Direction finding with compensation for a near field scatterer

The effect of a near field scatterer on direction finding and its reduction is considered. The effects of a scatterer in the near field of an antenna array are modeled. It is shown that the scatterer degrades the ability of the MUSIC algorithm to resolve two plane waves with a small angular separation. A technique is presented to suppress the effects of the near field scatterer. With this technique, it is shown that the MUSIC algorithm can be applied in the usual manner after applying the Mahalanobis transformation and altering the search vector. It is shown that the effects of an uncoupled scatterer in the near field of the antenna array can be virtually eliminated.