File list (Check if you may need any files):
Non_manuver_4targets_PHD
........................\Hungarian.m
........................\Wasserstein_Distance_new.m
........................\ceshipdf.m
........................\gauss_pdf.m
........................\gauss_rnd.m
........................\main.m
........................\min_line_cover.m
........................\schol.m
........................\step1.m
........................\step2.m
........................\step3.m
........................\step4.m
........................\step5.m
........................\step6.m
........................\usual_2_all.m
........................\说明.txt