FFT-based aperture monitor for scanning phased arrays

Details FFT-based aperture monitor for scanning phased arrays FFT-based aperture monitor for scanning phased arrays

1989-03-20

1990-05-15

Blum, Theodore M.

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

Directive

Including antenna pattern plotting

342173, H01Q 300

Patent

active

049261860

ABSTRACT:
Method and means for monitoring the performance of a phase array antenna. The antenna comprises an array of individual radiating element seach of which radiates a prescribed proportion of the energy to be transmitted thereby shaping such energy into a beam. Individual phase shifters are associated with each radiating element, the phases of which control the direction of the beam pointing. The method of the invention involves sampling the beam by means including a single receiver located along a fixed radial from the array. The beam scans at a constant rate. The samples are collected at non-uniform intervals of time during a beam scan. The samples are, however, separated by equal increments of arcsine .theta., where .theta. is the pointing angle of the beam. The samples are analyzed by means including a Fourier transform to provide the value of the amplitude and phase of the signal radiated by each of the radiating elements. Comparison of the amplitude and phase values for each radiating element as determined by analysis with design values for each element reveals any element or phase shifter which may be faulty. The method can also be used to calibrate an antenna when it is first put into service.

REFERENCES:
patent: 4488155 (1984-12-01), Wu

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