Summary Atmospheric delays are one of the limiting error sources in gPs Delays are nearly always estimated At low elevation angles there can be problems with mapping functions sled probogmneven: gradient es。 Estimated delays be used for weather forecasting if latency <2 hrs Class web page has links to some sites that deal with GPS atmospheric delay estimates 0409/03 12540Lec1504/09/03 12.540 Lec 15 25 Summary error sources in GPS – mapping functions – unsolved problem even with gradient estimates. – Estimated delays can be used for weather forecasting if latency <2 hrs. • Atmospheric delays are one of the limiting • Delays are nearly always estimated: At low elevation angles there can be problems with Spatial inhomogenity of atmospheric delay still • Class web page has links to some sites that deal with GPS atmospheric delay estimates 13