A study of ionospheric effects on IRNSS/NavIC positioning at equatorial latitudes

Dey, Abhijit; Joshi, L. M.; Chhibba, Rohan; Sharma, Nitin

doi:10.1016/j.asr.2020.09.038

Cited by 14 publications

(6 citation statements)

References 36 publications

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“…The triple frequency IRNSS receiver being unequipped to provide S 4 , it was calculated from C/N O using 60 samples, each collected every second, using the following equation (Braasch & Van Dierendonck, 1999;Chakraborty et al, 2017;Dey et al, 2021).…”

Section: Spectral Analysis Methodsmentioning

confidence: 99%

{\mathrm{S}}_{4}={\left[\frac{\left\langle {S}_{i}^{2}\right\rangle -{\left\langle {S}_{i}\right\rangle }^{2}}{\left\langle {S}_{i}^{2}\right\rangle }\right]}^{\tfrac{1}{2}}

where

{S}_{i}={10}^{\left(0.1\times {\mathrm{C}/\mathrm{N}}_{\mathrm{O}}\right)}

.…”

Section: Methodsmentioning

confidence: 99%

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Multi‐Wavelength (L and S Band) Study of Ionospheric Irregularities From an Anomaly Crest Location

2023

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This paper reports observation of moderate to intense scintillations, at S band of Indian Regional Navigation Satellite System (IRNSS). During current solar cycle 25, these occurrences are probably being reported for the first time, from a low‐latitude station Calcutta (22.58°N, 88.38°E geographic; magnetic dip 34.54°), located near the northern crest of Equatorial Ionization Anomaly. Efforts have been made to analyze irregularity dynamics at IRNSS S band, along with a comparative study at GNSS L1 to characterize occurrence and evolution of multiscale irregularity structures. Power spectral analysis technique has been applied on recorded C/NO, during scintillation patches, to measure east‐west zonal drift velocity. Efforts are also made to study intensity of signal perturbation at L5 frequency of IRNSS, compared to S band, when observed simultaneously, during period of ionospheric scintillation. Concurrent irregularity dynamics at L1, L5, and S band, particularly from a low‐latitude station, has not been extensively reported earlier. Data is recorded during vernal equinox (February–April 2022) of current solar cycle. Results of this study show occurrence of simultaneous night‐time scintillation at L1, L5, and S band. East‐west zonal drift velocity of irregularity, obtained from S band observations are found to decrease with the progress of time during 20–23 LT having a maximum value of 125 m/s. At GNSS L1, hourly average value of the velocity, is observed to maximize during 20–21 LT. Simultaneous observation of scintillation effects at L5 and S band of IRNSS led to loss‐of‐lock at L5, while no such occurrence was noted at S band.

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Section: Spectral Analysis Methodsmentioning

confidence: 99%

{\mathrm{S}}_{4}={\left[\frac{\left\langle {S}_{i}^{2}\right\rangle -{\left\langle {S}_{i}\right\rangle }^{2}}{\left\langle {S}_{i}^{2}\right\rangle }\right]}^{\tfrac{1}{2}}

where

{S}_{i}={10}^{\left(0.1\times {\mathrm{C}/\mathrm{N}}_{\mathrm{O}}\right)}

.…”

Section: Methodsmentioning

confidence: 99%

Multi‐Wavelength (L and S Band) Study of Ionospheric Irregularities From an Anomaly Crest Location

2023

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“…Regional satellite-based navigation systems are also extremely useful in RS&GIS applications [13,14]. In a study by Dey et al (2020) on IRNSS signals, the diurnal variation of the position error indicated a maximum during afternoon hours, coinciding with the time of maximum total electron content (TEC) over the equatorial ionization anomaly (EIA) crest region [15].…”

Section: Regional Satellite-based Navigation Systemsmentioning

confidence: 99%

Terrestrial and Satellite-Based Positioning and Navigation Systems—A Review with a Regional and Global Perspective

Bhardwaj

2020

7th International Electronic Conference on Sensors and Applications

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Satellite-based navigation techniques have revolutionized modern-day surveying with unprecedented accuracies along with the traditional and terrestrial-based navigation techniques. However, the satellite-based techniques gain popularity due to their ease and availability. The position and attitude sensors mounted on satellites, aerial, and ground-based platforms as well as different types of equipment play a vital role in remote sensing providing navigation and data. The presented review in this paper describes the terrestrial (LORAN-C, Omega, Alpha, Chayka) and satellite-based systems with their major features and peculiar applications. The regional and global navigation satellite systems (GNSS) can provide the position of a static object or a moving object i.e., in Kinematic mode. The GNSS systems include the NAVigation Satellite Timing And Ranging Global Positioning System (NAVSTAR GPS), of the United States of America (USA); the Globalnaya navigatsionnaya sputnikovaya sistema (GLObal NAvigation Satellite System, GLONASS), of Russia; BEIDOU, of China; and GALILEO, of the European Union (EU). Among the initial satellite-based regional navigation systems included are the TRANSIT of the US and TSYKLON of what was then the USSR which became operational in the 1960s. Regional systems developed in the last decade include the Quasi-Zenith Satellite System (QZSS) and the Indian Regional Navigation Satellite System (IRNSS). Currently, these global and regional satellite-based systems provide their services with accuracies of the order of 10–20 m using the trilateration method of surveying for civil use. The terrestrial and satellite-based augmented systems (SBAS) were further developed along with different surveying techniques to improve the accuracies up to centimeters or millimeter levels for precise applications.

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“…Here the results obtained through the monitoring of NavIC signals are extended to mitigate the effects of the ionosphere on S-band tracking radars in real time to improve the target trajectory predictions experimentally instead of model-based theoretical predictions. Works on ionospheric study have been done exclusively for NavIC by various researchers (Venkata Ratnam et al., 2018; Desai and Shah, 2019, 2020, Bhardwaj et al., 2020; Dey et al., 2021) but they were primarily are restricted to ionospheric research. This research paper is based on the results of experiments using the S-band NavIC signal for real-time improvement of S-band tracking radar performance in a missile test range.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric correction of S-band tracking radar data using NavIC S-band signals in missile test range applications

et al. 2023

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In missile test ranges, complex missions demand precise trajectory generated by radar. Both the radar and Global Navigation Satellite System (GNSS) signals are affected by atmospheric effects, degrading their accuracy and performance. The Indian Regional Navigation Satellite System/Navigation with Indian Constellation (IRNSS/NavIC) transmits signals in the S-band together with the L-band. This paper presents a novel experimental technique to improve the tracking accuracy of S-band radars using the concurrent NavIC S-band signal. The ionospheric delay using the NavIC S-band signal is calculated first, and the results are used to improve the trajectory data of simultaneously operating S-band radars. This is a unique application of the NavIC S-band signals apart from its conventional usage. During a launch mission, for low elevation angles, the ionospheric error is found to be ~130 m while at higher elevation angles the error values are found to be ~1–3 m. The concept is validated using data from a missile test mission. This report on the use of S-band GNSS signals for the correction of S-band radar range data offers a clear advantage of simplicity and accuracy.

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A study of ionospheric effects on IRNSS/NavIC positioning at equatorial latitudes

Cited by 14 publications

References 36 publications

Multi‐Wavelength (L and S Band) Study of Ionospheric Irregularities From an Anomaly Crest Location

Multi‐Wavelength (L and S Band) Study of Ionospheric Irregularities From an Anomaly Crest Location

Terrestrial and Satellite-Based Positioning and Navigation Systems—A Review with a Regional and Global Perspective

Ionospheric correction of S-band tracking radar data using NavIC S-band signals in missile test range applications

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