A fast simulation method for millimeter-wave radiation images of rough sea surface

Ray tracing method is used to simulate millimeter-wave radiation brightness temperature images. This paper proposes a cache – based non – uniform ray acceleration method to solve the low efficiency of the traditional ray tracing method in simulating millimeter-wave radiation images. Unlike the fast simulation methods proposed by Qi (2016) and Yin (2017), this method reduces the number of scattered rays on a rough surface. It adjusts the scattered ray density according to the reflectivity change rate and introduces a caching mechanism. This enables fast simulation of millimeter – wave radiation images of rough sea surfaces. To validate the correctness of the method, the comparison results of the simulation and measurement are proposed. The results show the correctness and acceleration efficiency of the method.