Active and Passive Remote Sensing of Ice.

• Main Author: Kong, Jin A
• Other Authors: MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
• Format: Text
• Language: English
• Published: 1987
• Subjects: Snow; Ice and Permafrost; Active & Passive Radar Detection & Equipment; *BACKSCATTERING; *ICE; *RADAR CROSS SECTIONS; *REMOTE DETECTORS; *SEA ICE; *BISTATIC DETECTION; VOLUME; SCATTERING; LAYERS; THEORY; SCATTERING CROSS SECTIONS; PASSIVE SYSTEMS; MICROWAVES; VARIATIONS; SNOW COVER; COEFFICIENTS; EMISSIVITY; BISTATIC RADAR; Ice; permafrost; Point Barrow; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/ADA179461; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA179461

During the period August 1, 1986 to January 31, 1987, we have studied the volume scattering effects of snow-covered sea ice with a three-layer random medium model for microwave remote sensing. The strong fluctuation theory and the bilocal approximation are applied to calculate the effective permittivities for snow and sea ice. The wave scattering theory in conjunction with the distorted Born approximation is then used to compute bistatic coefficients and backscattering cross sections. Theoretical results are illustrated by matching experimental data for dry snow-covered thick first-year sea ice at Point Barrow. The radar backscattering cross sections are seen to increase with snow cover for snow-covered sear ice, due to the increased scattering effects in the snow layer. The results derived can also be applied to the passive remote sensing by calculating the emissivity from the bistatic scattering coefficients.