Digital beamforming for multiple independent transmit beams

Details Digital beamforming for multiple independent transmit beams Digital beamforming for multiple independent transmit beams

1989-10-17

1990-10-23

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

H01Q 322, H01Q 324, H01Q 326

Patent

active

049656023

ABSTRACT:
A phased array antenna system is disclosed which employs digital beamforming of multiple independent transmit beams. A waveform generator provides successive digitized time samples of a desired waveform, and the respective beamforming coefficients which produce the desired amplitude and phase distribution for each beam are applied to the waveform samples. The resulting digital samples are then mixed up to IF, converted to digital form, frequency converted to the desired RF frequency, amplified and passed to the respective antenna subarrays. The transmit system permits fine granularity phase control, providing accurate beamforming and positioning and improved sidelobe control.

REFERENCES:
patent: 4277787 (1981-07-01), King
"Digital Multiple Beamforming Techniques for Radar," Abraham E. Ruvin, Leonard Weinberg, IEEE EASCON '78 Record, pp. 162-163, Sep. 25-27, 1978, IEEE Publication 78 CH 1354-CH 1354-1355 AES.

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