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
Single-stage PFC converter with constant voltage and constant current
Circuit and method for generating an AC voltage from a plurality of voltage sources having a temporally variable DC output voltage
Methods and apparatuses for configuring and operating graphics processing units
Electric discharge machining hole drilling
Heterocyclic compounds as CCR2B antagonists
Electrophotographic photoreceptor, image-forming apparatus, and electrophotographic cartridge
Organic EL display device and method for manufacturing the same
  Randomly Featured Patents
Chewing gum and confectionery compositions containing a stain removing complex, and methods of making and using the same
Fluid distribution across a particulate bed
Endoscopic instrument with variable viewing angle
Gamma correction device, gamma correction method thereof, and liquid crystal display device using the same
Gauge for checking sizes of mechanical parts
Ion implantation of antifoulants for reducing coke deposits
Process for the production of printed circuit boards with extremely dense wiring using a metal-clad laminate
Handheld microprocessor controlled pneumatic tappet setting system
Extended virtual memory system and method in a computer cluster
Method for application of a chip module to an antenna