基于Welch谱估计和能量检测(ED)的干扰信号检测技术

Interference signal detection technology based on Welch spectrum estimation and energy detection(ED)

由于通信卫星直接暴露在自由空间中,因此很容易受到来自地面或者其他卫星转发器的有意或者无意的干扰,当卫星通信系统受到干扰时需要对干扰信号占据的频点位置进行检测。文章首先对能量检测法应用在干扰信号检测中的可能性进行论述,为干扰信号检测算法的设计奠定基础;其次对随机信号的三种功率谱密度估计技术做理论推导,以寻求最适用于干扰信号检测的谱估计技术;最后对吴珺[1-2]等人的工作做改进,设计基于Welch谱估计和能量检测的干扰信号检测技术,利用仿真实验对其检测性能进行分析。

Since the communication satellite is directly exposed to free space, it is susceptible to intentional or unintentional interference from the ground or other satellite transponders. When the satellite communication system is interfered, it is necessary to figure out frequency position that occupied by the interference signal. The article first discusses the possibility of applying energy detection method in interference signal detection, and lays a foundation for the design of interference signal detection algorithm. Secondly, three power spectral density estimation techniques of random signals are theoretically deduced to find the best spectral estimation technique for interference signal detection. Finally, the work of Wu Hao and others was improved. The interference signal detection technology based on Welch spectrum estimation and energy detection was designed, and the simulation performance was analyzed by simulation experiment.