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
LED package chip classification system
Mobile communication method, mobile station, and network device
Circuits for prevention of reverse leakage in V.sub.th-cancellation charge pumps
Face recognition through face building from two or more partial face images from the same face
System and method for deriving cell global identity information
Data center with free-space optical communications
Devices including composite thermal capacitors
  Randomly Featured Patents
Distributed ISP load balancer
New Guinea Impatiens plant named `Kisaul`
Blind slats
Information handling system manufacture method and system
Armature core of start motor
Metallization of non-conductive surfaces with silver catalyst and electroless metal compositions
Signal selecting circuit which selectively outputs predetermined signal to host computer compatible with plurality of computer hardware types and disk drive having such signal selecting circui
Plane type strip-line filter in which strip line is shortened and dual mode resonator in which two types microwaves are independently resonated
Fuel cell assembly method with selective catalyst loading
Pair of headphones