Accession Number : AD0684482

Title :   SOME ELEMENTS OF FM RANGE MEASURING -- SPECTRAL ANALYSIS.

Descriptive Note : Final rept.,

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE INDUSTRIAL RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : McAlpine,G. A. ; Dammann,J. F. ; Highfill,J. H. ; Isaacs,J. C.

Report Date : FEB 1969

Pagination or Media Count : 261

Abstract : Three factors, influencing the performance of FM distance measuring systems generally, were considered with respect to their specific effects on the spectrum of the post mixer signal: (1) Two forms of the modulating signal were studied: (a) A periodic, triangular sweep frequency modulating signal, and (b) A random period triangular sweep frequency modulating signal; (2) Nonlinearity in the frequency-to-modulating voltage characteristic was investigated for three different nonlinear characteristics, (3) Target characteristics were studied with an area target model, two different beam patterns and various surface conditions. Each study in general consisted of appropriate mathematical development of a computational model and then presentation and discussion of calculated spectral data, comprising a parametric study of the effect involved. In the random period study two independent approaches were pursued and results were found to be in essential agreement. (Author)

Descriptors :   (*RADAR, FREQUENCY MODULATION), (*RANGE FINDING, FREQUENCY MODULATION), POWER SPECTRA, NUMERICAL ANALYSIS, MODULATION, NONLINEAR SYSTEMS, INTEGRAL TRANSFORMS, RADIO ALTIMETERS, RADAR REFLECTIONS, COMPUTER PROGRAMS, MATHEMATICAL MODELS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE