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在基于非合作照射源的无源雷达系统中,对直达波的抑制是一项关键技术。非合作照射源发射的信号多为非平稳信号,传统方法最小均方算法收敛速度慢,不能适应上述信号的变化,降低系统性能。提出改进的归一化LMS算法,利用变步长技术,改善算法的收敛速度,进而提高了非平稳直达波和杂波的抑制性能。实测数据的处理和实际系统中的应用均验证了该算法的有效性。
In passive radar systems based on non-cooperative radiation sources, the suppression of direct waves is a key technique. The signals transmitted by non-cooperative illumination sources are mostly non-stationary signals. The traditional least-mean-square algorithm converges slowly and can not adapt to the above signal changes, reducing the system performance. An improved normalized LMS algorithm is proposed, which improves the convergence speed of the algorithm by using the variable step size technique and improves the performance of non-stationary direct and clutter suppression. The measured data processing and the practical application of the system verify the effectiveness of the algorithm.