Objectives With the completion and operation of BeiDou navigation satellite system (BDS), it can provide all-time, all-weather and high-accuracy positioning, navigation and timing services to global users. Network real-time kinematic (NRTK) technology, as the primary means of high-precision positioning for BDS, has been widely used in various fields. And the demand for development and promotion of the domestic standalone BDS receivers has been increasingly growing in recent years.

Methods The data of standalone BDS receivers are process by PowerNetwork, which is a NRTK software developed independently by Wuhan University, to analyze and evaluate the NRTK performance. Sinan M300 Pro standalone BDS receiver is used to collect data at four stations in Wuhan City, and then the performance in three aspects, namely the ambiguity resolution between reference stations, generation of regional augmentation products, and real-time positioning for rover stations, are comprehensively evaluated. For ambiguity resolution, the ionospheric-free three-carrier ambiguity resolution method is used to process the three-frequency observations of BDS⁃2, while the B1I+B3I dual-frequency observations of BDS⁃2+BDS⁃3 are processed by the Melbourne–Wübbena method. For regional augmentation products, the corrections including dispersive and non-dispersive errors for the rover station are obtained by linear interpolation algorithm. In the positioning, Kalman filter is employed to determine the float ambiguity, and then the optimal position of rover station is obtained after the ambiguity is processed by least squares ambiguity decorrelation adjustment algorithm.

Results The experimental results show that the average standard deviation of the wide-lane ambiguity and the original double-difference ambiguity residuals of the three baselines is better than 0.1 cycle, which can determine the ambiguity reliably. In terms of augmentation performance, the accuracy of ionospheric delay and non-dispersive errors for all visible satellite pairs are better than 1.00 cm and 0.50 cm, respectively. For real-time positioning, the fixed rate and the correctly fixed rate of ambiguity for rover are 99.72% and 96.55%, respectively. And the root mean square values in the horizontal and elevation directions are better than 1 cm and 5 cm, respectively.

Conclusions The service performance of the domestic standalone BDS receivers in the above three aspects is not significantly different from that of multi-system GNSS receiver, and the final positioning accuracy can meet the needs of high-precision surveying and mapping.