针对雷达干扰机收发天线之间存在的同频干扰问题,文中研究了基于变步长仿射投影(VSSAP)算法的自适应干扰对消技术。该算法针对仿射投影(AP)算法的定步长因子进行改进,建立了以高斯分布函数为基础改进的步长函数,同时 利用误差信号的自相关作为步长函数的自变量,得到步长因子随误差信号变化的函数表达式,从而在加快算法收敛速度的同时改善稳态误差。最终的实验结果证明:该算法的收敛速度和稳态误差明显优于最小均方误差(LMS)及其改进算 法,且与参考算法相比,收敛速度大大加快,对消比提高了10dB左右。在转发式雷达干扰机中,欺骗干扰与压制干扰得到有效抑制,使得目标信号得以较好还原。

Aiming at the problem of co-frequency interference between the transmitting and receiving antennas of the radar jammer, in this paper the adaptive interference cancellation technology based on the variable step size affine projection (VSSAP) algorithm is studied. The algorithm is improved for the fixed step factor of AP algorithm, of which the step function is improved based on the Gaussian distribution function. At the mean time, the algorithm uses the autocorrelation of the error signal as the independent variable of the step size function to obtain the function expression, thereby the convergence speed of the algorithm is accelerated, as well as the steady-state error is improved. The experimental result proves that the convergence speed and steady-state error of the algorithm are significantly better than least mean square (LMS) algorithm and its series algorithm. Compared with the reference algorithm, the convergence speed is greatly accelerated and the cancellation ratio is also improved by about 10 dB. In the repeater radar jammer,deception jamming and suppression jamming are effectively suppressed, so that the target signal can be better restored.

TN974

国家自然科学基金资助项目(62071137)