Pointing error compensating device

Details Pointing error compensating device Pointing error compensating device

1976-08-09

1978-03-14

Smith, Alfred E.

Communications: radio wave antennas

Antennas

With means for moving directive antenna for scanning,...

343894, H01Q 110, H01Q 302

Patent

active

040793834

ABSTRACT:
A pointing error compensating device for compensating the error induced in a position indicator as a result of forces acting on a structure, such as gravitational forces acting on a large antenna having a reflecting dish, that is pivotal about an elevation axis.
The error compensating device comprises a torque producing device having a moment arm in the form of an eccentric mass attached to a shaft coupled to the structure, the shaft being rotatable in response to a pivotal movement of the structure. The shaft is also coupled to a drive shaft of the position indicator. The eccentric mass is attached to the transmission shaft in such a manner that it applies a torque to the latter which is proportional to the cosine of the angular orientation of the structure about the elevation axis. The transmission shaft is deflected torsionally by the eccentric mass in an amount which is designed to be approximately equal and opposite to the error which otherwise would be induced into the position indicator.

REFERENCES:
patent: 2407275 (1946-09-01), Hays, Jr.
patent: 2408825 (1946-10-01), Varian et al.
patent: 3153789 (1964-10-01), Ashton
patent: 3239839 (1966-03-01), Banche et al.
patent: 3893123 (1975-07-01), Bieser
patent: 3977248 (1976-08-01), Metzger

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