ISKANDARnet IOMOS: Near real‐time equatorial space weather monitoring and alert system in Peninsular Malaysia

Musa, Tajul Ariffin; Leong, Shien Kwun; Abdullah, Khairul Anuar; Othman, Razib M.

doi:10.1029/2012sw000813

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…Meanwhile, the lowest delay was found during the winter-solstice but has a high rate of change of 6·2 in latitudinal direction in comparison to the vernal-equinox and summer-solstice. Figure 3 also shows obvious trends of the delay during the four seasons - it increases significantly with decreasing latitude, which is in agreement with the initial equatorial TEC investigation by Musa et al, (2012).…”

Section: Resultssupporting

confidence: 89%

Spatial and Seasonal Ionospheric Error Growth in DGPS Measurement: A Case Study in Malaysia

et al. 2015

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This paper tackles the Equatorial ionosphere and its effects on Differential Global Positioning System (DGPS) error growth over Malaysia by using a network of GPS Continuously Operating Reference Stations (CORS). Seasonal variation of ionospheric delay has been examined and findings show that the effect of spatial variation of ionospheric errors in DGPS is very significant during the equinoctial seasons. Furthermore, a DGPS regression model was developed and tested during the solar maximum year in 2013 by using internet-based DGPS. The results show that the model is capable of estimating DGPS positional errors for distances of user to reference station less than 680 km.

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Section: Resultssupporting

confidence: 89%

Spatial and Seasonal Ionospheric Error Growth in DGPS Measurement: A Case Study in Malaysia

et al. 2015

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“…During the last decade or so, TEC has emerged as a crucial parameter for satellite‐based navigation and its various applications that demand high precision. It is not surprising that the anomalous departures and sharp gradients in daytime low‐latitude ionospheric TEC severely impede the quality of precise applications [ Musa et al ., ; Astafyeva et al ., ]. Hence, the ionospheric forecast has become a prime topic of research on regional and global scales [ Bust and Mitchell , ; Kutiev et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Climatological response of Indian low‐latitude ionosphere to geomagnetic storms

Suresh

Dashora

2016

JGR Space Physics

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A climatological response of low‐latitude ionosphere to geomagnetic storms is presented using long‐term global ionospheric maps data from June 1998 to June 2015 covering two solar cycles 23 and 24. The results are presented for daytime forenoon and afternoon sectors under minor, moderate, and major ionospheric storm categories based on minimum Dst index criterion. For the first time the effectiveness of storms is identified using monthly standard deviation as an indicator of the day to day variability in equatorial and low‐latitude ionosphere. Thus, results on climatology are definitive and form a database that would be comparable to statistical results from any other longitude and time. Seasonal statistics for total storms, effective positive and negative storms, and amplitude of mean seasonal perturbation in total electron content are obtained. Total and effective storms are found to be higher in solar cycle 23 than in 24 and only a couple of effective storms occurred during low solar activity 2007–2009 that too in minor category. Afternoon sector is found to be favorable for occurrence of maximum number of effective positive storms. A latitudinal preference is found for a given storm to be effective in either time sectors. Equinoctial asymmetry in ionospheric response both in terms of occurrence and perturbation amplitude is found. September equinoxes are found to bear maximum total, effective positive and negative storms. Winters are found more prone to negative storms, whereas summers have recorded minimum number of either of storms and minimum perturbation amplitudes.

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“…The study by Musa et al (2012) verifies that spatial variation of Total Electron Content (TEC) over Malaysia has an inhomogeneous gradient in both North-South and East-West directions (see figure 2).…”

Section: Network Geometrymentioning

confidence: 99%

A Review on Legal Traceability of GNSS Measurements in the Malaysian Cadastral Practice

Gill

Shariff

Omar

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:As the dependency on Global Navigation Satellite System (GNSS) in surveying has been growing over the years, the need for legal traceability of GNSS measurements has become a significant matter. In Malaysia, with the advent of the Malaysia Real-time Kinematic Network (MyRTKnet), GNSS surveying has revolutionised land survey and mapping. Correspondingly, the Department of Survey and Mapping Malaysia (DSMM) amended and published standard regulations and guidelines concerning cadastral survey, i.e., Cadastral Survey Regulations 2009, to include GNSS measurements. However, these regulations and guidelines has not comprehensively incorporated legal traceability of GNSS measurements; which is a prerequisite for cadastral surveys as it requires reliable and conclusive evidence for issues such as boundary disputes. The first objective of this paper is to review and discuss the legal traceability of GNSS measurements. Secondly, it will highlight the current practice and issues, i.e., with regard to legal traceability, within the present Malaysian cadastral regulation and guidelines, in relation to the prevalently adopted Network RTK (N-RTK) technique, GNSS instrument calibrations, and reference stations' accuracy. Lastly, a rudimentary best practice guideline for GNSS surveying in cadastral survey for Malaysia is proposed. It is expected that this paper will contribute to the implementation of a best practice guideline, which is inclusive of legal traceability of GNSS measurements, for the Malaysian cadastral practice.

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ISKANDARnet IOMOS: Near real‐time equatorial space weather monitoring and alert system in Peninsular Malaysia

Cited by 9 publications

References 45 publications

Spatial and Seasonal Ionospheric Error Growth in DGPS Measurement: A Case Study in Malaysia

Spatial and Seasonal Ionospheric Error Growth in DGPS Measurement: A Case Study in Malaysia

Climatological response of Indian low‐latitude ionosphere to geomagnetic storms

A Review on Legal Traceability of GNSS Measurements in the Malaysian Cadastral Practice

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