Near-field sensing using subspace techniques

摘要

Three techniques are studied for sensor array based pupil-plane imaging of point sources in the near field. Pupil plane imaging is a potential alternative in the absence of well-developed focal plane array technology. The techniques are sum and delay focusing, minimum variance distortionless response (NB/DR) focusing and subspace focusing. While the first has been widely proposed for usage, it is demonstrated here that the other two provide better resolution. Between the MVDR. and the subspace approaches, the latter potentially provides bet ter performance in noise.