Method for finding defective active array modules using an FFT o

Details Method for finding defective active array modules using an FFT o Method for finding defective active array modules using an FFT o

1990-05-31

1992-06-16

Sotomayor, John B.

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

Testing or calibrating of radar system

By monitoring

342372, 342174, G01S 740

Patent

active

051228068

ABSTRACT:
All modules of an active antenna array with the exception of a module under test are disabled. Samples representative of the output of the transmit and receive phase shifter outputs of the module under test are taken for successive pairs of transmit/receive modes of operation at the N successive phase increments of the module under test. Fast Fourier transforms (FFTs) are performed over the samples separately for transmit and receive states, and the power in each FFT filter for each state is detected. Power comparison between the power in filter 1 (numbered from 0) and the power in the sum of filters 2 through (N-1) is then used to determine whether the module under test is defective.

REFERENCES:
patent: 4488155 (1984-12-01), Wu
patent: 4622556 (1986-11-01), Bryant et al.
patent: 4768035 (1988-08-01), Thurber et al.
patent: 4926186 (1990-05-01), Kelly et al.
patent: 4940985 (1990-07-01), Taylor, Jr. et al.
patent: 4947176 (1990-08-01), Inatsune et al.

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