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
Profile and template based dynamic portable user workflow
Additives for oil recovery from reservoirs
Cooling structure for electronic device
Tactile output device for computing device notifications
Methods and system for displaying segmented images
Automated synchronization of design features in disparate code components using type differencing
Methods and apparatus to provide haptic feedback
  Randomly Featured Patents
Single-lens reflex camera body
Apparatus for transporting substantially parallelepipedic packets
Conversion of side by side FCC unit
Three-dimensional novelty necklace
Support method for simulating a printing operation
Track design
Toy animal
Laterally movable wheel rim
Apparatus, and system for triggering oxygen scavenging films
Electric double layer capacitor and method for manufacturing same