Abstract: It is a major defect that the power consumption of GNSS receiver increases as parallel processing channels increases. One way of the solutions is to reduce operating frequency of the channel clock. By analyzing the relationship between the channel clock frequency and pseudo code frequency, it has been showed by this paper that the phase resolution and phase jitter of pseudo code will be affected by working clock. Selecting two working clock for simulation experiments, the results show that the pseudo-code measurement accuracy and the carrier measurement accuracy of the channel working with 21MHz clock is two times worse than that with 63MHz clock under the same simulation conditions; the error is still smaller than theoretically estimated results. Selecting a lower clock frequency is a compromise and suitable way to solve the contradiction between power consumption and measurement precision for a receiver as an engineering option.

Key words: GNSS receiver, Sampling frequency, Phase jitter, Delay locked loop