利用非合作信号无源雷达技术的研究

【作者】 王宁；

【导师】 陆锦辉；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2008， 硕士

【摘要】 无源雷达是一种新体制雷达,它本身并不发射电磁波,而是借助空中已有的各种电磁波信号来检测目标,因而在现代电子战中具有重要意义。本文通过分析和比较各种卫星信号的具体参数,包括载波频率、调制方式、码率等,确定有利于目标成像和系统优化设计的信号作为外辐射源信号,并在双基地雷达理论的基础上,从能量、距离、多普勒等方面分析了GPS信号的性能。然后利用基于GPS卫星作为辐射源的无源定位体制,研究了该体制下的最大探测距离和信号杂波功率比,并给出了定位算法。最后通过选取最优算法,对目标进行成像和跟踪,从而确定系统工作体制。根据GPS目标信号在大地测绘中的应用,本文探讨了双基地合成孔径雷达成像算法在适当情况下的成像可行性,并在此基础上建立了被动目标的运动模型,比较了线性和非线性跟踪方法在无源雷达体制下的性能,结果表明非线性滤波算法较适合于该雷达体系。更多还原

【Abstract】 The passive radar is a new radar which emits nothing but can detect objects with the help of outer electromagnetic waves. So it plays an important role in modern ECM.By analysing and comparing parameters of satellite signals, including carrier frequency, modulation, code sampling and so on, the dissertation ascertains the illuminating sources, which could be propitious to imaging and system designing. On the theory of bistatic radar, the research reveals the merits of GPS signal in terms of energy, range and doppler resolution. Then the maximum detection range and the clutter to reflected signal ratio(in dB) are investigated in the mode of passive location, which takes GPS as the illuminator, while the location algorithm is detailed. Upon choosing the propest arithmetic for targets imaging and tracking, we completes the methods of the whole system finally.According to the applications of geodesic surveying, this thesis studys the possibility of bistatic synthetic aperture arithmetic in relevant cases, and sets up models of passive moving points. The results show that non-linear filtering arithmetic is mostly suitable in such passive situation by evaluating the performances of linear and non-linear filtering tracking methods.更多还原