计算机仿真
計算機倣真
계산궤방진
COMPUTER SIMULATION
2014年
5期
197-200,213
,共5页
宽带聚焦波束形成%最佳聚焦频率%稳健波束形成算法
寬帶聚焦波束形成%最佳聚焦頻率%穩健波束形成算法
관대취초파속형성%최가취초빈솔%은건파속형성산법
Broadband focused beam-forming%Optimal focusing frequency%Robust beam-forming algorithm
研究了宽带聚焦波束形成的优化问题。由于在宽带聚焦波束形成算法中，聚焦矩阵直接决定着波束形成的效果，在确定聚焦矩阵时对初始方向估计的偏差以及选择的聚焦频率都会直接影响到最终的聚焦效果，严重时还会致使算法失效。针对这个缺陷，提出了一种改进的宽带聚焦波束形成算法。通过稳健Capon波束形成算法校正聚焦矩阵，并且利用校正的聚焦矩阵使宽带信号的各个子带信号全部聚焦在确定的最佳聚焦频率上。仿真结果表明，通过改进算法得到的宽带聚焦波束，主瓣更加恒定，旁瓣级更低，验证了算法的有效性。
研究瞭寬帶聚焦波束形成的優化問題。由于在寬帶聚焦波束形成算法中，聚焦矩陣直接決定著波束形成的效果，在確定聚焦矩陣時對初始方嚮估計的偏差以及選擇的聚焦頻率都會直接影響到最終的聚焦效果，嚴重時還會緻使算法失效。針對這箇缺陷，提齣瞭一種改進的寬帶聚焦波束形成算法。通過穩健Capon波束形成算法校正聚焦矩陣，併且利用校正的聚焦矩陣使寬帶信號的各箇子帶信號全部聚焦在確定的最佳聚焦頻率上。倣真結果錶明，通過改進算法得到的寬帶聚焦波束，主瓣更加恆定，徬瓣級更低，驗證瞭算法的有效性。
연구료관대취초파속형성적우화문제。유우재관대취초파속형성산법중，취초구진직접결정착파속형성적효과，재학정취초구진시대초시방향고계적편차이급선택적취초빈솔도회직접영향도최종적취초효과，엄중시환회치사산법실효。침대저개결함，제출료일충개진적관대취초파속형성산법。통과은건Capon파속형성산법교정취초구진，병차이용교정적취초구진사관대신호적각개자대신호전부취초재학정적최가취초빈솔상。방진결과표명，통과개진산법득도적관대취초파속，주판경가항정，방판급경저，험증료산법적유효성。
The optimization problem of broadband focusing beam-forming was studied in this paper. Because fo-cusing matrix directly determines the performance of the beam forming in the broadband focusing beam-forming algo-rithm, the deviation of initial direction estimation in determining the focusing matrix as well as the choice of the focu-sing frequency all can directly affect the focusing effect, and even lead to algorithm failure. To solve this problem, this paper presented an improved broadband focusing beam-forming algorithm which uses the robust Capon beam-forming algorithm to calibrate the focusing matrix and makes each sub-band signal focusing on the optimal focusing frequency. Computer simulation shows, the broadband focusing beam has more constant main valve and lower side lobe level by using the improved algorithm proposed in this paper, which verifies the validity of the algorithm.
