The spreadsheet attenuation model (SAM) has been developed for assessing the atmospheric attenuation of millimeterwave (MMW) radars operating at frequencies up to 1000 GHz and at altitudes from sea level to 25 km. The operational frequency windows can be determined as well as the sensitivity of the MMW radar range to the attenuation factor contained in the radar equation. Predictions are presented for a MMW radar operating with a line of sight looking upwards and horizontally at frequencies 210, 400, 680, 880, and 935 GHz.
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