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首页> 外文会议>Proceedings of 4th international GOCE User workshop. >GOCE SSTI L2 TRACKING LOSSES AND THEIR IMPACT ON POD PERFORMANCE
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GOCE SSTI L2 TRACKING LOSSES AND THEIR IMPACT ON POD PERFORMANCE

机译：GOCE SSTI L2跟踪损失及其对POD性能的影响

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摘要

The state-of-the-art GOCE Satellite-to-Satellite TrackingrnInstrument (SSTI) delivers high-quality GPS data with anrnalmost continuous 1 Hz data rate, which allows for veryrnPrecise Orbit Determination (POD). Despite this goodrnperformance, the GPS receiver shows occasional unexpectedrnL2 tracking losses, which mainly occur close tornthe geomagnetic poles and, to a lesser extent, also alongrnthe geomagnetic equator. The number of unexpected L2rntracking losses varies in time and shows some correlationrnwith solar activity. Less than 3% of the observation datarnis affected by these losses. Therefore, the effect on thernPOD remains limited. However, systematic effects mightrnbe present, as the quality of the GOCE orbits is slightlyrnreduced over the polar regions. The striking correlationrnbetween the global distribution of ionospheric irregularitiesrnand L2 losses suggests scintillation effects might bernpresent. Analysis of the time derivative of the geometryfreerncombination of GPS phase observations shows thatrnunexpected L2 losses occur during times of rapid ionosphericrnfluctuations. GPS satellites in cross-track directionrnare most affected by L2 losses.
机译：最新的GOCE卫星到卫星跟踪仪器（SSTI）可以提供几乎连续的1 Hz数据速率的高质量GPS数据，从而可以实现非常精确的轨道确定（POD）。尽管性能出色，但GPS接收器偶尔会出现意外的L2跟踪损耗，该损耗主要发生在地磁极附近，并且在较小程度上也发生在地磁赤道附近。意外的L2跟踪损失的数量随时间变化，并显示出与太阳活动的某些相关性。少于3％的观测数据受这些损失的影响。因此，对rnPOD的影响仍然有限。但是，由于极地地区GOCE轨道的质量略有降低，因此可能会出现系统性影响。电离层不规则性的全球分布与L2损失之间的显着相关性表明可能存在闪烁效应。对GPS相位观测值的几何自由组合的时间导数的分析表明，在电离层快速波动期间发生了意外的L2损失。跨轨道方向的GPS卫星受L2损耗的影响最大。

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