Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1991-03-28
1993-03-16
Hille, Rolf
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343761, 343763, H01Q 300
Patent
active
051948745
ABSTRACT:
An integrated antenna system for signal error tracking and correction capable of performing a mechanical conical scan. The mechanical conical scan imposes a modulation upon a received RF signal. This modulation is in turn imposed on an AGC circuit in the receiver of the antenna system, which modulates the AGC signal of the receiver in accord with the modulation imposed on the RF signal by the conical scan. This modulated AGC signal is compared in a detector circuit to a reference sinusoidal signal generated by a local oscillator in the system. This detector circuit outputs an error signal which is added to a reference sinusoidal signal which in combination drive an actuator. This actuator is responsible for imparting nutative motion to the antenna, for the purposes of producing the conical scan pattern. The error detection and correction which result from the conical scan and the error detection circuitry, are capable of operating at multiple RF frequencies and modulation schemes, since the error signal of the system is generated by a modulated AGC signal as opposed to the modulated RF signal itself.
REFERENCES:
patent: 2934763 (1960-04-01), Hopkins
patent: 2954554 (1960-09-01), Feltham, Jr.
patent: 3745582 (1973-07-01), Karikomi et al.
Hille Rolf
Le Hoang-anh
Selenia Spazio S.p.A.
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