Effects of Chip Atomic Clock on Positioning Accuracy of BDS/GPS Dual Mode Receiver

Deyou Gu, Shuai Chen, Shanwu Liu

Traditional BDS/GPS dual-mode receiver uses quartz crystal vibration as the clock source for the system to provide positioning and navigation services, but quartz crystal vibration has many defects and deficiencies in the long-term stability, the frequency drift is large, will bring certain impact on the positioning accuracy. Based on Chip level Atomic clocks (Chip Scale Atomic Clock, CSAC) instead of the traditional semiconductor, the Atomic Clock is small in size, low power consumption, can provide the frequency stability of a long period of time, its frequency deviation is less than 0.2 Hz caused even smaller, the Chip Atomic clocks, instead of the traditional quartz crystal can be greatly reduced by the local Clock frequency drift caused by doppler frequency shift, can be widely used in miniature system. Dual mode receiver position calculating of clock difference to solve out at the same time, the atomic clocks replacement semiconductor chip after vibration can make the receiver clock and satellite clock consistent as far as possible, to locate at the same time when calculating the space position dilution of precision PDOP value are also associated with satellite clock error, chip atomic clocks, can obviously improve the localization accuracy of system.