Precise point positioning algorithm (PPP) in Kinematic mode provides the centimeter-level of accuracy for a surveyed point. The GNSS receiver internal oscillator does provide enough accuracy and stability to determine the high precision and accuracy for kinematic PPP results. However, because the science needs to be better. This study applies a high performance caesium frequency standard in order to better position accuracy. The collected GNSS observation data from two geodetic receivers are designed to investigate the receiver clock offsets in two modes; based on its internal oscillator and the external frequency standard. The tested scenarios contain only GPS and combined GPS and GLONASS observations. Objectives are in two folds; namely, to evaluate the characteristics of the receiver clocks comprised of accuracy, frequency stability and timing stability; and to data processing for positioning determination in kinematic PPP by applying software named PANDA, in order to determine the positioning and timing solutions. The receiver clock evaluation shows that the receiver equipped with the external caesium frequency standard provides the better results than the receiver operating on its internal clock as a time base. The positioning determination using the kinematic PPP shows the evaluation results obtained from the observation data from the receiver with or without external frequency standard do not show the significant differences in positioning accuracy at a centimeter-level of accuracy. The estimated positioning errors are weakly correlated with the estimated receiver clock error. Even though the results do not show differences significantly, this may be due to several parameters where further investigations are required.