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
Question and answer system wherein experts are associated with models and have response rates that are associated with time intervals
Methods for predicting cardiac toxicity
Method and apparatus for exercise monitoring combining exercise monitoring and visual data with wireless internet connectivity
Method of preparing MgB.sub.2 superconducting wire and the MgB.sub.2 superconducting wire prepared thereby
High density vertical structure nitride flash memory
Providing multiple decode options for a system-on-chip (SoC) fabric
Modular system having expandable form factor
  Randomly Featured Patents
Aggregate signature schemes
Method of operating an electron beam measuring device
Servo track writing for ultra-high TPI disk drive in low density medium condition
Automated sample treatment system: apparatus and method
Automatic tethering system for a floating dock
Pocketed pillow
Locking-mechanism for preventing premature opening of a tool
Anti-static bar
Pressurized toy water gun with selective pressurization
Semiconductor memory device and method of manufacturing the same