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
Hydrogenolysis of ethyl acetate in alcohol separation processes
Dynamically reconfigurable systolic array accelorators
Baseball themed hand clap maraca
Error recovery storage along a memory string
Electrophoretic element and display device
Illumination apparatus for microlithography projection system including polarization-modulating optical element
Field of view matching in a visual prosthesis
  Randomly Featured Patents
Control system for jack for a snow plow
Adjunct to a speed spanner
Multiple parameter doppler radar
Gm-C filter tuning circuit based on relaxation oscillator
Manufacturing method of semiconductor device
Gas laser
Cross-sectional stabilizers for elastomeric concrete form liners
Portable cement mixer
Accurate location sonar and radar
Self-latching restraint for an actuator of a disk drive