Alignment error calibrator and compensator

Details Alignment error calibrator and compensator Alignment error calibrator and compensator

1982-02-04

1984-12-11

Smith, Jerry

Boots, shoes, and leggings

364516, 73 1E, 358125, G01C 2500, G01C 2118

Patent

active

044882491

ABSTRACT:
In an airborne target acquisition and tracking system having a stabilization axis and an optical axis in which a slight mechanical misalignment is present, an apparatus and method for electronically compensating for such misalignment. A roll rate sensing circuit in the system produces a signal when the aircraft rolls. A yaw scaling factor circuit and a pitch scaling factor circuit operate on the roll rate signal and apply scaled versions thereof to the yaw rate servo subsystem and the pitch rate servo subsystem respectively to cancel a yaw rate error signal and a pitch rate error signal produced by the mechanical misalignment. The required scale factors are automatically adjusted by use of a calibrate mode by microprocessors that calculate the ratio of yaw and pitch error signals, generated by artifically rolling the system, to the roll rate signal also generated. The measured ratios are stored in non-volatile memories functioning when the system is in the operate mode. Alternatively, the system control computer may be programmed to provide the above noted calibration and compensation functions.

REFERENCES:
patent: 3430238 (1969-02-01), Buell et al.
patent: 3442140 (1969-05-01), Pelteson
patent: 3518372 (1970-06-01), Johns
patent: 3576124 (1971-04-01), O'Connor
patent: 3633003 (1972-01-01), Talwani
patent: 3731521 (1973-05-01), Solov et al.
patent: 3782167 (1974-01-01), Stuelpnagel
patent: 3829659 (1974-08-01), Margolis
Gibb and Lane, "A Line of Sight Stabilisation System", Mar. 1981, vol. 1, No. 1, Journal of Electrical and Electronics Engineering, Australia.

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