Abstract—The radiometers for probing water vapor, temperature and cloud liquid water do not show the high accuracy and stability which is needed for some applications like turbulent weather conditions. The Form of direction delay from atmospheric water vapor is a main error source in geodetic measurements made with VLBI. A dual channel water vapor radiometer, operating near the 22GHz water vapor line , and measuring water vapor-induced delay with good conditions. Theory shows that water vapor direction delay ΔLV is related to a linear combination of saturation-corrected sky brightness temperatures, measured the water vapor line. Sky brightness temperatures are saturation-corrected or "linearized" using estimates of effective sky temperature made from surface temperature. A systematic method for reducing dual-frequency water vapor radiometer data to water vapor path delay has been developed Coefficients are found from a regression of theoretical brightness temperatures versus radiosonde measured delay. Regression solutions are constrained to remove liquid water contributions and to give the correct slope for radiometer versus radiosonde path delay.

Index Terms—Water vapor path, atmospheric water vapor, spacecraft.

A. K. Aldhafari is with School of Electronics Engineering and Information , Beihang University, China (e-mail: sabocah@hotmail.com)

Cite: Ahmad Khalf Aldhafari, "Diversion Radiometer Data for Water Vapor Direction Delay," International Journal of Computer and Electrical Engineering vol. 5, no. 1, pp. 108-110, 2013.