Multiple reflection noise production on transmission systems with periodic or quasi-periodic impedance disturbances-A time-domain approach

The problem of multiple reflection noise production on a transmission line with periodic or quasi-periodic impedance disturbances has been studied. This work involved a time domain approach (including a Monte Carlo simulation), reported here, and also a frequency domain approach which has been reported separately. Particular attention was given to the case where pulsewidths
\tau
were of the same order of magnitude as the quantity
(l)/ \upsilon
where
(l)
is the average distance between disturbances and
\upsilon
is the propagation velocity of the signals in the transmission medium. The actual system studied was an array telemetry system used in oceanographic situations. However, the results reported here are general and can be applied directly to any digital transmission system having a periodic or quasi-periodic disturbance structure. In this paper, the time domain model is developed and the results of a Monte Carlo simulation employing this model are presented. Various system noise sensitivity studies are reported, including studies of the effects of noise source position, pulse rise time, and capacitive loading.