Automatic phase alignment system for a tracking antenna

Details Automatic phase alignment system for a tracking antenna Automatic phase alignment system for a tracking antenna

1980-09-09

1982-09-07

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 16M, 343 177, 3431145, 343116, 343117R, G01S 502, G01S 740, G01S 1300

Patent

active

043486762

ABSTRACT:
The tracking signals of a monopulse satellite tracking system are optimized by aligning the phases of the azimuth and elevation channels (the "difference" channels) with the reference (or "sum") channel using an autophase controller and a simulated far field source in the near field. The autophase controller monitors the output of the tracking receiver and adjusts phase shifters along the transmission paths of the azimuth and elevation channels, in a manner to maximize the outputs of the receiver. The simulated far field source provides an alignment signal for the autophase controller. The simulated far field source consists of a signal generator, a near field probe, and near field phase compensators. The probe is positioned to avoid any nulls in the simulated tracking signal for the frequencies of interest. The probe is also positioned to limit the range of the phase shifts introduced by near field placement, for the frequencies of interest. Near field phase shift compensators are used to offset the phase shifts introduced by the use of a near field source instead of a far field source.

REFERENCES:
patent: 2861177 (1958-11-01), Dishal et al.
patent: 3196433 (1965-07-01), Barton et al.
patent: 3221328 (1965-11-01), Isch
patent: 3582950 (1971-06-01), Tanaka et al.
patent: 3821741 (1974-06-01), D'Oro et al.
patent: 3842420 (1974-10-01), Rabow
patent: 3883870 (1975-05-01), Kunz
patent: 4030099 (1977-06-01), Valenti et al.

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