1Institute of Radiophysics and Electronics, University of Calcutta, Kolkata- 700 009, India
2Dumkal Institute Of Engineering & Technology, W.B.U.T, Murshidabad-742406, India
3Instituto Nacional de Pesquisas Espaciais-INPE, Centro de Previsa˜o de Tempo e studos, Clima´ ticos-CPTEC Road, Dutra, km 40, Cachoeira Paulista, SP-12630000, Brazil
Online published on 9 December, 2013.
The most promising technique available for making the vapor measurement is the use of passive microwave radiometry. The dual frequency technique for taking care of unwanted signal from non-prcipitable liquid water is the world-wide accepted technique. Keeping these in mind, an overview has been presented for the radiometric estimation of propagation delay of the microwave signal. This review covers the basic aspects to be taken care of for the measurement. The propagation path delay in temperate and tropical locations is highlighted along with the contribution of water vapor in base line determination.
Microwave, propagation delay, radiometry, water vapor, liquid water
