Resources Contact Us Home
Low energy method for changing the inclinations of orbiting satellites using weak stability boundaries and a computer process for implementing same

Image Number 13 for United States Patent #6341250.

When a satellite is orbiting the earth in an elliptic orbit, it has a certain inclination with respect to the earth's equator. The usual way to change the inclination is perform a maneuver by firing the rocket engines at the periapsis of the ellipse. This then forces the satellite into the desired inclination. There is a substantially more fuel efficient way to change the inclination. This is done by an indirect route by first doing a maneuver to bring the satellite to the moon on a BCT (Ballistic Capture Transfer). At the moon, the satellite is in the so called fuzzy boundary or weak stability boundary. A negligibly small maneuver can then bring it back to the earth on a reverse BCT to the desired earth inclination. Another maneuver puts it into the new ellipse at the earth. In the case of satellites launched from Vandenberg AFB into LEO in a circular orbit of an altitude of 700 km with an inclination of, approximately 6 km/s is required to change the inclination to This yields a savings of approximately 13% in Delta-V as compared to the standard approach which could translate into a significant increase of payload or perhaps a smaller launch vehicle. This may have applications to commercial satellite launches for the Iridium or Teledesic networks and others.

  Recently Added Patents
Probe for ultrasound diagnostic apparatus
Amide derivatives, process for preparation thereof and use thereof as insecticide
Methods and apparatus for ultrasonic cleaning
Once daily formulations of tetracyclines
Deposited conductive layers for leads of implantable electric stimulation systems and methods of making and using
Biomedical electro-stimulator
Electronic device and recording medium
  Randomly Featured Patents
Image forming apparatus employing carriage with image forming unit mounted thereon
Electrical devices having adjustable capacitance
Hide transfer apparatus
Processing apparatus for a chemical reaction pack
Flash memory apparatus for controlling operation in response to generation of interrupt signal and method of controlling the same
Reactor control having transient mitigation system
Dial up telephone conferencing system controlled by an online computer network
Nanogaps: methods and devices containing same
Printed circuit board and method for attaching movable switch thereto