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| Assessment of the Integrity of the GNSS-PPP Heights Data Acquired for the Monitoring of Earth's Dynamism in Benue Trough, Kogi State
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Negedu, Achimugu Amos and Ono, Mathew Nnonyelu
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Abstract:
There is need for assessment of the integrity of the heights generated using GNSS-PPP to enable users have confidence on their accuracy level. GNSS-PPP is dependent on some traditional corrections obtained from global reference stations scattered all over the world. Upon the actualization of these corrections, the receiver positions are greatly improved in terms of accuracy. GNSS observations were carried out on 11 observation points with the multi-frequency v30 Hi target instrument on the static mode. The observations were made at an epoch of 30 seconds for a period of one hour to one hour thirty minutes per station. On completing the satellite data observations, the acquired GNSS raw data were downloaded using a USB cable to the laptop. Subsequently, the GNSS raw data were converted to RINEX using the Hi-target Geomatics office software. The RINEX data converted were then, uploaded to Jason cloud Robukun online post processing solution (robukun.cat/Argonaut-paas-2/). That was where the data processing was carried out online. An online standard deviation calculator was deployed for quick computation and it was obtained from https://www.calculator.net/math/standard-deviation. This online calculator tool does the computation of confidence interval also. The geographical coordinates were uploaded individually and separated each with a comma and submitted. Same was done for the height data each. After sending, the results came back and displayed. The results of standard deviations of the various stations were in millimeters except for some points surrounded by canopy trees, mountains and buildings.
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