Combined gnss/fy-4a water vapor chromatography method

A combined global navigation satellite systems/Fengyun series geostationary meteorological satellite 4A (GNSS/FY-4A) water vapor chromatography method, comprising:

• using global navigation satellite system (GNSS) atmospheric precipitable water to process layered water vapor data of a Fengyun series geostationary meteorological satellite 4A (FY-4A) satellite to obtain corrected FY-4A precipitable water vapor (PWV) data;
• using observation data of GNSS and the corrected FY-4A PWV data, calculating a GNSS/FY-4A slant water vapor (SWV) signal emitted from a boundary of a water vapor chromatography area;
• and
• integrating a FY-4A SWV signal after recovering a boundary signal into a GNSS water vapor observation equation, constructing a combined GNSS/FY-4A water vapor chromatography model, using a combined algebraic reconstruction method to solve the combined GNSS/FY-4A water vapor chromatography model, and obtaining water vapor density results.