POSITIONING SYSTEM

摘要

A positioning system (1) comprising one or more transmitters configured to transmit transmissions including positioning data, wherein the system is configured to synchronise the transmission with a reference time. The transmissions are formed using a repeating pseudorandom number (PRN) code comprising a plurality of chips. The system (1) is configured to determine a timing bias (44;54) between the first transmission and the reference time. The system (1) is configured to change the number of chips in one or more of said transmissions such that the timing bias of a subsequent pseudorandom number (PRN) code is reduced.