西北工业大学学报
西北工業大學學報
서북공업대학학보
JOURNAL OF NORTHWESTERN POLYTECHNICAL UNIVERSITY
2014年
4期
586-592
,共7页
潘浩%孙超%卓颉%刘雄厚
潘浩%孫超%卓頡%劉雄厚
반호%손초%탁힐%류웅후
水下声成像%MIMO声呐%稀疏阵列%模拟退火算法%虚拟阵列%匹配滤波
水下聲成像%MIMO聲吶%稀疏陣列%模擬退火算法%虛擬陣列%匹配濾波
수하성성상%MIMO성눌%희소진렬%모의퇴화산법%허의진렬%필배려파
为了降低多输入多输出( multiple-lnput multiple-output,MIMO)声呐二维成像系统的运算量,提出了稀疏阵列和MIMO声呐相结合的低运算量二维成像方法。在MIMO声呐的虚拟接收阵列为矩形平面阵的前提下,使用模拟退火算法( simulated annealing,SA)对该虚拟矩形平面阵的阵元位置和加权系数同时优化,在保持期望波束性能的前提下大量减少其虚拟阵元数目;根据虚拟接收阵元与匹配滤波器一一对应的关系,移除掉与关闭虚拟阵元所对应的匹配滤波器;对保留匹配滤波器的输出信号进行波束形成等处理,获得目标的二维强度图。计算机仿真结果验证了该方法的有效性。
為瞭降低多輸入多輸齣( multiple-lnput multiple-output,MIMO)聲吶二維成像繫統的運算量,提齣瞭稀疏陣列和MIMO聲吶相結閤的低運算量二維成像方法。在MIMO聲吶的虛擬接收陣列為矩形平麵陣的前提下,使用模擬退火算法( simulated annealing,SA)對該虛擬矩形平麵陣的陣元位置和加權繫數同時優化,在保持期望波束性能的前提下大量減少其虛擬陣元數目;根據虛擬接收陣元與匹配濾波器一一對應的關繫,移除掉與關閉虛擬陣元所對應的匹配濾波器;對保留匹配濾波器的輸齣信號進行波束形成等處理,穫得目標的二維彊度圖。計算機倣真結果驗證瞭該方法的有效性。
위료강저다수입다수출( multiple-lnput multiple-output,MIMO)성눌이유성상계통적운산량,제출료희소진렬화MIMO성눌상결합적저운산량이유성상방법。재MIMO성눌적허의접수진렬위구형평면진적전제하,사용모의퇴화산법( simulated annealing,SA)대해허의구형평면진적진원위치화가권계수동시우화,재보지기망파속성능적전제하대량감소기허의진원수목;근거허의접수진원여필배려파기일일대응적관계,이제도여관폐허의진원소대응적필배려파기;대보류필배려파기적수출신호진행파속형성등처리,획득목표적이유강도도。계산궤방진결과험증료해방법적유효성。
To reduce the computation burden of multiple-input multiple-output ( MIMO) sonar imaging system, a low computational imaging approach based on sparse array technology is proposed in this paper. Specifically, con-sidering the MIMO sonar with a virtual rectangular planar array, we adopt the simulated annealing ( SA) algorithm to optimize the layout and weight coefficients of the virtual array into a sparse one. Then, according to the one-to-one relationship between a matched filter and a virtual sensor, the matched filters whose corresponding virtual ele-ments are inactive in the virtual array are also removed. Finally, the outputs of remaining matched filters are col-lected as the inputs of beamformers and the 2-D imaging result is obtained with further processing. Since the sensor number in the sparse virtual array is much smaller than that of the original filled virtual one, the number of matched filters in the MIMO sonar imaging system is greatly reduced and hence, the computation burden is significantly sim-plified. Numerical simulations are provided for demonstrating the effectiveness of our approach.