宽带卫星通信系统中强干扰抵消方法

摘要

In a strong interference environment,considering the data spilling of the Analog to Digital Con-verter( ADC) in satellite digital channelizer will severely degrades the system performance. This paper pro-poses a method of strong interference suppression for broadband satellite communication. Firstly,strong in-terference detection,extrication,and phase amplitude adjustment techniques are adopted in digital field. Then,the strong interference cancellation is performed in the analog field. Finally,the cancellation effect is confirmed by employing detection feedback. The design approaches and implementation procedures for the extraction filter in digital field are provided. Moreover,according to engineering practice,a filtering method based on mathematical morphology is presented to eliminate the effects caused by noise floor fluctuation in broadband satellite communication. Theoretical investigation and simulation results demonstrate that the proposed method can suppress the strong interference effectively.%在强干扰环境下，星上信道化器的关键部件模数转换器( ADC )会发生数据溢出，严重影响星上载荷转发性能。为此，提出了一种基于抵消思路的宽带卫星通信系统中强干扰抑制方法。该方法首先在数字域对强干扰进行检测、提取和相位幅度调整，然后在模拟域进行强干扰抵消，最后通过检测反馈保证抵消效果。给出了数字域提取滤波器的基本设计方法和实现步骤，并且结合工程实际，采用数学形态学滤波方法消除卫星宽频带噪底起伏带来的影响。研究与仿真结果表明，该方法能对强干扰进行有效抑制。