单通道盲源分离在低轨星座系统间干扰减缓中的应用

针对低轨星座系统间同频干扰问题，从信号分割角度，提出了基于单通道盲源分离的干扰减缓方法。该方法应用了单通道盲源分离算法，先通过奇异谱分析算法对地球站观测信号进行处理，构造多维轨迹矩阵；再利用快速固定点算法将干扰信号和受扰信号分离。以OneWeb和Starlink系统为例，通过所提方法将OneWeb地球站接收到的OneWeb、Starlink以及噪声的混合信号进行分解，并利用相关系数和均方根误差评估了方法的有效性。结果表明，原始信号与分离信号之间的相关系数都在0.8以上，所提方法能有效提取有用信号，减缓低轨星座系统间干扰。

Application of single channel blind source separation in interference mitigation among LEO constellation systems

For the problem of co-frequency interference among low Earth orbit(LEO) constellation systems,an interference mitigation method based on single-channel blind source separation is proposed from the perspective of the signal separation.First,the observation signal of the earth station is processed by the singular spectrum analysis algorithm to construct a multi-dimensional trajectory matrix.Then,the fast fixed point algorithm is utilized to separate the interference signals and the wanted signal.By taking OneWeb system and Starlink system as examples,the mixed signals of those systems and noise received by the earth station are decomposed by the proposed method,and the correlation coefficient and the root mean square error are used to verify the effectiveness of the method.The results show that the correlation coefficients between the original signal and the separated signal are all above 0.8.The proposed method can effectively extract the wanted signal,thus reducing the co-frequency interference among LEO constellation systems.