关键词: 智能手机, 卡尔曼滤波, GNSS Analysis产品, 双频观测值

Abstract: In order to analyze the difference between single-frequency and dual-frequency smartphones in single-point positioning and dynamic navigation, this paper compares and analyzes the number of satellites, SNR, the original observation values and Kalman filtering values in static or dynamic positioning observed by single-frequency and dual-frequency smart phones. The experimental results show that under the static and unobstructed experimental conditions, compared with the original observation value of OPPO Reno single-frequency smartphone, the average positioning error of Xiaomi Mi8 dual-frequency smart phone, which can be observed by more satellites and reduced by 1.70 m. After Kalman filtering processing, the single-frequency mobile phone shows a higher accuracy improvement than the dual-frequency smart phone and the final precision of both is equivalent. Under the experimental conditions of dynamic occlusion, the average value of positioning error of dual frequency is reduced by 5.24 m compared with that of single frequency. After Kalman filtering processing, the accuracy of both has been significantly improved, and the average error of dual-frequency relative to single-frequency is reduced by 0.87 m.

Key words: smartphone, Kalman filtering, GNSS Analysis, dual frequency observation