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A long-term broadcast ephemeris model for extended operation of GNSS satellites

机译:GNSS卫星扩展操作的长期播放星历模型

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GNSS positioning relies on orbit and clock information, which is predicted on the ground and transmitted by the individual satellites as part of their broadcast navigation message. For an increased autonomy of either the space or user segment, the capability to predict a GNSS satellite orbit over extended periods of up to two weeks is studied. A tailored force model for numerical orbit propagation is proposed that offers high accuracy but can still be used in real-time environments. Using the Galileo constellation with its high-grade hydrogen maser clocks as an example, global average signal-in-space range errors of less than 25 m RMS and 3D position errors of less than about 50 m are demonstrated after two-week predictions in 95% of all test cases over a half-year period. The autonomous orbit prediction model thus enables adequate quality for a rapid first fix or contingency navigation in case of lacking ground segment updates.
机译:GNSS定位依赖于轨道和时钟信息,这些信息在地面上预测并由各个卫星作为广播导航消息的一部分传输。 对于空间或用户段的增加,研究了预测GNSS卫星轨道的能力在长达两周的延长期间。 提出了一种用于数值轨道传播的定制力模型,其提供高精度,但仍可用于实时环境。 使用伽利略星座与其高级氢气泥浆钟作为示例,在95的两周预测后,全局平均信号空间范围误差小于25米的RMS,3D位置误差小于约50米 在半年内所有测试用例的百分比。 因此,自主轨道预测模型在缺乏地面段更新的情况下,在缺乏地面段更新的情况下实现了快速的第一修复或应急导航的质量。

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