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
Endotracheal tube
System or method to assist and automate an information security classification and marking process for government and non-government organizations for information of an electronic document
Push button
Driver circuit for driving semiconductor switches
Headphone
Storage system comprising multiple microprocessors and method for sharing processing in this storage system
Segmentation of a product markup image based on color and color differences
  Randomly Featured Patents
Method for delivering functional domains of diphtheria toxin to a cellular target
Drop in refrigerant blend for mineral oil based systems
Method and composition for chloroaluminate molten salts having a wide electrochemical window
Bracelet for attaching tool bits
Manufacture of zinc hexasulfide amine complexes
Organic siloxane copolymer film, method and deposition apparatus for producing same, and semiconductor device using such copolymer film
Micro-lens arrays for display intensity enhancement
AMPA-binding human GluR4 receptors
One-piece pad holder for a floor buffing machine
Apparatus for winding tape on cores