Gyroscope north seeker system and method

Details Gyroscope north seeker system and method Gyroscope north seeker system and method

2007-08-03

2008-08-19

Guadalupe-Mccall, Yaritza (Department: 2841)

Geometrical instruments

Indicator of direction of force traversing natural media

Gyroscopically controlled or stabilized

C033S316000, C033S318000

Reexamination Certificate

active

07412775

ABSTRACT:
A sensor system and method for determining a relative direction to true north is provided. The system comprises at least one angular rate sensor, such as a MEMS sensor, which has an input axis and a rotation axis. The sensor comprises a motor drive structure, a motor signal output from the motor drive structure, a gyroscope, and a sensor rate output from the gyroscope for a sensor rate signal. A frequency divider is in operative communication with the motor signal output, and a spinning device is coupled to the angular rate sensor. A spinning device motor is coupled to the spinning device and is in operative communication with the frequency divider. The spinning device motor has an axis of rotation that is substantially perpendicular to the input axis of the sensor. The spinning device motor is configured to be driven by a periodic signal from the sensor. A position of the spinning device is synchronized to the periodic signal to generate a spinning device position signal. A phase detector is in operative communication with the spinning device motor and with the sensor rate output. The relative direction to true north is determined from a phase differential between the spinning device position signal and the sensor rate signal.

REFERENCES:
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patent: 7213343 (2007-05-01), Glantz et al.
patent: 2007/0106457 (2007-05-01), Rosenberg

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