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
Cellulose ester compositions having low birefringence and films made therefrom
Sweetener compositions having enhanced sweetness and improved temporal and/or flavor profiles
Method and apparatus for increasing query traffic to a web site
Question and answer system wherein experts are associated with models and have response rates that are associated with time intervals
Light transformation particle and photobioreactor
Catalyst composition with nanometer crystallites for slurry hydrocracking
Field-programmable analog array with memristors
  Randomly Featured Patents
Metal element for fastening a rail to a concrete tie
Process for synthesis of proton pump inhibitors
Methods and devices for producing biomolecules
Bicycle speedometer
Systems, methods, and compositions for production of synthetic hydrocarbon compounds
Methods for embedding image, audio and video watermarks in digital data
Cable fixing structure on flat panel
N-acylpyrrolidin-2-ylalkylbenzamidine derivatives as inhibitors of factor Xa
Power floating production and ship propulsion supported by gyroscope and energized by seas
Device for the investigation of highly resolved partial spectra of an echelle spectrum