无线电工程

为验证GNSS兼容频点定位性能，给出了顾及系统间偏差的PPP模型，推导了各GNSS兼容频点卫星UCD改正模型。基于全球范围内的MGEX测站，从5个方面开展了7种定位模式下，动态PPP性能分析。结果表明：(1) BDS-3兼容频点在3个单系统测试中最优，定位率、PDOP及可用卫星数分别为97.61%、1.94和9,Galileo次之，GPS最差；(2) BDS-3与其他系统的联合模式要优于其它系统间的联合，并且在GNSS联合定位中，BDS-3贡献最大；(3) BDS-3/Galileo联合模式收敛时间最快和收敛精度最高，E、N、U各方向收敛时间分别为22.70、7.99、11.17 min,收敛精度分别为1.6、1.2、4.9 cm;(4) BDS-3与其他系统联合均可显著加快收敛时间和提高收敛精度。可明显看出，BDS-3在GNSS兼容互操作发展方向扮演着重要的角色。

In order to verify the positioning performance of GNSS compatible frequency, a PPP model considering the inter system bias was proposed, and a UCD correction model was derived for each GNSS compatible frequency of all satellites. Based on MGEX stations worldwide, the dynamic PPP performance under seven positioning modes is compared and analyzed from five aspects. The results show that,(1) BDS-3 is the best compatible frequency among the three single systems, and the positioning rate, PDOP and number of available satellites are 97.61%, 1.94 and 9, respectively, followed by Galileo and GPS;(2) The combined mode of BDS-3 and other systems is better than other combined systems, and in GNSS joint positioning, BDS-3 contributes the most;(3) The convergence time of BDS-3/Galileo combined mode is the fastest and the convergence accuracy is the highest. The convergence time of E, N and U directions is 22.70, 7.99 and 11.17 min, and the convergence accuracy is 1.6, 1.2 and 4.9 cm, respectively.(4) The combination of BDS-3 and other systems can significantly accelerate the convergence time and improve the convergence accuracy. Therefore, it is clear that BDS-3 plays an important role in the development of GNSS compatibility and interoperability.