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Investigation of ionospheric gradients for GAGAN application

机译:GAGAN应用的电离层梯度研究

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To cater to the needs of aviation applications, GPS Aided GEO Augmented Navigation (GAGAN) system is being implemented over the Indian region. The most prominent parameter affecting the navigation accuracy of GAGAN is ionospheric delay which is a function of TEC. In the equatorial and low latitude regions such as India, TEC is often quite high with large spatial gradients. Carrier phase data from the GAGAN network of Indian TEC Stations is used for estimating ionospheric gradients in multiple viewing directions. Rate of TEC (ROT) and Rate of TEC Index (ROTI) are calculated to identify the ionospheric gradients. Among the satellite signals arriving in multiple directions, the signals which suffer from severe ionospheric gradients are identified and avoided for improving GAGAN positional accuracy. The outcome of this paper will be helpful for improving GAGAN system performance.
机译:为了满足航空应用的需求,正在印度地区实施GPS辅助GEO增强导航(GAGAN)系统。影响GAGAN导航精度的最突出参数是电离层延迟,它是TEC的函数。在赤道和低纬度地区,例如印度,TEC往往很高,并且具有较大的空间梯度。来自印度TEC站GAGAN网络的载波相位数据用于估计多个观察方向上的电离层梯度。计算TEC速率(ROT)和TEC指数速率(ROTI)以识别电离层梯度。在沿多个方向到达的卫星信号中,识别并避免了遭受严重电离层梯度影响的信号,以提高GAGAN的定位精度。本文的结果将有助于提高GAGAN系统的性能。

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