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Precise orbit and clock determination for BeiDou-3 experimental satellites with yaw attitude analysis

机译：具有偏航态度分析的北欧3实验卫星的精确轨道和时钟测定

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AbstractFive new-generation BeiDou-3 experimental satellites, called BeiDou-3e, have been launched into inclined geosynchronous orbit (IGSO) and medium orbit (MEO) since March 2015. In addition to newly designed signals and intersatellite links, different satellite buses, updated rubidium atomic frequency standards (RAFSs), and new passive hydrogen masers (PHMs) have been used. Using 15 stations, mainly in the Asia–Pacific region, we determined orbits and clock for both the BeiDou-3e and the regional BeiDou-2 satellites using the Extend CODE (Center for Orbit Determination in Europe) Orbit Model (ECOM). The orbit consistency, indicated by 3D orbit boundary discontinuity, is 50–70 and 40–60?cm for BeiDou-3e IGSO and MEO satellites, respectively, and better than 15?cm in radial component. Satellite laser ranging (SLR) validation gives about 17 and 10?cm for BeiDou-3e IGSO and MEO satellites. The BeiDou-3e satellites orbits show slightly better performance than the BeiDou-2 satellites as indicated by SLR. However, errors depending on the sun elongation angle were identified in SLR residuals for the BeiDou-3e IGSO C32 satellite, while such errors did not exist for BeiDou-2 IGSO/MEO and BeiDou-3e MEO satellites. No orbit accuracy degeneration for BeiDou-3e IGSO and MEO satellites was observed when the elevation angle (βangle) of the sun above the orbital plane was between ??4° and +?4°. In that case, the BeiDou-2 IGSO and MEO satellites are in orbit normal (ON) mode. An analysis of the yaw attitude identified that BeiDou-3e satellites did not use the ON mode, but experienced midnight- and noon-point maneuvers when theβangle is approximately between ??3° and +?3°. Compared with BeiDou-2 satellites, the onboard clocks of the BeiDou-3e IGSO satellites showed dramatic improved performance. The stability of BeiDou-3e IGSO satellites can be compared to the
机译：<！[cdata [<标题>抽象 ara id =“par6”>五个新一代北斗-3实验卫星，名为beidou-3e，已推出到倾斜的地球同步轨道（Igso）和中轨（ Meo）自2015年3月以来。除了新设计的信号和梭司机链路外，还使用不同的卫星公共汽车，更新的铷原子频率标准（RAFS）和新的无源氢气剂（PHMS）。使用15个站点，主要在亚太地区，我们使用延伸代码（欧洲轨道轨道轨迹中心）北欧-3E和地区北欧-2卫星的轨道和时钟确定了轨道和时钟。由3D轨道边界不连续表示的轨道一致性，分别为50-70和40-60Ω厘米，分别为径向部件中的15μm卫星。卫星激光测距（SLR）验证为Beidou-3e Igso和Meo卫星提供约17和10厘米。北欧-3E卫星轨道显示比SLR所示的Beidou-2卫星略微更好。然而，根据北欧-3E IGO C32卫星的SLR残留物中鉴定了根据太阳伸长角的误差，而Beidou-2 Igso / Meo和北欧-3E Meo卫星则不存在这些误差。当轨道平面上方的升降角度（<重点型=“斜体”>β角度在轨道平面上方在4°和+上方时，没有轨道精度退化和Meo卫星的轨道准确度。 4°。在这种情况下，北欧-2 Igso和Meo卫星在轨道正常（开启）模式。偏航态度的分析确定了北欧-3E卫星没有使用开启模式，但是当<重点型=“斜体”>β角度大致之间时，午夜和中午何时的动作在3 °和+？3°。与北欧2卫星相比，北欧-3E IGSO卫星的板载时钟显示出显着提高的性能。北欧-3E IGSO卫星的稳定性可以与

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