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一种抑制模糊度函数特定区域旁瓣级的波形设计方法 被引量:1
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作者 周飞 程锦盛 《舰船科学技术》 北大核心 2019年第7期124-128,共5页
针对发射波形为相位编码,探测低速运动目标时存在的模糊度函数旁瓣峰值过高,容易淹没微弱目标的问题,提出了在特定区域最小化模糊度函数旁瓣级的多相编码波形设计优化算法。该算法利用低速运动目标多普勒频移很小的特点,对模糊度函数进... 针对发射波形为相位编码,探测低速运动目标时存在的模糊度函数旁瓣峰值过高,容易淹没微弱目标的问题,提出了在特定区域最小化模糊度函数旁瓣级的多相编码波形设计优化算法。该算法利用低速运动目标多普勒频移很小的特点,对模糊度函数进行简化,提出了离散模糊度函数的概念,在此基础上将模糊度函数峰值附近旁瓣级的最小化转化为离散模糊度函数峰值附近旁瓣级的最小化问题,并利用循环算法进行相位编码的设计。计算机仿真结果表明,所提出的波形设计方法能够有效抑制离散模糊度函数原点附近的旁瓣级,提高探测系统对微弱低速运动目标的检测能力。 展开更多
关键词 旁瓣抑制 多相编码 波形设计 离散模糊度函数
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Similarity measure design and similarity computation for discrete fuzzy data 被引量:7
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作者 LEE Sang-Hyuk PARK Wook-Je JUNG Dong-yean 《Journal of Central South University》 SCIE EI CAS 2011年第5期1602-1608,共7页
The similarity computations for fuzzy membership function pairs were carried out.Fuzzy number related knowledge was introduced,and conventional similarity was compared with distance based similarity measure.The useful... The similarity computations for fuzzy membership function pairs were carried out.Fuzzy number related knowledge was introduced,and conventional similarity was compared with distance based similarity measure.The usefulness of the proposed similarity measure was verified.The results show that the proposed similarity measure could be applied to ordinary fuzzy membership functions,though it was not easy to design.Through conventional results on the calculation of similarity for fuzzy membership pair,fuzzy membership-crisp pair and crisp-crisp pair were carried out.The proposed distance based similarity measure represented rational performance with the heuristic point of view.Furthermore,troublesome in fuzzy number based similarity measure for abnormal universe of discourse case was discussed.Finally,the similarity measure computation for various membership function pairs was discussed with other conventional results. 展开更多
关键词 similarity measure fuzzy number DISTANCE similarity evaluation fuzzy membership function
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