Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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 34.degree., approximately 6 km/s is required to change the inclination to 90.degree.. 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
Removable cartridge cleaner
Methods for identifying agents that alter NAD-dependent deacetylation activity of a SIR2 protein
Method for fabricating semiconductor device with side contact
Chatting system, method and apparatus for virtual pet
Apparatus for dice table games
Occlusion-crossing devices, imaging, and atherectomy devices
Zirconium phosphate particles having improved adsorption capacity and method of synthesizing the same
  Randomly Featured Patents
Aqueous suspension of cross-linked silicone particles and aqueous emulsion of oil containing cross-linked silicone particles
Pressure vessel
Organic EL panel having partitions separating pixels
High density data storage library with horizontal array structures
Web server system
Duplex printer with internal hard drive
Circuit clustering during placement
Processes for preparing toner
Low thermal hysteresis bandgap voltage reference
Ladle or similar article