Statistical analysis of backscatter data from 300 kHz multibeam echo sounder

摘要

The seafloor high-frequency backscatter average statistics, including the backscatter strength and the backscatter cross section, are statistically analyzed. According to Gamma distribution model of the backscatter cross section, the probability density function (PDF) of the backscatter strength is derived, and it is proved that the backscatter strength approaches a Gaussian distribution. The data recorded by a 300 kHz multibeam echo sounder are used to calculate the backscatter cross section and the backscatter strength at different angles. The statistical distributions of the two kinds of statistics are compared with theoretical distribution models. The results show that Gamma distribution correctly fit the distribution of the backscatter cross section, and Gaussian distribution accurately fit the distribution of the backscatter strength. Furthermore, the estimated parameters of two distribution models vary with the incidence angles.