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Characteristics of Electron Content Between GPS and IRNSS Altitudes Studied Around the Northern Anomaly Crest Location Over Indian Longitude Sector
Radio Science ( IF 1.6 ) Pub Date : 2020-08-13 , DOI: 10.1029/2019rs007041
K. S. Paul 1 , A. Paul 1
Affiliation  

One of the newly launched satellite navigation systems is the Indian Regional Navigation Satellite System (IRNSS) operating at L5 and S band and providing position determining with an accuracy of 10 m over the Indian subcontinent and 1,500 km beyond. Collocation of this constellation, containing three geostationary and four geosynchronous satellites, with GPS over a common ionospheric volume at certain times of the day provides a unique opportunity to estimate the highly sparse electron content existing between the GPS and geostationary/synchronous orbital altitudes. These values of electron contents, though an order of magnitude less than the diurnal maximum of TEC, could account for significant proportion of postmidnight TEC around the northern crest of Equatorial Ionization Anomaly in the Indian longitude sector. Such measurements are of importance when efforts are being made to achieve subcentimeter level position accuracies. Data recorded using a tri‐band IRNSS receiver and dual‐frequency GPS receiver from Calcutta during April–June 2019 have been analyzed to calculate electron contents along a specific look angle containing GPS as well as IRNSS satellite at different times of the day. Diurnal maximum values of 4–5 TECU are noted for electron contents bound within the altitudes of GPS and IRNSS. Spatial distribution of such electron content shows diurnal maximum around 14:00–15:00 LT over subionospheric swath of 20–22°N with 80–82.5°E and 87–90°E.

中文翻译:

在印度经度区北部异常波峰位置周围研究的GPS和IRNSS海拔之间的电子含量特征

新推出的卫星导航系统之一是在L5和S波段运行的印度区域导航卫星系统(IRNSS),其位置确定精度在印度次大陆上为10 m,在其后为1,500 km。这个星座的搭配,包括三颗对地静止卫星和四颗对地同步卫星,并在一天中的特定时间在相同的电离层体积上进行GPS定位,这为估算存在于GPS和对地静止/同步轨道高度之间的稀疏电子含量提供了独特的机会。这些电子含量值虽然比TEC的日最大值小一个数量级,但可以解释印度经度区赤道电离异常北部波峰附近午夜TEC的很大比例。当努力实现亚厘米级的位置精度时,此类测量非常重要。分析了使用加尔各答(Calcutta)在2019年4月至6月期间使用三频IRNSS接收器和双频GPS接收器记录的数据,以计算一天中不同时间沿特定视角的电子含量,其中包含GPS和IRNSS卫星。对于绑定在GPS和IRNSS高度内的电子含量,记录了4-5 TECU的日最大值。此类电子含量的空间分布显示,在20–22°N和80–82.5°E和87–90°E的亚电离层带中,LT在14:00–15:00左右的日最大最大值。分析了使用加尔各答(Calcutta)在2019年4月至6月期间使用三频IRNSS接收器和双频GPS接收器记录的数据,以计算一天中不同时间沿特定视角的电子含量,其中包含GPS和IRNSS卫星。记录在GPS和IRNSS高度范围内的电子含量的日最大值为4–5 TECU。此类电子含量的空间分布显示,在20–22°N和80–82.5°E和87–90°E的亚电离层带中,LT在14:00–15:00左右的日最大最大值。分析了使用加尔各答(Calcutta)在2019年4月至6月期间使用三频IRNSS接收器和双频GPS接收器记录的数据,以计算一天中不同时间沿特定视角的电子含量,其中包含GPS和IRNSS卫星。对于绑定在GPS和IRNSS高度内的电子含量,记录了4-5 TECU的日最大值。此类电子含量的空间分布显示,在20–22°N和80–82.5°E和87–90°E的亚电离层带中,LT在14:00–15:00左右的日最大最大值。
更新日期:2020-08-13
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