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A New Ionospheric Correction Method for Precise Positioning with GPS active Network

机译：一种新的GPS主动网络精确定位的新电离层校正方法

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Over the past few years, the use of a network of multiple GPS reference stations for generating carrier phase based corrections has emerged to achieve highly precise real-time kinematic positioning (RTK) over long distances. The ionospheric delay error is the major error source which degrades the positioning accuracy in network RTK. Different approaches have been proposed to estimate GPS errors based on GPS reference network, such as virtual reference stations (VRS) and network corrections. This paper proposes a new method to model the ionospheric total electronic content (TEC) distribution in space. Unlike most ionospheric models, we only model the ionospheric delays along the tracks of satellites. Therefore, our model is capable of providing better precision and high resolution on ionospheric TEC distribution in both spatial and temporal scales. The experimental tests demonstrate that the new ionospheric correction method can be used to describe the ionospheric variation at low latitude area where ionospheric activities are strong. Also, the accuracy of the ionospheric model is accurate enough to support centimeter-level positioning within the network. As the ionospheric models are satellite-based models (each satellite has one model), the model parameters can be easily incorporated with the existing DGPS RTCM 104 format.
机译：在过去的几年中，已经出现了使用用于产生载波相位校正的多个GPS参考站网络以在长距离上实现高度精确的实时运动定位（RTK）。电离层延迟误差是主要误差源，其降低了网络RTK中的定位精度。已经提出了基于GPS参考网络的GPS误差，例如虚拟参考站（VRS）和网络校正来估计不同的方法。本文提出了一种模拟空间中电离层总电子含量（TEC）分布的新方法。与大多数电离层模型不同，我们只沿卫星轨道模拟电离层延误。因此，我们的模型能够在空间和时间尺度的电离层TEC分布上提供更好的精度和高分辨率。实验试验表明，新的电离层校正方法可用于描述电离层活动强度的低纬度区域的电离层变化。此外，电离层模型的精度足以满足网络内的厘米级定位。由于电离层模型是基于卫星的型号（每个卫星具有一个型号），因此可以轻松地与现有的DGPS RTCM 104格式融入模型参数。

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