Apparatus for scanning a rotating gyroscope
First Claim
1. An improved apparatus for scanning a rotating gyroscope of the type having a rotor magnet, a cage coil disposed about said rotor magnet and a precession coil wound contiguous to and under said coil, wherein the improvement comprises:
- first operatively connected to said cage coil for phase shifting a cage coil derived signal as a function of its amplitude;
a phase-locked loop operatively connected at its input to the output of said first means and having a free running frequency approximately equal to the spin frequency of said rotor magnet so that said phase-locked loop locks-up upon the application of the phase shifted cage coil derived signal from said first means, and so that said phase-locked loop outputs a waveform that is 180°
out of phase with the phase shifted cage coil derived signal at its input; and
second means operatively connected at its input to the output of said phase-locked loop and at its output to said precession coil for driving said precession coil with a constant amplitude signal phase-locked to the phase shifted cage coil derived signal so as to drive said rotor magnet about its spin axis in a predetemined scan pattern about the missile body axis of an associated missile system.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus comprising, inter alia, gyroscope feedback circuitry which aw scanning the rotor magnet of a gyroscope disposed in an associated guided missile system so as to increase the seeker field thereof is disclosed. A signal from the cage coil of the gyroscope having an amplitude approximating a sine function of the angular position of the spin axis of the rotor magnet portion of the gyroscope with respect to the body axis of the associated guided missile is used to generate a constant amplitude drive signal for driving the precession coil of the gyroscope. Scanning, so as to drive the rotor magnet in a predetermined scan pattern is accomplished by phase shifting the signal from the cage coil as a function of its amplitude and then driving the precession coil with the aforementioned constant amplitude drive signal which is phased-locked to the phase shifted or processed cage coil signal.
36 Citations
5 Claims
-
1. An improved apparatus for scanning a rotating gyroscope of the type having a rotor magnet, a cage coil disposed about said rotor magnet and a precession coil wound contiguous to and under said coil, wherein the improvement comprises:
-
first operatively connected to said cage coil for phase shifting a cage coil derived signal as a function of its amplitude; a phase-locked loop operatively connected at its input to the output of said first means and having a free running frequency approximately equal to the spin frequency of said rotor magnet so that said phase-locked loop locks-up upon the application of the phase shifted cage coil derived signal from said first means, and so that said phase-locked loop outputs a waveform that is 180°
out of phase with the phase shifted cage coil derived signal at its input; andsecond means operatively connected at its input to the output of said phase-locked loop and at its output to said precession coil for driving said precession coil with a constant amplitude signal phase-locked to the phase shifted cage coil derived signal so as to drive said rotor magnet about its spin axis in a predetemined scan pattern about the missile body axis of an associated missile system. - View Dependent Claims (2, 3, 4, 5)
-
Specification