Single snapshot signal subspace method for target location

A signal subspace approach is developed for the passive sensing problem of locating radiation-emitting point sources from a single statistical realization or snapshot of the superposed radiation as detected at a receiving antenna array, and for the active sensing problem of locating point scatterers or "targets" from the multistatic response matrix (MRM) of the targets as measured either by a coincident array of "same transmit/same receive" antennas or by a non-coincident array where different elements are used for transmit and receive. Two applications are emphasized: (1) passive location of M\n\n\t\t