Luchinin A.G., Kirillin M.Yu.
The characteristics of a light pulse propagating in water modulated by a radio signal with a frequency varying linearly with time are investigated. The analysis is based on statistical modeling of the pulse and frequency characteristics of the signal and the analytical representation of the signal as a pulsedescribed by a Gaussian function with intrapulse modulation. Changes in the arrival time and the pulse envelope duration caused by the photon pathlength dispersion at distances between the source and receiver up to four white disk visibility depths are estimated. It is shown that these changes may have different signs depending on the modulation frequency range . A comparison was made between arrival times and durations of the pulse with a time-varying frequency and the pulse after matched processing consisting in convolution with the original modulating signal. It is shown that in the investigated range of parameter changes, multiple scattering does not prevent the compression of a complex signal when it is matched processing.
