Satellite Navigation and Sources of Errors in Positioning: A Review

Bhardwaj, Sharat Chandra; Shekhar, Sushant; Vidyarthi, Anurag; Prakash, Rishi

doi:10.1109/icaccm50413.2020.9212941

Cited by 16 publications

(3 citation statements)

References 9 publications

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“…Due to technological advances, even handheld devices (mobile phones) can perform location-based services. Bhardwaj et al [26] provided a brief review of satellite navigation, such as the working principle, position determination method, type of reference system for navigation applications, and satellite measurement technology. Kur et al [27] studied the intersatellite link (ISL) to improve the accuracy of orbit determination and satellite clock estimation.…”

Section: State Of the Artmentioning

confidence: 99%

Transmission Control of Cross‐Regional Heterogeneous Networks for Direct Position Determination

Zong

Wang

et al. 2021

Wireless Communications and Mobile Computing

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In direct position determination (DPD), a large number of observation data need to be integrated and transmitted, which creates higher requirements for the transmission performance of the network. To alleviate the problem of performance degradation in a large number of data transmissions, this paper proposes a heterogeneous network architecture and transmission control algorithm for cross-regional heterogeneous networks. Through the heterogeneous integration of satellite and multihop networks, a transmission control model suitable for the long delay and high bit error rate environments is established, the congestion window of each stage of network transmission is analyzed, and the efficiency and accuracy of the algorithm are verified by experiments. The results show that a large amount of data can be transmitted in a heterogeneous network. When dealing with direct location, the algorithm can effectively transmit a large number of observation data for cross-regional heterogeneous networks. This simple and applicable transmission control algorithm can improve the satellite link throughput and reduce the download response time compared with the traditional transmission algorithm. These studies provide a reference for a large number of data transmissions in direct position determination.

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Section: State Of the Artmentioning

confidence: 99%

Transmission Control of Cross‐Regional Heterogeneous Networks for Direct Position Determination

Zong

Wang

et al. 2021

Wireless Communications and Mobile Computing

View full text Add to dashboard Cite

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Section: Introductionmentioning

confidence: 99%

Evaluation of Seasonal Variability of First-Order Ionospheric Delay Correction at L5 and S1 Frequencies Using Dual-Frequency NavIC System

Bhardwaj

Vidyarthi²,

Jassal³

et al. 2022

Wireless Pers Commun

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“…There are many factors such as troposphere, earth magnetic field, multipath signal, etc. which causes degradation in positional accuracy [2] but the major positioning error is introduced by Ionosphere [3]. In the earth's atmosphere from 60 to 1000 km, a layer of ionized electrons and ions are present.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Seasonal Variability of First-order Ionospheric Delay Correction at L5 and S1 Frequencies Using Dual-frequency Navic System

Bhardwaj

Vidyarthi

et al. 2021

Preprint

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For the precise positioning application it is important to determine and eliminate the positioning error introduced by various sources such as the ionosphere. To develop a standalone precise navigation system, India has launched the seven satellite constellations of NavIC (Navigation with Indian Constellation) system to provide precision positioning over India and surrounded landmass. Since the ionospheric delay depends on the frequency of the satellite signal and NavIC systems work at different frequencies (L5 and S1) than GPS systems (L1 and L2), it is not possible to use the GPS data-driven study for NavIC based location calculations directly. Thus there is a need for a specialized ionospheric study for NavIC systems. In addition, the ionospheric delay is directly proportional to Slant Total Electron Content (STEC) which is dependent upon diurnal and seasonal solar activity. To achieve accurate positioning facilities, there is also a need for evaluation for seasonal variability of ionospheric delay correction for NavIC receivers. This paper deals with the STEC estimation; its smoothing, and removal of instrumental biases from STEC. The determined true STEC has been used to determine first-order ionospheric delay at L5 and S1 frequencies. The delay at S1 has been found less (2 to 7m) as compared to L5 (10 to 30m). Furthermore, the seasonal variability of ionospheric delay has been analyzed using about 19 months of data (from June 2017 to December 2018) and found that the ionospheric delay follows unique seasonal characteristics which can be utilized for delay modeling. It has been also observed that the geostationary satellites of the NavIC system are more appropriate than geosynchronous satellites for ionospheric related studies.

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Satellite Navigation and Sources of Errors in Positioning: A Review

Cited by 16 publications

References 9 publications

Transmission Control of Cross‐Regional Heterogeneous Networks for Direct Position Determination

Transmission Control of Cross‐Regional Heterogeneous Networks for Direct Position Determination

Evaluation of Seasonal Variability of First-Order Ionospheric Delay Correction at L5 and S1 Frequencies Using Dual-Frequency NavIC System

Evaluation of Seasonal Variability of First-order Ionospheric Delay Correction at L5 and S1 Frequencies Using Dual-frequency Navic System

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