Antenna geometry strategy with prior information for direction-finding MIMO radars

The antenna geometry strategy for direction finding(DF) with multiple-input multiple-output(MIMO) radars is studied.One case, usually encountered is practical applications, is considered. For a directional antenna geometry with a prior direction,the trace-optimal(TO) criterion(minimizing the trace) on the average Cram ′er-Rao bound(CRB) matrix is employed. A qualitative explanation for antenna geometry is provided, which is a combinatorial optimization problem. In the numerical example section, it is shown that the antenna geometries, designed by the proposed strategy, outperform the representative DF antenna geometries.