摘要
在SARBP(Back Project反向投影)成像算法的基础上,结合超宽带穿墙探测雷达应用中存在的特定条件(如墙体的反射、折射及其对宽带信号的色散影响,因天线阵的天线数目有限而使获得的信息量小等),提出了一种超宽带穿墙探测雷达的BP成像算法。该算法考虑了超宽带电磁波穿透墙体传播的特性,能够去除墙体对成像的影响,并有效抑制了天线阵天线数目较少时的拖尾现象。通过仿真成像,分析了合成孔径长度对可成像区域和成像精度的影响合成孔径长度增加,成像精度提高,而可成像区域减小。
A BP（Back Project） imaging algorithm for ultra-wideband through-wall detecting radar （UWB-TWDR） is presented by modifying the SAR BP imaging algorithm to adapt to the special conditions in UWB-TWDR. These conditions include reflection, refraction and chromatic dispersion of wideband signal generated by the wall and lack of information caused by limited number of antennas in the antenna array. The features of propagation of ultra-wideband electric-magnetic wave through wall are taken account in the algorithm, so the influence of wall could be removed, and the blur generated by limited antenna number is depressed effectively. Imaging results of simulation data are gived. The effect of the length of synthetic aperture on detecting scope and imaging precision is studied. With the increase of the length of synthetic aperture, the imaging precision increases, while the detecting scope decreases.
出处
《雷达科学与技术》
2007年第1期49-54,59,共7页
Radar Science and Technology
