Accession Number : AD0708444

Title :   THE EFFECT OF AMPLITUDE PULSATIONS OF A RECEIVED SIGNAL ON THE OPERATION OF A TRACKING DIRECTION FINDER WITH CONICAL SCANNING,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Taraskin,A. M. ; Teterin,R. V.

Report Date : 17 APR 1970

Pagination or Media Count : 15

Abstract : Because in a tracking direction finder with conical scanning tracking breakdown can result from signal amplitude pulsations, the parameters of the noise in the form of harmonic oscillations are evaluated by using simulation techniques. The analysis involves a Taylor series expansion of the output voltage. Expressions are developed for the antenna directivity and for tracking characteristics. The analysis confirms the high chance of tracking breakdown from multiplicative noise at frequencies close to the scanning frequency. The target tracking error is determined by noise levels, their frequency, and the target speed. The error is larger than the dynamic error without noise, even if the frequency lies outside the effective noise band. The region of the noise parameters in which the breakdown occurs depends to a small degree on the direction finder quality, and to a larger degree on the ratio of the target speed to the limitation level of the antenna rotation speed. The degree of effectiveness of the pulsating noise is directly related to the degree of concentration of its spectrum at the scanning frequency. Any theoretical analysis used must take into consideration the antenna rotation speed as the main factor controlling the onset of breakdown. (Author)

Descriptors :   (*DIRECTION FINDING, TRACKING), SCANNING, ERRORS, RADIOFREQUENCY INTERFERENCE, STABILITY, USSR

Subject Categories : Direction Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE