Accession Number : AD0768025

Title :   Wave Polarization Measurements in HF Short Range Radio Location.

Descriptive Note : Technical rept. no. 45,

Corporate Author : ILLINOIS UNIV URBANA RADIOLOCATION RESEARCH LAB

Personal Author(s) : Glenn,William M. , Jr. ; Bailey,Albert D.

Report Date : AUG 1973

Pagination or Media Count : 67

Abstract : Wave polarization measurements in HF radiolocation are often necessary but not sufficient per se for complete solution of the radiolocation problem. There are cases where the radio signals arrive via steeply downcoming paths. In these latter cases polarization measurements alone may be sufficient to fix the most probable range of the signal source. The report discusses the design, construction and testing of a radio polarimeter system for use in the neighborhood of 5 MHz. In addition to the three-orthogonal-dipole-antenna element array, it uses quadrature hybrids, a matched in gain and phase triple-channel radio receiver and associated logic to separate the two characteristic polarizations. The systems are shown to be successful when working under the conditions and constraints of the design. Gravity waves and traveling disturbances in the ionosphere will produce additional effects which have not been considered here. (Author)

Descriptors :   (*RANGE FINDING, RADIO EQUIPMENT), POLARIZATION, POSITION FINDING, HIGH FREQUENCY, IONOSPHERIC PROPAGATION, ANGLE OF ARRIVAL

Subject Categories : Direction Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE