International Journal of Industrial Education and Technology

GNSS PRECIPITABLE WATER VAPOR

2023-12-10T12:18:13+07:00

This review article centers on tropospheric delays in Global Navigation Satellite System (GNSS) positioning and the methodology for estimating Zenith Total Delay (ZTD), which encompasses Zenith Hydrostatic Delay (ZHD) and Zenith Wet Delay (ZWD). The precise modeling and estimation of these delays are paramount for achieving high-precision GNSS positioning and valuable tools for tropospheric monitoring. The process of GNSS Precipitable Water Vapor (PWV) retrieval entails the calculation of ZWD by subtracting ZHD from ZTD. The Weighted Mean Temperature (Tm) stands out as a crucial parameter influencing the calculations of GNSS PWV, and the accuracy of GNSS PWV hinges on the precision of both Tm and ZHD.

COMPARISON OF SEVERE GEOMAGNETIC STORM EVENT AND LOW-LATITUDE TOTAL ELECTRON CONTENT ANOMALIES

2023-12-18T16:51:54+07:00

In this study, we examined the Total Electron Content (TEC) anomalies at different scales during geomagnetic storms using Global Positioning System (GPS) satellites at low latitudes, which contributed to the catastrophic geomagnetic storm that occurred on March 24^th, 2023. SIET KMITL, Bangkok station (13.729°N, 100.780°E) and KMITL Chumphon station (10.724°N, 99.375°E), Thailand, are the low-latitude GPS stations. After comparing the two GPS TEC stations, we examined the connection between TEC anomalies in the ionosphere and geomagnetic storm sizes. The findings demonstrate that ionosphere anomalies detected by GPS TEC correlate with geomagnetic storm timing. The findings demonstrate that ionospheric TEC anomalies detected by GPS were noticed that the GPS TEC values at both stations increase in proportion to the strength of the geomagnetic storm on days when the storm's intensity is higher. TEC levels rise progressively during periods of high geomagnetic storm severity. Even after the storm passes, TEC stays raised for two to three days before gradually falling back to normal. The maximum value of TEC, about 35 TECU, was observed at the SIET KMITL, Bangkok station (13.729°N, 100.780°E), whereas TEC increased to about 25 TECU at the KMITL Chumphon station (10.724°N, 99.375°E). TEC is high and positively correlated with an increase in days with intense geomagnetic storms. A rise in the frequency of intense geomagnetic storms is positively connected with TEC. However, in typical circumstances, TECs do not decrease in a negative direction during the quiet period.

SKY PLOT VISIBILITY BASED ON BEIDOU AND GPS SATELLITES OVER BANGKOK, THAILAND

2023-12-25T14:01:22+07:00

The Global Navigation Satellite System (GNSS) over the Bangkok region occasionally has spots where its performance could be more consistent and imprecise due to the dust in the sky, the surroundings, and high buildings. As a reason, the area has an impact on satellite signal reception. As a reason, the area has an impact on satellite signal reception. As a reason, the area has an impact on satellite signal reception. It blocks and reflects satellite signals and more than the visibility of GNSS satellites is needed to be useful. We offer a sky visibility analysis based on satellites classification. We provide information on sky visibility estimation for BeiDou and GPS satellites based on direct GNSS receiver measurements.The visibility of BeiDou and GPS satellites is classified by sky plotting techniques. For our proposed analytical evaluation of the visibility satellites over Bangkok on November 8th, 2023, we found that the locations of BeiDou and GPS satellites were at different times and affected the efficiency of analyzing the visibility of sky plots throughout Bangkok, Thailand.

THE STUDY OF LOW-COST ROBOTICS PLATFORM FOR BEIDOU SATELLITES NAVIGATION SYSTEM

2023-12-15T14:20:06+07:00

In this study, a low-cost robot was designed for satellite navigation to promote learning in robotics and navigation satellite systems. Robot technology has been used more widely, including robots for treating disease and patients and service robots. Agricultural robots make robots play a greater role and satellite system are also used in the navigation system with robots as well. Specifically, the BeiDou satellite system was created, constructed, and tested. The BeiDou satellite system is tailored for low-cost robot applications. It utilizes components that allow for the construction of affordable and functional robotic platforms suitable for navigation using BeiDou satellites. The essential components of the low-cost robot platform for BeiDou navigation include an Arduino Nano Central Processing Unit (CPU), motor drive unit, robot structure, sensors, BeiDou satellite receiver module, and power supply. The researchers tested a robot by runing it over distances of 50 m and 100 m at low, medium, and high speeds at Sports Center King Mongkut's Institute of Technology Ladkrabang (KMITL). Tests have shown that satellite signals passing through the ionosphere cause delays that affect the accuracy of the satellite navigation system. The successfully developed low-cost robot platform for BeiDou navigation is named GNSS low-cost robotic (G-LOC robot).

BOOK REVIEW: THE SUN, THE EARTH, AND NEAR-EARTH SPACE

2023-12-08T09:52:53+07:00

We have completed reading "THE SUN, THE EARTH, AND NEAR-EARTH SPACE : A GUIDE TO THE SUN-EARTH SYSTEM" by A. J. Eady, utilizing it to comprehend the sun's impact on the world and life on Earth, and encompassing various global environments. This book has provided insights into radiation's influence on living organisms and diverse human activities such as communication, aviation, and positioning. We have gained knowledge that sunlight reaching Earth generates a magnetic field, directly impacting our planet. Upon reading, we observed that the content of this book aligns with the subject of our research. We are currently exploring the impact of solar-induced electron quantity in the atmosphere on communications systems and applications. We highly recommend this book for those interested in or studying satellite communications and space, as it proves to be both valuable and captivating.