【作者】 王李军；

【导师】 赵惠昌；

【作者基本信息】 南京理工大学 ， 机械电子工程， 2006， 博士

【摘要】 未来战争的形态将是高科技的“数字化战争”，而先进的导航定位技术是“数字化战争”的重要保证。作为一种通用的定位系统，GPS具有许多其它导航设备无可比拟的优越性，人们对其重视程度也日益提高。因此，不仅要研究GPS的干扰技术，使对方的先进设备不能发挥作用，而且也要重点研究先进的抗干扰设备，以适应现代化信息战的需要，这对现代化武器性能的提高、乃至整体战斗力的增强都将有非常重要的意义。 本文着重研究了GPS接收机的若干抗干扰技术，并对其进行了详细地分析和讨论；同时研制了一套GPS干扰抗干扰仿真实验系统，为GPS接收系统的对抗研究提供实验平台。本文的研究成果对通信对抗、雷达对抗以及引信对抗都有重要的参考价值。本文的主要工作包括一下几个方面的内容： (1) 建立了基于软件无线电设计思想的GPS接收机抗干扰接收系统模型，定性分析了常见干扰信号(包括连续波、AM-FM干扰、扩频信号以及噪声)对GPS接收机输出误码率的影响。 (2) 详细分析了子空间投影技术抑制GPS信号中AM-FM干扰信号的可行性和有效性，并详细推导了子空间投影技术在AM-FM干扰参数存在估计误差时的输出SINR性能。提出了基于时频分析和子空间投影技术相结合的GPS抗干扰设计方案，并分析了它的抗干扰性能。 (3) 将自适应波束形成技术与软件GPS接收机的设计思想结合起来，提出了系统的设计方案，并对其进行了详细的仿真分析，研究了自适应波束形成技术抑制相干和非相干干扰的性能，对比分析了基于空间平滑技术和Toeplitz方法解相干的性能，并将二者应用到GPS相干干扰的抑制中。给出了基于频域和空域的联合抗干扰技术的设计方案，并仿真分析了它的可行性和有效性。 (4) 设计了一套中频信号干扰和抗干扰硬件仿真实验系统，系统可以采集存储GPS中频信号，然后传送给计算机，借助于现有的软件开发或仿真工具，采用本文提出的算法对其进行分析。为GPS接收机干扰和抗干扰技术的研究和应用提供一个实验平台。更多还原

【Abstract】 The pattern of the future war will be "digital war" on basis of the high-tech, and the advanced navigation and positioning technology is important guarantee to "digital war". GPS is a universal positioning system, which has unexampled superiority relative to others navigation devices. It has arrested more and more people’s attention. The key problem of the study lies in: how to make use of GPS for oneself effectively and destroy or jam it so that the other side can’t use it. Only by this can adapt to the requirement of the modernization information war. And it is very significant to improve the performance of modernization weapon and enhance the whole battle effectiveness.This dissertation fastens one’s attention upon the study of GPS anti-jamming techniques. Several schemes are put forward, whose performance is analyzed and discussed in detail. At the same time, the simulation system of jamming and antijamming for GPS receivers is developed, which provides an experiment platform for the study of GPS countermeasures. The productions obtained from this dissertation have much reference to the communication countermeasures, radar countermeasures and fuze countermeasures. The main contributions are as follows:(1) The system model of GPS anti-jamming receiver based on software radio is built. The output BER performance of GPS receivers with jamming signals (including CW jamming, AM-FM jamming, correlative jamming and noise jamming) is analyzed and simulated.(2) The feasibility and validity that subspace projection technique suppresses AM-FM jamming signal in GPS receivers is analyzed detailedly. The output SINR performance of AM-FM jamming parameters with estimation errors is deduced. The design scheme of GPS anti-jamming receiver based on time-frequency analysis and subspace projection technique is put forward, whose anti-jamming performance is analyzed and simulated.(3) The system scheme combining adaptive beamforming and software GPS receivers is brought forward, whose performance is analyzed and simulated detailedly.更多还原