Patent ID: 7656349

Claim:
A system for enhancing position determination by a rover using a satellite ranging system to ascertain their locations, the system comprising: A. a base station including: one or more receivers for receiving and processing ranging signals from multiple earth-orbiting satellites and signals from one or more rovers and determining information relating to position, timing, or both, for the base station and the respective rovers, and a transmitter for broadcasting one or mere ranging signals based on the location of the base station, the base station ranging signals being timed in accordance with the satellite ranging system time at the location of the base station, the transmitter further transmitting information related to one or both of the locations of and the timing at the respective one or more rovers; B. the one or more rovers, each rover including one or more receivers for receiving and processing the information transmitted by the base station and the ranging signals broadcast from the satellites and the base station and determining positions, timing, or both, and a transmitter for transmitting to the base station signals that are aligned with satellite ranging system time at the location of the rover.