Patent ID: 6882314

Claim:
A positioning system comprising a plurality of pseudolite transmitters and a receiver system: each transmitter capable of transmitting a plurality of direct-sequence spread spectrum signals, each signal including a carrier frequency signal and a direct-sequence spreading code modulating said carrier signal at a code chipping rate; and the receiver system capable of: a) receiving a direct-sequence spread spectrum signal selected from said plurality of signals; b) determining a plurality of measurements including: a carrier phase measurement of each said carrier frequency signal; and a code phase measurement of each said spreading code; and c) calculating a range between the transmitter and the receiver system from said measurements wherein said range is determinable using a mathematical function of: a first relationship between a first integer wavelength corresponding to said first carrier phase measurement and a first statistical property of said first code phase measurement, and a second relationship between a second integer wavelength corresponding to said second carrier phase measurement and a second statistical property of said second code phase measurement.