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
Method and system for automatic 3-D image creation
Packaging for socks
Method and system for shared high speed cache in SAS switches
Semiconductor unit having a power semiconductor and semiconductor apparatus using the same
Method and system for generating and displaying an interactive dynamic selective view of multiply connected objects
Data center with free-space optical communications
Depth estimation apparatus and method
  Randomly Featured Patents
System and method of charging for user traffic except signaling a wireless communication system
Air circulating apparatus
Water sporting equipment
Sealing device for coke oven doors
Method of determining the minimum number of securing points required on an electronic isolation shield to sufficiently secure the shield to a circuit board
Developing device with development electrode cleaning unit
Method for classifying errors in the layout of a semiconductor circuit
Device for remotely changing the set temperature of a thermostat
Upstream channel multicast media access control (MAC) address method for data-over-cable systems
Commercial ice making apparatus and method