Design method for passive simulator of full space echo characteristics of underwater vehicle

A design method for a passive simulator of full space echo characteristics of an underwater vehicle, comprising the following steps:

• (1) based on a typical underwater vehicle model, obtaining a target strength color map of a divided grid of an underwater vehicle surface, and conducting a color interpolation on a color of the divided grid, so as to smooth a color of the underwater vehicle surface representing a target strength and obtain a distribution cloud map of a bright spot area contributed by the target strength of the underwater vehicle surface;
• according to distribution cloud maps of bright spot areas at multiple incident angles, dividing a scale model of the underwater vehicle into a bow, a midship and a stern, dividing and removing a non-contribution area of the bow, the midship and the stern, and retaining a contribution area to form a partial model of the bow, the midship and the stern;
• (2) conducting a first structure design according to the bow of the partial model, retaining contour lines of an xoy plane semi-ellipse, a first zoy plane circle and an xoz plane semi-ellipse of the bow, and cutting and removing the bow of the partial model to form a four-grid-corner reflector structure composed of arc-shaped plates to serve as a bow simulator;
• (3) conducting a second structure design according to the midship of the partial model, retaining contour lines of an xoy plane square, a second zoy plane circle and an xoz plane square of the midship, and cutting and removing the midship of the partial model to form a twenty-grid-corner reflector structure with an arc shape to serve as a midship simulator;
• (4) conducting a third structure design according to stern of the partial model, retaining contour lines of an xoy plane trapezoid, a zoy plane trapezoid and an xoz plane trapezoid of the stern, and conducting cutting and removing to form a four-grid-corner reflector composed of trapezoidal and arc-shaped plates to serve as a stern simulator;
• (5) according to a time domain echo of a simulated underwater target, placing the bow simulator, the midship simulator and the stern simulator designed in above steps (2)-(4) respectively in bow, midship and stern simulator positions corresponding to the simulated underwater target, and conducting an overall simulator design of the simulated underwater target to obtain a designed overall simulator structure;
• (6) when the designed overall simulator structure of the simulated underwater target is applied in the underwater, using a fixed-depth towed body to determine an underwater position of an overall simulator.