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This paper presents two space detected Global Positioning System (GPS) signals reflected off sea ice and compares the returned power profiles with independent estimates of ice concentration provided by the Advanced Microwave Scanning Radiometer (AMSR-E) and sea ice charts from the National Ice Center. The results of the analysis show significantly different signals received for each of the GPS reflections. For the first collection, comparisons with ice concentration estimates from AMSR-E anddoi:10.3390/rs2082017 fatcat:3mrogo432rhlzee5haeqezzw2y