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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Characteristics of second-order residual ionospheric error in GNSS radio occultation and its impact on inversion of neutral atmospheric parameters
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Characteristics of second-order residual ionospheric error in GNSS radio occultation and its impact on inversion of neutral atmospheric parameters

机译：GNSS掩星的二阶残留电离层误差特征及其对中性大气参数反演的影响

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摘要

In Global Navigation Satellite Systems (GNSS) radio occultation (RO), one of the most significant error sources is the ionospheric error, which is largely eliminated by dual-frequency linear combination. However, second-order residual ionospheric error (RIE) in excess phase still remains and affects the retrievals of neutral atmospheric parameters in RO. Second-order RIE varies with RO azimuth in a sinusoidal pattern for a set of simulated RO events occurring in the same location at different azimuths. The amplitude of the sinusoidal curve below 60 km is at the order of sub-centimeter under moderate solar activity level. The retrieval biases of the neutral atmospheric parameters induced by second-order RIE also have sinusoidal features with RO azimuth, but have opposite variation trends to that of the second-order RIE. The RO azimuths of the maximum positive and negative retrieval biases correspond approximately to the azimuths of maximum negative and positive second-order RIEs, respectively. The order of the maximum bending angle bias induced by the second-order RIE is about 10(-8) rad under moderate solar activity level. However, the retrieval errors at low latitude are larger than those at high and middle latitudes, and the maximum temperature bias at low latitude could be 0.35 K at 40 km. Based on the sinusoidal variation of second-order RIE, it is shown that even at the same RO point and under the same solar activity level, the second-order RIEs at different RO azimuths still have different effects on the retrieval precision of atmospheric parameters. This should be considered carefully when many RO profiles are averaged for climate trend detection, especially at low latitude. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在全球导航卫星系统（GNSS）的无线电掩星（RO）中，最重要的误差源之一是电离层误差，双频线性组合在很大程度上消除了这种误差。但是，剩余相中的二阶残留电离层误差（RIE）仍然存在，并且会影响RO中中性大气参数的获取。对于在相同位置，不同方位发生的一组模拟RO事件，二阶RIE随RO方位以正弦波模式变化。在中等太阳活动水平下，低于60 km的正弦曲线的振幅约为亚厘米。二阶RIE引起的中性大气参数反演偏差也具有RO方位角的正弦特征，但与二阶RIE具有相反的变化趋势。最大正和负恢复偏压的RO方位角分别近似对应于最大负和正二阶RIE的方位角。在中等太阳活动水平下，二阶RIE引起的最大弯曲角偏置的阶数约为10（-8）rad。然而，低纬度的反演误差大于中高纬度的反演误差，在40 km处，低纬度的最大温度偏差可能为0.35K。基于二阶RIE的正弦变化，表明即使在相同的RO点和相同的太阳活动水平下，不同RO方位角的二阶RIE对大气参数反演精度的影响也不同。当平均许多反渗透剖面用于气候趋势检测时，尤其是在低纬度地区，应仔细考虑这一点。 （C）2015 Elsevier Ltd.保留所有权利。

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