What Does ZTD Stand For?

ZTD stands for Zenith Tropospheric Signal Delay

Zenith Tropospheric Signal Delay (ZTD) refers to the time delay experienced by signals, such as those emitted by satellites, as they pass through the Earth's troposphere. This delay is primarily caused by the varying refractive index of the atmosphere due to factors like humidity, temperature, and pressure. Accurate modeling and correction of ZTD are crucial in fields like satellite navigation, geodesy, and meteorology, as they enhance the precision of positioning systems and improve atmospheric data retrieval.