采用快速远场近似的降秩电磁流迭代法计算目标与粗糙水面的复合散射，并进一步采用粗糙面分区的多进程并行迭代算法提高其计算速度，分析了降秩电磁流迭代法对散射结果的影响，表明该方法可用于近场复合散射问题的计算；对平板目标与水面间的复合散射进行了计算，计算结果与快速多极子方法（MLFMM）结果符合较好，验证了该算法的有效性．同时，利用造波水池开展了目标与水面近场复合散射的模拟实测，测试与计算结果趋势较为一致．%A new fast far field approximation algorithm is introduced to calculate the composite scattering characteristics of rough surface and the target in near field, by using the reduced-order electromagnetic current iteration method. Also we use the multi-process parallel algorithm to reduce the simulation time and analyze the influence on the results of the reduced-order electromagnetic current iteration. The calculated results by the algorithm described in the paper and the results obtained by the multi-level fast multi-pole method （MLFMM） are in good agreement, so the effectiveness of the algorithm is verified. At the same time, the use of tank to carry out the measurements of near-field complex scattering between the targets and rough surface shows that the test results and the calculation results are very consistent.
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