Patent ID: 7142159

Claim:
A pseudolite for use in a navigation system, the pseudolite comprising: a communication (COM) satellite receiver for receiving a communication satellite specific RF signal from a communication satellite and providing communication satellite navigation and position data; a GNSS receiver for receiving a GNSS signal from a GNSS satellite and providing GNSS timing information; a pseudolite transmitter for receiving said communication satellite navigation and position data and said GNSS timing information, said pseudolite transmitter, comprising: i. at least one digital signal generator for utilizing said communication satellite navigation and position data and said GNSS timing information for providing a digital signal generator output having an intermediate frequency and navigation message data which are suitable for up-conversion to a desired communication channel RF frequency; and, ii. at least one communication satellite RF module for receiving said digital signal generator intermediate frequency output from an associated signal generator and converting said intermediate frequency output to a communication satellite transmit RF signal having said desired communication channel RF frequency; wherein during operation of the pseudolite said communication satellite transmit RF signal is broadcast to a communication satellite, and then a communication satellite specific RF signal is broadcast from said communication satellite capable of being received by said communication satellite receiver, thus providing a closed loop control feedback to adjust the timing of said broadcasted communication satellite specific RF signal so that it is synchronized with said GNSS signal, said broadcasted communication satellite specific RF signal being utilizable by a user, said pseudolite thereby being capable of operating at relatively high power to overcome GNSS jamming effects with beyond the line-of-sight capability.