本文係作二維陣列天線強健式零化延展之研究,吾人採用Howells-Applebaum作法以決定最佳權重矩陣。經系統提供目標及干擾源的方位資訊後,即可得出最佳權重矩陣,它可以控制天線場型使得主波束對準目標,零點對準干擾源。當系統沒有零點控制的需求時,即刻回到對目標方位的場型合成作法。另為了簡化逆矩陣求解的複雜運算程序,吾人加入特徵分析及保留主項法,並對於零點加寬的作法加以研究分析,最後透過MATLAB推演分析,分別在一維及二維天線陣列條件下,進行模擬與驗證,證明此一強健式零化程序具有重要價值,可供未來主動相列雷達研發參考運用。
In this paper, a multiple null algorithm that can be adjust the number, width and depth of multiple nulls in according with the requirements is presented for the improvement of the interference cancellation capability of two dimensional array antennas. The Howells-Applebaum algorithm, Eigen value decomposition (EVD) and principal component methods are employed to robustly simplify the computation of inverse interference covariance matrix and determine the optimal weighting matrix of the multiple null digital beam former (DBF). If there is no jamming occurred, the DBF recovers to its normal pattern. Final, the numerical simulations of the multiple null DBF are used to demonstrate its anti-jamming capability for the two dimensional array antennas.