| 摘要 |
Digital beamfonning is provided for use with electronically scanned radar. In an aspect, the present invention provides enhanced sensitivity, wide angle or field of view (FOV) coverage with narrow beams, minimized number of receivers, reduced sidelobes, eliminated grating lobes and beam compensation for target motion. In an aspect, the present invention employs a uniform overlapped subarray feed network (420), a time multiplexed switch matrix (424), and a restructured digital signal processor (430). Antenna channels share a receiver (406), rather than maintain a dedicated receiver for each antenna element, as in conventional systems. In an aspect, Doppler/frequency filtering (432) is performed on each antenna element or subarray output prior to digital beamforming (436). Further, Doppler compensation (434) is employed following Doppler/frequency filtering (432), followed by digital beamforming (436). |
