Accession Number : AD0623645

Title :   A METHOD FOR ESTIMATING ATMOSPHERIC NOISE AMPLITUDES AND PHASE ERRORS IN QUENCHED HIGHQ RECEIVING CIRCUITS.

Descriptive Note : Physical sciences research papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Lewis,E. A.

Report Date : SEP 1965

Pagination or Media Count : 44

Abstract : Very narrow-band quenched filters used for studying VLF radio signals differ from conventional narrow-band circuits in that both signal and atmospheric noise impulses cause only brief quasi-sinusoidal outputs instead of a prolonged ringing. The random overlapping of these short noise and signal bursts can cause errors in phase measurements. It is shown that the distribution of phase errors can be calculated from the amplitude distribution of the output noise envelope. The properties of the phase distribution are discussed in detail, the computation required in the general case is illustrated by means of a numerical example. A simple 'time-sequential' method for experimentally obtaining typical amplitude distributions is suggested. (Author)

Descriptors :   (*RADIO RECEIVERS, CIRCUITS), (*NOISE(RADIO), RADIO RECEIVERS), (*PHASE DISTORTION, RADIO RECEIVERS), (*ATMOSPHERICS, NOISE(RADIO)), VERY LOW FREQUENCY, QUENCHING(INHIBITION), IONOSPHERIC PROPAGATION, ATMOSPHERIC ELECTRICITY, FOURIER ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE