Systems and methods for direction finding using augmented spatial sample covariance matrices

A system comprising:

• a plurality of subarrays, each of the subarrays having an output port;
• a radio frequency (RF) receiver having one or more receiver channels, wherein the number of subarrays is greater than the number receiver channels;
• and
• a switch network having a plurality of input ports with each input port coupled to an output of one or more respective ones of said plurality of subarrays and having output ports with each switch output coupled to an input of respective one of the one or more receiver channels, said switch network operable to switch between different groups of subarrays at different dwell times such that at least one group of subarrays is configured to provide signals to the receiver channels;
• a direction finding processor coupled to receive signals from said RF receiver during a selected one of a plurality of dwell times.