Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/32367
Title: Terrain Analysis by Electromagnetic Means. Report 2, Radar Responses to Laboratory Prepared Soil Samples
Authors: Lundien, Jerry R.
Mobility and Environmental Systems Laboratory (U.S.)
Keywords: Radar
Soils--Electric properties
Soil moisture--Measurement
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (U.S. Army Engineer Waterways Experiment Station);no. 3-693 rept.2
Abstract: Laboratory tests were conducted with radar sensors to detect the presence of and measure the depth to subsurface interfacec; when the surface was bare, and to determine the influence of vegetation at various stac;es of growth on radar responses. A secondary purpose was to continue earlier studies to relate radar returns and the electrical constants that they provided to moisture content and density of samples. Large laboratory samples were prepared at various moisture contents and densities and with various depths to a subsurface metal plate. Standard pulsed radar sensors operatinc; with frequencies of 297, 5870, 9375, and 34, 543 megacyclec/sec and directed at various angles of incidence to the surface were employed. The results of this laboratory study indicate that the standard pulsed radar sensors can provide information that will permit an estimate of the moisture content of deep, homoc;eneous soil samples and the detection of surface vegetation of various heights. Radar cignatures of vegetationcovered soil were more significantly altered at Ka-, X-, and C-band frequencies than at P-band frequencies. However, standard pulsed radar sensors used monochromatically cannot provide infonnation for predicting depth to subsurface interfaces or for directly indicating the presence of a subsurface interface. The systematic manner in which soil depths were varied in this study permitted an analytical solution to the problem of measuring depths of layers and led to the conclusion that properly designed radar systems could measure depths to subsurface interfaces. Three such systems are proposed.
Description: Technical Report
Gov't Doc #: Technical Report No.3-693 Report 3
URI: https://hdl.handle.net/11681/32367
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