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To estimate the coordinates of multiple targets, the arrangement of radar sensors is very important. This paper uses four Ultra Wide Band (UWB) radar modules at four directions in the room. In multiple targets, there is some probability to choose "ghost" targets (Helmbrecht and Biebl, 2005) when targets are on the diagonal. This paper proposes modified UWB radar module to install radar modules at two opposite sides of the room. The problem of diagonal situation could be solved by complementary cooperation of these two radar modules. It could be improved by using the relative error from the opposite module. This paper verifies the perfomance of each method by simulation.