Abstract:In view of the complex offshore electromagnetic environment and the huge amount of data, cleaning the fixed tar?gets that have little impact on the situation analysis in the target sea area during the situation analysis, can effectively short?en the time of data processing, reduce the complexity, and improve the efficiency and objectivity of the situation analysis.The existing fixed target cleaning method has low robustness, cannot exclude the interference of abnormal jump data, andrequires high accuracy of data set information, which is not suitable for data processing in complex offshore environment.Therefore, in this paper, a method of maritime fixed-target cleaning based on cycle threshold was proposed, and the experi?ment analysis on the simulation military scene was carried on. The proposed method can eliminate the interference of natu?ral factors, measurement errors and abnormal jump data through the cyclic threshold process, and can also detect the fixedtarget in the sample data set effectively.