Impact of ionospheric delay on GNSS in a low-latitude region: a case study of Ogbomoso, Nigeria
Efua A. Ogobor·Eronmhon Augustine Ogobor·Mohammed Shehu Haruna·B.G. Ayantunji·Oluwadara Oyelowo·Adebayo Segun Adewumi
Accurate positioning and timing services are critically dependent on Global Navigation Satellite Systems (GNSS); however, their performance is often degraded by ionospheric delay. This study evaluates the impact of ionospheric delay on GNSS positioning accuracy over Ogbomoso, Nigeria (≈ 8.1° N, 4.2° E), using one year of GNSS observations data recorded at 4 Hz with a u-blox ZED-F9P receiver. The data were converted to RINEX format using the RTKLIB suite and subsequently processed with the GPS-GO