ECHO SOUNDING APPARATUS AND ECHO SOUNDING METHOD

摘要

An echo sounding apparatus which is attached to a moving object and detects a measurement target in the water, including: a transmission signal forming unit that generates a pseudo noise sequence signal and forms a transmission signal by modulating a carrier signal by the pseudo noise sequence signal of transmission timing; a transmitting unit that transmits the transmission signal as an ultrasonic wave into the water; a receiving unit that receives a reception signal including a true echo, a ghost of the transmission signal, and a ghost of the reception signal; a correlator that measures a distance to the measurement target based on a time difference between the transmission signal and the true echo by executing a correlating process to the reception signal by the pseudo noise sequence signal; and a ghost eliminating circuit that eliminates the ghost of the transmission signal and/or the ghost of the reception signal.