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
Duty cycle adjustment of remote illumination source to maintain illumination output
Flexible pouch
Method for treating wounds for mammals, wound healer compound, and method of manufacturing thereof
Triazole derivatives as ghrelin analogue ligands of growth hormone secretagogue receptors
Context-based adaptive binary arithmetic coding engine
Fusion of road geometry model information gathered from disparate sources
Method and device for managing a turning setpoint applied to at least one turning actuator for the rear wheels of an automobile
  Randomly Featured Patents
Gearshift indicator with range adjustment
Spot-welded end fitting for flexible metal piping
Multi-bioreactor hollow fiber cell propagation system and method
Pet carrier
Fluorescent lamp
Virtual memory allocation in a virtual address space having an inaccessible gap
Knife sharpening method and system
Brake regulator with double valve
Handle with a power-regulating device
High speed redundant data processing system