| 摘要 |
From an antenna array of a plurality of fixed, narrow beamwidth antennas, geographically oriented to provide omnidirectional coverage, a set of antennas is selected. The selected set includes first and second oppositely oriented pairs of adjacent antennas. The signals received by the adjacent antennas in each selected pair are connected to the inputs of different pairs of matched receiver channels. The logarithmic video output signals from the receiver channels in each pair are subtracted to simultaneously generate first and second monopulse ratios. The monopulse ratios are compared and the ratio representing the forelobe response is selected while the ratio representing the backlobe response is suppressed. If certain acceptance rules are met, the selected ratio is processed to obtain unambiguous angle of arrival information with instantaneous angular coverage over the monitored sector. The array is electronically scanned by a controlled switching system which causes successive antenna sets to be selected, in sequence. Successive selection of the antenna sets in sequence provides a 360 DEG total field of view.
|
