Accession Number : AD0482575

Title :   HIGH-FREQUENCY BACKSCATTER FROM TERRAIN WITH TREES.

Descriptive Note : Technical rept.,

Corporate Author : STANFORD UNIV CA STANFORD ELECTRONICS LABS

Personal Author(s) : Steele, J. G.

Report Date : APR 1966

Pagination or Media Count : 30

Abstract : At high frequency the ground may often be regarded as a plane mirror with negligible backscatter except at vertical incidence. At angles of incidence near grazing, any backscatter is due to objects on or above the ground, such as trees, provided the objects themselves have appreciable cross sections at high frequency. The standing-wave method of measuring radar cross sections was adapted for use at 26 Mc with targets on or above the ground, as described in a previous report. It was then further adapted for measuring cross sections at angles of elevation up to 22.5 deg, by raising the transmitting antenna with a balloon and moving the receiving probe along the transmitter-target line by means of ropes. Targets used were horizontal and vertical aluminum cylinders (using horizontal and vertical polarization, respectively, for the radiation) and an oak tree (using both polarizations). The results are relevant to ionospheric sounding by means of ground backscatter. (Author)

Descriptors :   (*BACKSCATTERING, HIGH FREQUENCY), (*RADAR SIGNALS, BACKSCATTERING), TREES, TERRAIN, RADAR CROSS SECTIONS, CYLINDRICAL BODIES, ALUMINUM, POLARIZATION, ATMOSPHERIC SOUNDING, IONOSPHERE, DATA PROCESSING.

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE