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高动态条件下改进的EKF载波跟踪环路

DOI: doi:10.3969/j.issn.1006-7043.2011.11.020

Keywords: 高动态, 扩展Kalman滤波器, 环路带宽, 跟踪灵敏度, 失锁概率??

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Abstract:

针对高动态环境下扩展Kalman滤波器跟踪环路的性能,分析了该跟踪环路的带宽特性,建立了环路带宽的数学模型.在此基础上,提出了一种改进的扩展Kalman滤波器跟踪环路.在不同条件下对2种算法的环路带宽特性做了分析比较,结果表明改进算法的环路带宽比NASA提出的常规算法显著减小.在相对加加速度为100 g/s的高动态条件下,对2种算法的跟踪性能进行了仿真,结果显示,与常规算法相比,改进算法的频率误差和失锁概率都明显降低,跟踪灵敏度提高1.3 dB.

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