Ground-based microwave radiometer is the main device to remotely sense atmosphere passively which can detect the water vapor density, temperature, integral water vapor, etc. Because of the influence of liquid water in cloud on the brightness temperature measured by microwave radiometer, the cloud needs to be modeled to retrieve the parameters of atmosphere. However, the difference between cloud model and actual cloud may bring on error in retrieval. Based on the relation between absorption coefficient of liquid water and frequency, a dual-frequency method of eliminating liquid water radiation which is not based on modeling cloud is put forward to retrieve the parameters of cloudy atmosphere. Historical radiosonde data are employed in the calculation of retrieval coefficients to profile the water vapor. The simulation and experiment results show that the dual-frequency method can eliminate the affection of liquid water effectively. So the error in modeling cloud can be avoided to improve the retrieval precision. The integral water vapor in cloudy atmosphere is also retrieved by the dual-frequency method, and the precision is almost the same with the method of modeling cloud.
2. Westwater, , E. R., "The accuracy of water vapor and cloud liquid determination by dual-frequency ground-based microwave radiometry," Radio Science,, Vol. 13, 677-685, 1978.
3. Bonafoni, S., F. Alimenti, G. Angelucci, and G. Tasselli, "Microwave radiometry imaging for forest fire detection: A simulation study," Progress In Electromagnetics Research, Vol. 112, 77-92, 2011.
4. Li, , S., , X. Zhou, B. Ren, H.-J. Sun, and X. Lv, "A compressive sensing approach for synthetic aperture imaging radiometers," Progress In Electromagnetics Research, Vol. 135, 583-599, 2013.
5. Aluigi, , L., L. Roselli, S. M. White, and F. Alimenti, "System on-chip 36.8 GHz radiometer for space-based observation of solar °ares: Feasibility study in 0.25 ¹m SiGe BiCMOS technology," Progress In Electromagnetics Research, Vol. 130, 347-368, 2012.
6. Kim, , W.-G., N.-W. Moon, J. Kang, and Y.-H. Kim, "Loss measuring of large aperture quasi-optics for w-band imaging radiometer system," Progress In Electromagnetics Research, Vol. 125, 295-309, 2012.
7. Marzano, , F. S., , E. Fionda, P. Ciotti, and A. Martellucci, "Ground-based multifrequency microwave radiometry for rainfall remote sensing," IEEE Transactions on Geoscience and Remote Sensing, Vol. 40, No. 4, 742-759, 2002.
8. Deuber, , A. Haefele, D. G. Feist, L. Martin, N. Kampfer and G. E. Nedoluha, "Middle atmospheric water vapour radiometer (MIAWARA): Validation and first results of the LAPBIAT Upper Tropospheric Lower Stratospheric Water Vapour Validation Project (LAUTLOS-WAVVAP) campaign," Journal of Geophysical Research,, Vol. 10, No. D13306, 1-10, 2005.
9. Doran, , J. C., S. Zhong, J. C. Liljegren, and C. Jakob, "A comparison of cloud properties at a coastal and inland site at the North Slope of Alaska," Journal of Geophysical Research, Vol. 107, No. D11, 2002.
10. Zhan, X., P. R. Houser, J. P.Walker, and W. T. Crow, "A method for retrieving high-resolution surface soil moisture from hydros L-band radiometer and radar observations," IEEE Transactions on Geoscience and Remote Sensing, Vol. 44, No. 6, 1534-1544, 2006.
11. Cimini, D., , E. R. Westwater, Y. Han, and S. J. Keihm, "Accuracy of ground-based microwave radiometer and ballon-Borne measurements during the WVIOP2000 field experiment," IEEE Transactions on Geoscience and Remote Sensing, Vol. 41, No. 11, 2605-2615, 2003.
12. Giamalaki, , M. I. and I. S. Karanasiou, "Enhancement of a microwave radiometry imaging system's performance using left handed materials," Progress In Electromagnetics Research, Vol. 117, 253-265, 2011.
13. Oikonomou, , A., I. S. Karanasiou, and N. K. Uzunoglu, , "Phased-array near field radiometry for brain intracranial applications," Progress In Electromagnetics Research, Vol. 109, 345-360, 2010.
14. Westwater, , E. R., , Y. Han, M. D. Shupe, and S. Y. Matrosov, "Analysis of integrated cloud liquid and precipitable water vapor retrievals from microwave radiometers during the Surface Heat Budget of the Arctic Ocean project," Journal of Geophysical Research,, Vol. 106, No. D23, 32019-32030, 2001.
15. Barbaliscia, , F., E. Fiona, and P. G. Masullo, "Ground-based radiometric measurements of atmospheric brightness temperature and water contents in Italy," Radio Science, Vol. 33, No. 3, 697-706, 1998.
16. Cimini, D., , F. Nasir, E. R. Westwater, V. H. Payne, and D. D. Turner, "Comparison of ground-based millimeter-wave observations and simulations in the Arctic winter," IEEE Transactions on Geoscience and Remote Sensing, Vol. 47, No. 9, 3098-3106, 2009.
17. Rarette, , P. E., , E. R. Westwater, Y. Han, A. J. Gasiewski, and M. Klein, "Measurement of low amounts of precipitable water vapor using ground-based millimeterwave radiometry," Journal of Atmospheric and Oceanic Technology,, Vol. 22, 317-337, 2005.
18. Cimini, , D., , E. R. Westwater, and A. J. Gasiewski, "Temperature nd humidity profiling in the Arctic using ground-based millimeter-wave radiometry and 1 DVAR," IEEE Transactions on Geoscience and Remote Sensing, Vol. 48, No. 3, 1381-1388, 2010.
19. Ware, , R., , P. Herzegh, F. Vandenberghe, J. Vivekanandan, and E. Westwater, "Ground-based radiometric profiling during dynamic weather conditions," Journal of Applied Meteorology,, 2003.
20. Zaharis, , Z. D., K. A. Gotsis, and J. N. Sahalos, "Adaptive beamforming with low side lobe level using neural networks trained by mutated boolean PSO," Progress In Electromagnetics Research, Vol. 127, 139-154, 2012.