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基于自适应谱峰搜索的脉冲重复间隔最大似然估计 被引量:5

Maximum-Likelihood Pulse Repetition Interval Estimation Based on Adaptive Periodogram Peak Searching
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摘要 高精度的脉冲重复间隔(PRI)估计对于提高现代电子情报(ELINT)系统的辐射源识别能力具有重要意义。将观测的脉冲到达时间(TOA)序列建模成点过程信号,其周期图谱谱峰就对应于PRI的最大似然估计(MLE)。本文提出了一个"两步数值搜索"策略,可以确保搜索到谱峰而达到MLE。仿真表明,在低信噪比以及高脉冲丢失率条件下,本文算法性能远超已有算法。 High-accuracy pulse repetition interval (PRI) estimation is meaningful for enhancing the emitter- identification abilities of modern electronic intelligence (ELINT) systems. The maximum-likelihood estimate (MLE) of PRI can be obtained by locating the peak of periodogram of a point process signal used to model the sequence of the time- of-arrival (TOA) measurements. In this paper, a novel two-step numerical search strategy is proposed to search the peak of the periodogram to ensure maximum-likelihood estimation. Simulation results show that our algorithm outperforms the existing methods, especially under the condition of low signal-to-noise ratio (SNR) or high pulse-missing-rate.
出处 《宇航学报》 EI CAS CSCD 北大核心 2012年第5期635-641,共7页 Journal of Astronautics
基金 国家自然科学基金(61002026)
关键词 雷达 脉冲重复间隔 最大似然估计 周期点过程 周期估计 Radar Pulse repetition interval Maximum likelihood estimation Periodic point process Period estimation
作者简介 叶浩欢(1984-),男,博士研究生,研究方向为电子侦察信号处理与技术、辐射源识别。通信地址:湖南长沙国防科技大学电子科学与工程学院综合电子战实验室(410073)电话:(0731)84573490E—mail:yhh863911@yahoo.com.cn
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