Ionospheric gradients in S-band navigation signals are estimated and analysed for the NAVIC system. International Journal of Food and Nutritional Sciences, [S. l.], v. 10, n. 3, p. 419–428, 2021. Disponível em: https://ijfans.org/index.php/Journal/article/view/3366. Acesso em: 9 sep. 2026.