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 of operating an election ballot printing system
Multiplanar image displays and media formatted to provide 3D imagery without 3D glasses
Methods and apparatus for dynamic identification (ID) assignment in wireless networks
Secure device sharing
Methods of operating non-volatile memory devices during write operation interruption, non-volatile memory devices, memories and electronic systems operating the same
RPM Controlled Wind Power Generation System
Method and arrangement for controlling semiconductor component
  Randomly Featured Patents
Fuel injection apparatus
Broach display case
Method for forming low and high minority carrier lifetime layers in a single semiconductor structure
Multi-functional knock-down type make-up kit
Ceramic lamp having electrodes supported by crimped tubular inlead
Magnetically navigated pacing leads, and methods for delivering medical devices
Electronic control of the pressure and flow of linear pumps and compressors
Support platform and structure for fish farming ("artificial island reef platform")
Aerogel materials and detectors, liquid and gas absorbing objects, and optical devices comprising same
Power drive system