Source-group method to speed up the reconstruction of objects from radar data by using the FBTS method

We have proposed a time-domain forward-backward time-stepping (FBTS) method for reconstructing 3D structures in highly absorptive media. The reconstruction speed is greatly dependent oil the number of transmitters. In this paper, we propose a source-group method to speed up the reconstruction. In the source-group method, multiple transmitters arranged at different positions are excited simultaneously and receivers collect the wave fields. To compare the reconstruction results, three kinds of reconstructions front 16 conventional single transmitter-multiple receiver data sets, four source-group multiple-receiver data sets, and four conventional single-transmitter multiple-receiver data sets are carried out. Reconstruction by the source-group method is several times faster than (and the reconstructed results are almost the same as) those of the first kind of reconstruction, and they arc much better than those of the third kind. (c) 2005 Wiley Periodicals, Inc.