L2C SIGNAL TRACKING DEVICE AND GPS RECEIVER USING SAME

摘要

An L2C signal tracking device for reliably tracking an L2C signal irrespective of the received state of the L2C signal. A carrier phase tracking device comprises a carrier phase error computing section (1), a carrier NCO (2), a carrier loop filter (3), a CM code generator (10a), and a CL code generator (10b). The carrier phase error computing section (1) computers the carrier phase error by the most likelihood method according to the carrier phase inputted from the carrier NCO (2), the CM code signal inputted from the CM code generator (10a), and the CL code signal inputted from the CL code generator (10b) and outputs the carrier phase error to the carrier NCO (2) through the carrier loop filter (3). The carrier NCO (2) computes the carrier phase from the carrier phase error and outputs it to the carrier phase error computing section(1).