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
Encoder that optically detects positional information of a moving body from different optical paths lengths
Remedy for overactive bladder comprising acetic acid anilide derivative as the active ingredient
Matching geometry generation and display of mammograms and tomosynthesis images
Device and method for generating soft tissue contrast images
Method and system for billing based on color component histograms
Protective vest
Navigation apparatus, search result display method, and graphical user interface
  Randomly Featured Patents
Velocity calculating device, velocity calculation method, and navigation device
Tool container
Folding attachment for shirt backs
Arrangement for cooling a flow-passage wall surrrounding a flow passage, having at least one rib element
Subsurface irrigation apparatus and method
Online image customization and printing on merchandise
Method for communicating between nodes and server apparatus
Hybrid WDM-TDM optical communication and data link
High volume permanent magnet filter for removing ferromagnetic impurities