Precise Point Positioning (PPP) makes use of the undifferenced pseudorange and copyright phase measurements with ionospheric-free (IF) combinations to achieve centimeter-level positioning accuracy. Conventionally. the IF ambiguities are estimated as float values. To improve the PPP positioning accuracy and shorten the convergence time. https://www.diariolahumanidad.com/product-category/calzini-per-bebe-e-bimbi/