Ionospheric Response to 22-23 June 2015 Storm as Investigated Using Ground-Based Ionosondes and GPS Receivers Over India

Motor vehicle crash countermeasures often are selected after an extensive data analysis of the crash history of a roadway segment. The value of this analysis depends on the accuracy or precision with which the crash itself is located. yet this crash location only is as accurate as the estimate of the police officer. Global Positioning System (GPS) technology may have the potential to increase data accuracy and decrease the time spent to record crash locations. Over 10 months, 32 motor vehicle crash locations were determined by using both conventional methods and hand-held GPS receivers, and the timeliness and precision of the methods were compared. Local crash data analysts were asked how the improved precision affected their consideration of potential crash countermeasures with regard to five crashes selected from the sample. On average, measuring a crash location by using GPS receivers added up to 10 extra minutes, depending on the definition of the crash location, the technology employed, and how that technology was applied. The average difference between conventional methods of measuring the crash location and either GPS or a wheel ranged from 5 m (16 ft) to 39 m (130 ft), depending on how one defined the crash location. Although there are instances in which improved precision will affect the evaluation of crash countermeasures, survey respondents and the literature suggest that problems with conventional crash location methods often arise from human error, not a lack of precision inherent in the technology employed.

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Standard Report Format for Global Positioning System (GPS) Receivers and Systems Accuracy Tests and Evaluations

10.21236/ada375388 ◽

2000 ◽

Author(s):

Dick Dickson

Keyword(s):

Global Positioning System ◽

Positioning System ◽

Gps Receivers ◽

Global Positioning ◽

Standard Report

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Measured Effects of a Narrowband Interference Suppressor on GPS Receivers

10.21236/ada460171 ◽

1999 ◽

Cited By ~ 3

Author(s):

P. T. Capozza ◽

B. J. Holland ◽

T. M. Hopkinson ◽

C. Li ◽

D. Moulin ◽

...

Keyword(s):

Narrowband Interference ◽

Gps Receivers

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Longitudinal and Interhemispheric Ionospheric Response to 2009 and 2013 SSW Events in the African‐European and Indian‐East Asian Sectors

Journal of Geophysical Research Space Physics ◽

10.1029/2020ja028570 ◽

2020 ◽

Vol 125 (11) ◽

Author(s):

Geetashree Kakoti ◽

Bitap Raj Kalita ◽

P. K. Bhuyan ◽

S. Baruah ◽

K. Wang

Keyword(s):

East Asian ◽

Ionospheric Response

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Investigation of Ionospheric Response to June 2009 Sarychev Peak Volcano Eruption

Remote Sensing ◽

10.3390/rs13040638 ◽

2021 ◽

Vol 13 (4) ◽

pp. 638

Author(s):

Nikolay Shestakov ◽

Alexander Orlyakovskiy ◽

Natalia Perevalova ◽

Nikolay Titkov ◽

Danila Chebrov ◽

...

Keyword(s):

Acoustic Mode ◽

Global Navigation Satellite Systems ◽

Electron Content ◽

Field Zone ◽

Ionospheric Response ◽

Satellite Systems ◽

Volcano Eruption ◽

Close Proximity ◽

Global Navigation Satellite ◽

Sarychev Peak

Global Navigation Satellite Systems have been extensively used to investigate the ionosphere response to various natural and man-made phenomena for the last three decades. However, ionospheric reaction to volcano eruptions is still insufficiently studied and understood. In this work we analyzed the ionospheric response to the 11–16 June 2009 VEI class 4 Sarychev Peak volcano eruption by using surrounding Russian and Japanese GPS networks. Prominent covolcanictotal electron content (TEC)ionospheric disturbances (CVIDs) with amplitudes and periods ranged between 0.03–0.15 TECU and 2.5–4.5 min were discovered for the three eruptive events occurred at 18:51 UT, 14 June; at 01:15 and 09:18 UT, 15 June 2009. The estimates of apparent CVIDs velocities vary within 700–1000 m/s in the far-field zone (300–900 km to the southwest from the volcano) and 1300–1800 m/s in close proximity toSarychev Peak. The characteristics of the observed TEC variations allow us to attribute them to acoustic mode. The south-southwestward direction is preferred for CVIDs propagation. We concluded that the ionospheric response to a volcano eruption is mainly determined by a ratio between explosion strength and background ionization level. Some evidence of secondary (F2-layer) CVIDs’ source eccentric location were obtained.

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