DESCRIZIONE
Described herein relates to a target measuring apparatus (100). The target measuring apparatus (100) includes a transducer (104) configured to transmit a transmission wave into water and configured to generate a reception signal (104a) based on a reflection wave of the transmission wave on a target (106); and a camera (102) configured to take a picture (102a) of the target (106), the camera (102) and the transducer (104) facing a first direction. The target measuring apparatus (100) further includes a target measuring system (200) coupled to the transducer (104) and the camera (102). The target measuring system (200) includes a first length measuring module (202) configured to measure a first length (106a) of the target (106) based on the reception signal, the first length (106a) being measured in a direction parallel with the first direction; a target distance measuring module (204) configured to measure a target distance (102b) between the camera (102) and the target (106) based on the reception signal (104a); a second and third length measuring module (206) configured to measure a second length (106b) and a third length (106c) of the target (106) based on the picture (102a) and the target distance (102b), the second length (106b) being measured in a second direction, the third length (106c) being measured in a third direction perpendicular to the second direction, the second and third directions forming a plane perpendicular to the first direction; and a weight measuring module (208) configured to measure a weight (106d) of the target based on the first length (106a), the second length (106b), and the third length (106c) of the target (106). [Image Omitted]