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Abstract
This article presents a study of the interference effect of the microwave emission of soil during freezing and thawing processes. The microwave brightness temperature (T B) was measured at the C (6.925 GHz), X (10.65 GHz), K (18.7 GHz) and Ka (36.5 GHz) bands using a truck-mounted dual-polarized microwave radiometer. Obvious T B oscillation behaviour was shown in the results, which were compared with both coherent and non-coherent emission models. The characteristics of the measured and modelled results were similar, except for the oscillation frequency and amplitude. This was attributed to the error in estimation of the dielectric constant of frozen soil and some other factors. This effect was important in analysing the experimental data.
Acknowledgements
We thank the National Precise Agriculture Research Station for its help in this experiment. This work is supported by the National Natural Science Foundation of China, No. 41030534 and the National Basic Research Programme of China, No. 2007CB714403.