Motion-Extended Extended Array Synthesis Synthesis—Part Part II: Experimental Validation
Abstract: The theory and method for motion motion-extended extended array synthesis (MXAS) are described by Kendra. The concept describes how MXAS, for a oneone or twodimensional synthetic array, is realized specifically without recourse to a reference waveform. The essential idea is that the relative motion between (a minimum of) two collection platforms with different velocity vectors can be exploited to create a virtual array, with the size of the virtual array being equivalent to the space swept out by the relative motion of the collectors. This paper describes a multistage experimental validation for MXAS, progressing from a “closed” (nonfree space) RF RF-domain domain test bed, to a highly controlled indoor indoo freespace prototype system, and finally to an outdoor, vehicle vehicle-based based prototype system. Key imaging principles validated include resolution performance relative to theoretical prediction; capability across a range of scenarios, including extreme near field, ld, multipath, and ultralow power; retention of array degrees of freedom for steering nulls; and satisfaction of system requirements for synchronization and precision using consumer off off-the-shelf components.