基于信号强度多波束空间分布的干扰源单星定位方法研究

Satellite communications system is always disturbed by jams and inferences. However, there is lots of factors restricting interference localization in satellite communications system because the system is not designed for Location–Oriented. The project will focus on the issue of interference localization in satellite communication with multi-beam antenna. Due to the fact that it is difficult to meet the requirement for the number of satellite up to two or further, we will propose a novel way for inferring position of interference for the system only hold single satellite. Taking use of signal strength in individual beam is different with each other for the system with multi-beam antenna, the project will pay attention to items as following, format the model of antenna gain projection to the earth surface, propose interference localization algorithm based on antenna gain and signal strength, develop localizing systems without other assisted facility and disruption of normal operation, analyze position precision which deteriorated by a lot of factors, present compensation for position error. Interference localization in single satellite system, which is the key scientific problem, will make contribution to support discover interference and anti-jamming decision in satellite mobile communications.

卫星通信系统容易受到各种有意或无意的干扰，由于不是面向定位设计，其中的干扰源定位受到诸多不利因素的限制。本课题针对多波束卫星通信系统中的干扰源定位问题，利用多波束天线各邻近波束在不同干扰源位置上具有不同增益的特点，构建星载多波束天线方向图的地面投影模型，提出基于天线增益和信号强度空间分布的定位算法，实现不依赖邻星和其他星载设备的干扰源单星定位，并通过分析各种因素对定位精度的影响给出相应的误差修正方法，提高定位精度。通过本课题研究，提出的干扰源定位方法能够减小对系统正常运行的影响，降低对外部条件的要求，有助于系统的干扰排查和抗干扰决策制定，该方法也可应用于其它通信卫星和电子侦察卫星的辐射源定位。

面对复杂的电磁环境，采用星载多波束天线的卫星通信系统容易受到各种有意或无意的干扰，造成诸多恶劣的影响和经济上的损失。为了确保卫星通信系统正常运行，需要快速找出干扰源的位置，并将其排除。本课题针对多波束卫星通信系统中的干扰源定位问题展开研究，包括定位方程组的建立求解与精度分析、干扰信号的检测和识别、以及信号参数估计。. 首先，提出基于天线增益和信号强度空间分布的定位算法，实现不依赖邻星和其他星载设备的干扰源单星定位，并通过分析各种因素对定位精度的影响给出相应的误差修正方法，提高定位精度；其次，提出了使用形态滤波的窄带干扰检测方法，以及自适应音频干扰检测方法；最后，研究了基于信号互模糊函数的卫星通信小信号检测方法，以及实现了基于循环频率截面上进行谱峰搜索的微弱信号的检测。