Accession Number : ADA262655


Title :   Development of an Airborne MMW FM-CW Radar for Mapping River Ice


Corporate Author : DARTMOUTH COLL HANOVER NH


Personal Author(s) : Yankielum, Norbert E ; Ferrick, Michael G ; Weyrick, Patricia B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262655.pdf


Report Date : Jan 1993


Pagination or Media Count : 15


Abstract : Analyses of a river's freezeup ice cover stability and its breakup rely on detailed knowledge of the cover's thickness and the variability of that thickness. A high-resolution, millimeter wave (26.5- to 40-GHz) Frequency Modulated-Continuous Wave radar with real-time data acquisition and digital signal processing and display capability was deployed from a low-flying (3-10 m) helicopter to continuously acquire, process and display data during an ice thickness profiling survey of a 24-km study reach. A nominal sheet ice thickness of 50 cm, occasional areas of new ice sheet as thin as 5 cm, open leads, and massive ice accumulations on the order of 5 m thick were encountered. Radar profiling data agreed with ground truth from borehole measurements of the sheet ice, and provided a more detailed view of the ice conditions than that obtained from a low altitude video survey. The radar system provided rapid, safe and accurate data acquisition, allowing detailed mapping of the ice conditions throughout the reach.... Airborne, High resolution radar, Millimeter waves, River ice, FM-CW radar, Ice profiling, Radar remote sensing.


Descriptors :   *RADAR , *ICE FORMATION , *ICE , *RIVERS , SIGNAL PROCESSING , FREQUENCY , MEASUREMENT , THICKNESS , REAL TIME , AIRBORNE , CONTINUOUS WAVE RADAR , CONTINUOUS WAVES , MILLIMETER WAVES , HIGH RESOLUTION , BOREHOLES , HELICOPTERS , SURVEYS , DATA ACQUISITION , MAPPING , ACCUMULATION , ALTITUDE , LOW ALTITUDE


Subject Categories : Snow, Ice and Permafrost
      Active & Passive Radar Detection & Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE