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Based on the high frequency (HF) integrated radar cross section (RCS) calculation approach,a technique of detecting major scattering source is developed by using an appropriate arithmetic for scattering distribution and scattering source detection.For the perfect adaptability to targets and the HF of the HF integrated RCS calculation platform,this technique is suitable to solve large complex targets and has lower requirement to the target modeling.A comparison with the result of 2-D radar imaging confirms the accuracy and reliability of this technique in recognition of the major scattering source on complex targets.This technique provides the foundation for rapid integrated evaluation of the scattering performance and 3-D scattering model reconstruction of large complex targets.