Resources Contact Us Home
Methods and apparatus for a navigation system with reduced susceptibility to interference and jamming

Image Number 3 for United States Patent #7372400.

A navigation system provides a significant level of protection against all forms of interference or jamming to GPS in a cost-effective way. The system employs a network of ground reference stations and Low Earth Orbiting (LEO) satellites in conjunction with GPS. A common-view ranging geometry to a GPS satellite is established that links a reference station and a user. A second common-view geometry to a LEO satellite between the same reference station and user pair is also established. The ground stations synthesize real-time aiding signals by making carrier phase measurements of GPS the LEO satellite signals. This aiding information is transmitted via the LEO satellites to the user receiver at high power to penetrate ambient jamming. The user receiver locks onto the carrier phase of the LEO satellite, demodulates the aiding information, then applies the carrier phase measurements and the aiding information to enable extended coherent measurements of the GPS signals. The system thereby recovers the GPS signals that would otherwise be lost to the jamming.

  Recently Added Patents
Apparatus and method of preventing signal delay in display device
Liquid crystal display device
Alternate source programming
Coupling device having piercing member
Color image display device, color filter substrate, color pixel array substrate, and electronic device
Methods, devices and software applications for facilitating a development of a computer program
Substituted indolo 4,3 FG quinolines useful for treating migraine
  Randomly Featured Patents
Jet scrubber and method of operation
Laminate sheet
Pneumatic speed control for an electric sewing machine
Control unit and method of making the same
Method for distinguishing between complex character sets
Sheet package producing system, sheet handling device, and fillet folding device
Flexible wiring board mounting structure of an image shake correcting apparatus
Endoscope reprocessing and sterilization system
Surface mounting type planar magnetic device and production method thereof
Back brace