Echo sounder and multi-beam echo sounder

摘要

To correct fluctuations, such as those caused by waves, with respect to a marine vessel, without using an acceleration sensor.SOLUTION: Provided is an echo-sounding device which is installed on a mobile body, such as a vessel, to detect a measuring object in the water, and whose depth changes with fluctuations in a vertical direction. The echo-sounding device includes: a transmission signal forming part having a pseudo noise sequence generating circuit for forming a pseudo noise sequence signal, and a modulation signal for forming a transmission signal by modulating a carrier wave signal using the pseudo noise sequence signal of a transmission timing; a transmitting part which periodically transmits the transmission signal, as ultrasound, toward a measuring object located below the mobile body; a receiving part which receives an echo of the ultrasound transmitted from the transmitting part; a correlator which discriminates the echo corresponding to the transmission signal by applying correlation processing to the echo using the pseudo noise sequence signal, and acquires depth raw data from a time difference between the transmission signal and the echo; and a fluctuation correcting part which suppresses a fluctuation constituent by subjecting the depth raw data to fluctuation correction.SELECTED DRAWING: Figure 33