Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Cooking device and method of manufacture of the same
Bundled flexible cable with water resistant structure
Reconstruction of deforming surfaces by canceling ambient occlusion and refining 3-D shape
UV exposure method for reducing residue in de-taping process
Myoglobin blooming agents, films, packages and methods for packaging
Control device
Electrostatic charger and image forming apparatus
  Randomly Featured Patents
Cable machine control
Optical fiber for single-mode operation
Bumper for vehicle
Fermentation process for the preparation of ergot alkaloids, primarily ergocornine and .beta.-ergocryptine
Adaptive twist system for a rotor blade
Branched sensor system
Process for purifying methacrylate
System and method for odorizing natural gas
Aqueous coating compositions for antistat layers having print retaining qualities
Tilting angle adjusting device for use in a projector