Abstract: A beam steering or scanning system comprising a plurality of groups of radiating elements each group of which is connected to a controllable array signal distribution means which is itself a plurality of phase shifters and/or timing delays or sequences appropriately weighted hereinafter referred to as the array beam former the spacial directional beams being generated and scanned by controlling the array beam former while contemporaneously controlling a sub-array beam forming system forming part of the beam steering system so as to modify the sub-array factors as well as the array factor whereby a resultant beam configuration is produced in which grating lobes are obviated or at least significantly suppressed.

Abstract: A system of operation for a scanning beam microwave landing system having aerial means for scanning a narrow microwave beam TO and FRO through a scanned angular sector and for transmitting OCI signals with a relatively wider beam pattern to cover OCI sectors to the left and to the right of the scan sector comprising, energizing the aerial means before the TO scan begins to produce the said wide beam pattern on the left of the scanned sector at a time corresponding to a predetermined negative angle of the TO scan with reference to the center line of the scanned sector and which is outside the angular limit of the scanned sector, energizing the aerial means after the TO scan finishes to produce the said wider beam pattern on the right of the scanned sector at a time corresponding to the said predetermined angle of the TO scan but positive with respect to the center line through the scanned sector, and outside the angular limit of the scanned sector, energizing the aerial means before the FRO scan begins to prod

Abstract: A system of operation for a scanning beam microwave landing system having aerial means for scanning a narrow microwave beam TO and FRO through a scanned angular sector and for transmitting signals with relatively wider beam patterns to cover sectors to the left and to the right of the scanned sector comprises, energizing the aerial means before the TO scan begins to produce the said relatively wider beam pattern on the left of the scanned sector at a time corresponding to a predetermined negative angle of scan with reference to the center line of the scanned sector which is outside the angular limit of the scanned sector, energizing the aerial means after the TO scan finishes to produce the said wider beam pattern on the right of the scanned sector at a time corresponding to the said predetermined angle of scan but positive with respect to the center line through the scanned sector which is outside the angular limit of the scanned sector, energizing the aerial means before the FRO scan begins to produce the s