Torquer current readout system for inertial instrument employing

Details Torquer current readout system for inertial instrument employing Torquer current readout system for inertial instrument employing

1980-01-16

1982-12-28

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, H03K 1302

Patent

active

043664679

ABSTRACT:
A system for converting analog torquer current to digital form is based on a current-controlled oscillator, preferably a YIG-tuned microwave oscillator, which produces an output frequency characterized by a nominally constant bias frequency term subject to drift and a tuning frequency term proportional to input current. An automatic calibration circuit gates the input current ON and OFF at a relatively low constant sampling rate. The number of cycles of the high frequency oscillator output is counted separately for the ON and OFF periods. The difference between the ON and OFF period counts is proportional to the input current and independent of the bias frequency. The system is specifically designed for converting analog torquer currents in inertial instruments to computer-compatible form.

REFERENCES:
patent: 2994825 (1961-08-01), Anderson
patent: 3014210 (1961-12-01), Beaumont
patent: 3628003 (1971-12-01), Spence
patent: 3665305 (1972-05-01), Petrohilis
patent: 3668690 (1972-06-01), Ormond
patent: 3783393 (1974-01-01), Kakiura
patent: 3833903 (1974-09-01), Gordon
patent: 3868677 (1975-02-01), Kidd
patent: 3998088 (1976-12-01), Kazangey
Taylor "IBM Technical Disclosure Bulletin" vol. 3, No. 10, Mar. 1961, pp. 128-129.
Klimovich "Pribory i Tekhnika Eksperimenta" No. 2, pp. 88-89, Mar.-Apr., 1978 (Translation by Plenum Publishing Corp. .COPYRGT.1978, pp. 361-362.

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