Forward-looking imaging sonar display method for visual fishing of underground fallen objects

The invention discloses an underground foresight imaging sonar display method. The method comprises the following steps: 1) receiving and storing single-period beam original data; 2) performing interpolation processing, namely storage, on original single-cycle data; 3) drawing a two-dimensional interface; 4) establishing and updating a three-dimensional matrix; and 5) drawing a three-dimensional picture. According to the method, a two-dimensional display picture based on single-cycle data and a three-dimensional display picture which is based on multi-cycle data and is continuously updated can be obtained at the same time, the purpose of accurately mastering the form and position information of an underground fallen object before fishing construction is achieved, and the two-dimensional display picture is displayed by adopting a polar coordinate graph and a B-T coordinate graph at the same time; and switching and calling can be carried out according to actual requirements in the fishing operation. The downhol