Abstract:

Based on the time domain analysis of the continual signals which are produced by atan phase detector in the carrier phase-locked loop(PLL), Some physical laws about these signals are given. Then study the influence of the pre-detection integral time on the bandwidth of phase detector in carrier PLL, and derive a formula expressing the relationship between theoretical maximum value of the bandwidth and the pre-detection integral time. Finally, the theoretical simulation and experiment results confirm that the research conclusionis accurate.

Key words: communications technology, bandwidth, pre-detection integration, GNSS digital receiver, carrier PLL