Abstract The radio determination satellite service (RDSS) is an advantageous and unique aspect of the BeiDou Navigation Satellite System (BDS) because other satellite navigation systems do not incorporate the RDSS. Due to the ageing of RDSS equipment, there is a long-term drift in various types of RDSS equipment time delays. There are some differences in the RDSS positioning accuracy with the change in the out-station beams, which seriously affects the positioning accuracy and service capability of the RDSS system. At present, the time delay calibration method involves sending the device to the equipment verification field to remeasure the time delay, which is cumbersome and time-consuming. The service performance and availability of the RDSS system have become greatly degraded. Therefore, a simple and efficient RDSS time delay calibration method has become an important topic for the global BeiDou system. In this study, the time delays of all channels, in-station beams, and out-station beams were obtained by the O-C method (O is the measured value and C is the theoretical value). The experiments were performed using BeiDou RDSS data in continuous 8-day tests involving five RDSS users. The results showed that the time delay accuracies of the RDSS channels, in-station beams, and out-station beams were 2.37 ns, 1.63 ns, and 2.39 ns, respectively. The positioning tests were performed based on the original and adjusted delays. The mean horizontal positioning accuracy of the five RDSS users improved from 19.71 to 4.14 m, with an average increase of 77%. The positioning accuracy achieved in this paper is much better than that of 20 m in the Beijing calibration area at present.

中文翻译：

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一种提高北斗系统RDSS服务性能的时延校准新方法

摘要 无线电测定卫星服务（RDSS）是北斗卫星导航系统（BDS）的一个优势和独特的方面，因为其他卫星导航系统不包含RDSS。由于RDSS设备老化，各类RDSS设备时延存在长期漂移。RDSS定位精度随着站外波束的变化存在一定的差异，严重影响RDSS系统的定位精度和服务能力。目前时延校准方法涉及将设备送到设备验证现场重新测量时延，繁琐耗时。RDSS系统的服务性能和可用性大幅下降。所以，一种简单高效的RDSS时延校准方法已成为全球北斗系统的重要课题。本次研究中，所有信道、站内波束和站外波束的时延均采用OC法得到（O为实测值，C为理论值）。这些实验是使用北斗 RDSS 数据在涉及五个 RDSS 用户的连续 8 天测试中进行的。结果表明，RDSS信道、站内波束和站外波束的时延精度分别为2.37 ns、1.63 ns和2.39 ns。定位测试是基于原始延迟和调整后的延迟进行的。5个RDSS用户的平均水平定位精度从19.71提高到4.14 m，平均提高了77%。