Constant sun angle transfer orbit sequence and method using electric propulsion
Patent 5716029 Issued on February 10, 1998. Estimated Expiration Date: 
October 31, 2015. 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.
October 31, 2015. 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 ReferencesSoft ride method for changing the altitude or position of a spacecraft in orbit Patent #: 4943014 InventorsAssigneeApplicationNo. 558572 filed on 10/31/1995ExaminersPrimary: Barefoot, Galen L.Attorney, Agent or FirmForeign Patent References
International ClassB64G 001/10AbstractAn apparatus and method for translating a spacecraft (102, 108) from an injection orbit (114) about a central body (100) to synchronous orbit (122) in a time efficient manner. The spacecraft (102, 108) includes propulsion thrusters (50) which are fired in predetermined timing sequences controlled by a controller (64) in relation to the apogee (118) and perigee (120) of the injection orbit (114) and successive transfer orbits (114). During transfer orbit, the spacecraft's inertial attitude is adjusted to track sun movement. The spacecraft is injected into a particular injection orbit that offsets moments created by tracking sun movement to maintain stable transfer orbits.Other References
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