A method of receiving a plurality of CDMA positioning signals broadcast in a known TDMA sequence where each positioning signal is transmitted during a specified transmission time slot, each positioning signal being divided into transmission pulse periods separated by pauses where the transmission pulse periods vary in duration and frequency, the method comprising: deploying a position receiver containing means to receive and interpret said positioning signals, with at least one correlator, each correlator - providing a master timing reference for said correlator, - analysing the relationship between the reception times of the transmission pulse periods of the positioning signals and said master timing reference and subsequently determining the start and stop times of the transmission pulse periods to thereby define correlator integration intervals relative to said master timing reference, - sequentially generating PRN codes of the known TDMA sequence responsive to said determined start and stop times; the method further comprising: receiving the plurality of positioning signals at said position receiver; and communicating said determined start and stop times to said at least one correlator, the correlator generating a PRN sequence and correlating each signal with a specific PRN code, integrating between the start times and the stop times of the correlator integration intervals, a TDMA sequence determination means of said position receiver autonomously synchronising the correlation process to a TDMA reception sequence by dynamically adjusting the PRN code sequence and the start and stop times of the correlator integration intervals prior to integration to account for differences between the reception times and the nominal position receiver time slots caused by propagation delays and the varying division into transmission pulse periods of the positioning signals. deploying a position receiver containing means to receive and interpret said positioning signals, with at least one correlator, each correlator - providing a master timing reference for said correlator, - analysing the relationship between the reception times of the transmission pulse periods of the positioning signals and said master timing reference and subsequently determining the start and stop times of the transmission pulse periods to thereby define correlator integration intervals relative to said master timing reference, - sequentially generating PRN codes of the known TDMA sequence responsive to said determined start and stop times; - providing a master timing reference for said correlator, - analysing the relationship between the reception times of the transmission pulse periods of the positioning signals and said master timing reference and subsequently determining the start and stop times of the transmission pulse periods to thereby define correlator integration intervals relative to said master timing reference, - sequentially generating PRN codes of the known TDMA sequence responsive to said determined start and stop times; the method further comprising: receiving the plurality of positioning signals at said position receiver; and communicating said determined start and stop times to said at least one correlator, the correlator generating a PRN sequence and correlating each signal with a specific PRN code, integrating between the start times and the stop times of the correlator integration intervals, a TDMA sequence determination means of said position receiver autonomously synchronising the correlation process to a TDMA reception sequence by dynamically adjusting the PRN code sequence and the start and stop times of the correlator integration intervals prior to integration to account for differences between the reception times and the nominal position receiver time slots caused by propagation delays and the varying division into transmission pulse periods of the positioning signals. receiving the plurality of positioning signals at said position receiver; and communicating said determined start and stop times to said at least one correlator, the correlator generating a PRN sequence and correlating each signal with a specific PRN code, integrating between the start times and the stop times of the correlator integration intervals, a TDMA sequence determination means of said position receiver autonomously synchronising the correlation process to a TDMA reception sequence by dynamically adjusting the PRN code sequence and the start and stop times of the correlator integration intervals prior to integration to account for differences between the reception times and the nominal position receiver time slots caused by propagation delays and the varying division into transmission pulse periods of the positioning signals.