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
Pharmaceutical powder compositions
Mobile advertising and compensation-verification system
Cryptographic key split combiner
Reduced plating ignitron
Algorithm for color corrected analog dimming in multi-color LED system
Nonvolatile semiconductor storage device having conductive and insulative charge storage films
  Randomly Featured Patents
Waffle machine
High speed level shift circuit for low voltage output
Biodegradable composition for the preparation of tableware, drink container, mulching film and package and method for preparing the same
Fuel injection system with pressure boosting
Inflatable dock seal
Method for manufacturing a decorative food
Simple high resolution monolithic DAC for the tuning of an external VCXO (voltage controlled quartz oscillator)
Circulating water sound box
Communication relay system, server, and method for same
Ceiling fan blade iron