Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna pattern plotting
Patent
1991-04-12
1993-02-16
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna pattern plotting
342173, H01Q 300
Patent
active
051874865
ABSTRACT:
Landing aids using phased-array antennas must be very carefully calibrated. Conventional methods use probes which are inserted into each individual radiating element of the array antenna. For 6-bit phase shifters, this method is not suficiently accurate. A method and an apparatus are disclosed wherein the aperture illumination of the array antenna is determined from the output of an integral waveguide and compared with a desired aperture illumination. The difference between actual value and desired value is compensated for iteratively with the aid of an adaptive control system.
REFERENCES:
patent: 4453164 (1984-06-01), Patton
patent: 4488155 (1984-12-01), Wu
patent: 4520361 (1985-05-01), Frazita
patent: 4926186 (1990-05-01), Kelly, et al.
J. Ronen, "Monitoing Techniques for Phased-Array. . .", IEEE Trans. on Antennas and Propagation, vol. AP-33, No. 12, Dec. 1985, pp.1313-1327.
Rice et al., "Quadrature Sampling With High Dynamic Range", IEEE Transactions on aerospace and Electronic Systems, vol. AES-18 No. 4, Nov. 1982, pp. 736-739.
Blum Theodore M.
Standard Elektrik Lorenz Aktiengesellschaft
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