 

分 类 号：TN958.96[电子电信—信号与信息处理]