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
Denial of service (DoS) attack prevention through random access channel resource reallocation
Method for manufacturing thin film transistor and method for manufacturing display device
Method for specifying control curve parameters for controlling climatic environmental conditions of climate-controlled enclosed spaces
Combined imaging and radiation therapy
Formwork release composition and use thereof
Apparatus for transmitting and receiving data in a wireless communication system and method thereof
Touch sensing technology
  Randomly Featured Patents
Racket frame
Multilayer wiring board
Concatenation of containers in synchronous digital hierarchy network
Controlling of a vehicle responsive to reductant conditions
Progressive system and methods
Metal bellows hydraulic accumulator
Color image sensor including a plurality of photocells and a plurality of colored filters provided on the plurality of photocells
Well stimulation and formation purging composition
Front bezel for computer enclosure
Auto snack tray