수중통신용 광대역 신호를 이용한 해저 반사 손실 추정

Abstract

Performance of acoustic communication through shallow underwater channel is affected by surface and bottom interaction, and the bottom loss has great importance for long-range signal transmission. In 2013, KRISO has performed a shallow-water communication experiment near Jeju island, South Korea, and the experiment aims at evaluating communication link budget as well as measuring the channel fading statistics. The measured sound velocity profiles show the existence of strong thermocline resulting in downward refraction and therefore its long-range signal propagation is strongly dependent on the seabed characteristics. We use a wideband signal which was originally designed for channel impulse response estimation. The signals were recorded using a four-element receiver array with two different source depth configurations which enable observing the seabed at various grazing angles. The estimated bottom loss is used to estimate the transmission losses at longer ranges, and they are compared with the measured values to examine the estimated bottom loss.r communication experiment near Jeju island, South Korea, and the experiment aims at evaluating communication link budget as well as measuring the channel fading statistics. The measured sound velocity profiles show the existence of strong thermocline resulting in downward refraction and therefore its long-range signal propagation is strongly dependent on the seabed characteristics. We use a wideband signal which was originally designed for channel impulse response estimation. The signals were recorded using a four-element receiver array with two different source depth configurations which enable observing the seabed at various grazing angles. The estimated bottom loss is used to estimate the transmission losses at longer ranges, and they are compared with the measured values to examine the estimated bottom loss.