Accession Number : AD0645021

Title :   A METHOD OF MEASURING THE MULTIPATH COMPONENTS OF A FIELD.

Descriptive Note : Technical rept.,

Corporate Author : INSTITUTE FOR TELECOMMUNICATION SCIENCES AND AERONOMY BOULDER COLO

Personal Author(s) : Watterson,C. C.

Report Date : AUG 1966

Pagination or Media Count : 47

Abstract : A description and analysis is presented of a method of making field-strength measurements in a multipath field from which computations can be made of the amplitude, phase, and angle of arrival of each of a number of coherent elliptically-polarized plane-wave multipath components. The method requires that the amplitude and phase of the received signal from a moving dipole or other small-aperture antenna be measured as the antenna is moved successively along three orthogonal straight-line paths. The dynamic range of the amplitude of the multipath components which can be measured is approximately equal to the ratio of the amplitude of the strongest component to the magnitude of the errors of measurement. The angular resolution is approximately equal to the beamwidth of an antenna whose aperture equals the distance of movement of the dipole. The errors in the solutions are least for the strongest multipath components and greatest for the weaker components. In a computer evaluation which used measurements of two-figure accuracy, the stronger component errors were less than one-tenth of a dB in amplitude, several tenths of a degree in phase and about one-tenth of a degree in angle of arrival. Measurements of an actual multipath field have demonstrated the practicality of the technique. (Author)

Descriptors :   (*ELECTROMAGNETIC FIELDS, MEASUREMENT), TEST METHODS, PHASE MEASUREMENT, ANGLE OF ARRIVAL

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE