基于阵列天线的改进步长抗干扰算法

在空间电磁对抗环境错综复杂的情形下，所接收的导航信号很容易被干扰，信号极易因被干扰而无法正常接收。针对以上问题，基于阵列天线，对抗干扰算法进行了研究，为简化运算，避免求逆问题，提出迭代逼近的方法对权值进行更新。针对固定步长在权值收敛时的局限性，为了改善算法的动态输入范围，提高收敛速度，提出了一种新的变步长的功率倒置算法。该算法以输入信号的瞬时能量值为基础构造步长的更新模型，有效解决了因步长选取不当产生的矛盾问题。仿真实验表明，相比较于固定步长的抗干扰算法，本文所提的变步长算法可以有效提高权值收敛速度，并对干扰形成更深的零陷，具有较好的干扰抑制能力。

An Improved Step Size Anti-jamming Algorithm Based on Array Antenna

In the complicated environment of space electromagnetic countermeasures, the received navigation signals are easily disturbed, and the signals are easily disturbed and cannot be received normally. In response to the above problems, based on the array antenna, anti-interference algorithms are studied. In order to simplify the calculation and avoid the inversion problem, an iterative approximation method is proposed to update the weights. Aiming at the limitation of the fixed step size when the weights converge, and in order to improve the dynamic input range of the algorithm and increase the convergence speed, a new variable step size power inversion algorithm is proposed. The algorithm constructs an updated model of the step length based on the instantaneous energy value of the input signal, which effectively solves the contradiction problem caused by improper selection of the step length. Simulation experiments show that, compared with the anti-interference algorithm with fixed step size, the variable step size algorithm proposed in this paper can effectively improve the convergence speed of weights, form a deeper null for interference, and has better interference suppression capabilities.