HOW THE PHASED ARRAY IS STEERED Inputs to the X and Y microprocessors from the ground-based interferometers and the air vehicle - based position sensors are used to generate incremental phase shifts "a" and "b" which must occur between successive columns and rows of radiating elements to steer the beam. These incremental phase shifts in digital form are multiplied by an integral number corresponding to the position of the row or column of the processing elements Q located along the X and Y axes. The resulting phase shifts in digital form are sent along the respective rows and columns. Another processing element □ located m each radiating element adds the two incoming phase shifts according to the relationship ma + nb where "m" is the number of the column and '• n" is the number of the row. The resulting digital signal is converted to an analog phase by means of a low-power 4-bit phase shifter and added to the "clock" or "bore-sighted" reference phase to provide a new reference phase by which the phase of the power emitted from the radiating element is controlled by means described elsewhere.
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