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* Detection of ice bottom surface requires frequencies in the range of 0.1 to 0.3 GHz to overcome the high dielectric loss in complex scattering medium.
* Detection of ice top surface is achieved with higher range of frequencies 0.8 to 1.2 GHz.
* Utilization of wide radar bandwidth (0.1 - 1.2 GHz) enables fine vertical resolution.
* Complementary sensors include laser altimeter (detects snow surface), snow radar (snow depth, 4-8 GHz) or radar altimeter (ice top surface).