针对主瓣波动的阵列赋形方向图设计

Design of Array Shaped Pattern Aiming at Mainlobe Fluctuation

赋形方向图设计在阵列雷达中有重要应用,本文针对现有方法所设计波束主瓣存在波动的情况,提出一种最大匹配误差最小化的方向图设计方法。首先基于方向图匹配模型,从优化的角度对迭代FFT方法进行了分析;建立了方向图最大匹配误差最小化模型,并采用序列二次规划对发射权向量的相位进行优化;最后对余割平方的赋形方向图和展宽波束进行了实验仿真,对相控阵体制和MIMO体制下设计的方向图进行了比较,以迭代FFT所设计的方向为初始点,然后采用最大匹配误差最小化的方法对波束主瓣波动进行抑制。仿真结果说明了算法的有效性。

Shaped pattern design plays an important role in array radar. A pattern design method with pattern maximum matching and minimized error is presented on basis of fluctuation existing on the design beam main lobe by using availa- ble method. Firstly, on basis of pattern matching model, iteration FFI＂ method is analyzed from optimizing point of view; a model with pattern maximum matching and minimized error is set up, and sequential quadratic programming is employed to optimize phase of tramsmitting weight vector; and finally, the pattern and strech beam shaped with conse- cant squared is simulated; and the pattern in phased array and MIMO system are compared, taking direction designed with iteration FFT as initial point, then employment of pattern maximum matching and minimized error method to supress beam mainlobe fluctuation. The simulation result shows effectiveness of algorithm.