Abstract
L2C is the first modernised GPS signal for civilians, broadcast by the new
generation of satellites, designated Block IIR-M. Currently three of these
satellites (PRN-17, PRN-31 and PRN-12) have been declared operational by
the Air Force Space Command at Schriever Air Force Base, Colorado. The
structure of the L2C signal is designed such that it achieves a number of
advantages over the GPS L1 signal alone. This includes weak signal
acquisition, ionospheric error elimination when both L1 and L2C are used,
quicker operations and improved tracking performance. It was suggested that
it would be interesting as well as challenging to acquire and track the L2C
signal with a standard GPS L1 receiver. "Namuru" is an FPGA-based GPS
L1 receiver, developed at School of Surveying & Spatial Information
Systems, UNSW.