Star sensor
Patent 4944587 Issued on July 31, 1990. Estimated Expiration Date: 
March 3, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 3, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3263088 Error cancelling scanning optical angle measurement system Analog apparatus for determining the attitude errors of a three-axis stabilized satellite Stellar corrector Artificial satellite attitude control system Star catalog navigation system Star sightings by satellite for image navigation Patent #: 4746976 InventorApplicationNo. 318635 filed on 03/03/1989US Classes:356/139.01, Star/Sun/Satellite position indication with photodetection250/203.6, Airborne target, or spaceborne target other than the sun (e.g., star or missile)250/206.2, Detection of positional information in two or more planes (e.g., azimuth and elevation; hour angle and declination)701/222Using star trackerExaminersPrimary: Jordan, Charles T.Assistant: Wendtland, Richard W. Attorney, Agent or FirmInternational ClassB64G 001/36Foreign Application Priority Data1988-03-17 JPAbstractA star sensor compares predetermined star information stored in a memory and actual star information corresponding to star image signals from an imaging device. A processing device generates an attitude signal corresponding to the attitude of a base with respect to the star when the predetermined and the actual star information substantially coincide. A correcting device corrects the predetermined star information when the predetermined star information and the actual star information are not substantially the same.Other References
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