Abstract: The data transition tracking loop (DTTL) can not obtain good performance pseudonoise(PN) timing recovery under the condition of small symbol signaltonoise ratio (SNR).To overcome this shortcoming, a novel chip tracking loop (CTL) was adopted. The mean square timing jitter performance of the CTL and the DTTL for MSK waveform PN code was analyzed in a wide range of symbol SNR. The simulation results show that the same performance can be obtained by the DTTL and the CTL at large symbol SNR environment, while in small symbol SNR environment the performance of the CTL is better than that of the DTTL.

Key words: information processing, chip tracking loop, data transition tracking loop, MSK waveform, PN code ranging