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Two novel automatic frequency tracking loops

机译:两个新颖的自动频率跟踪环路

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摘要

Two automatic-frequency-control loops are introduced and analyzed in detail. The algorithms are generalizations of the well-known cross-product automatic-frequency-control loop with improved performance. The first estimator uses running overlapping discrete Fourier transforms (DFTs) to create a discriminator curve proportional to the frequency estimation error, whereas the second one preprocesses the received data and then uses an extended Kalman filter to estimate the input frequency. The algorithms are tested by computer simulations in a low carrier-to-noise-ratio (CNR) and highly dynamic environment. The algorithms are suboptimum tracking schemes with a larger frequency error variance compared to an optimum strategy, but they offer simplicity of mechanization and a CNR with a very low operating threshold.
机译:介绍并分析了两个自动频率控制环路。该算法是众所周知的跨产品自动频率控制回路的概括,具有改进的性能。第一个估计器使用连续重叠的离散傅立叶变换(DFT)来创建与频率估计误差成比例的鉴别器曲线,而第二个估计器则对接收到的数据进行预处理,然后使用扩展的卡尔曼滤波器来估计输入频率。该算法在低载噪比(CNR)和高动态环境中通过计算机仿真进行了测试。与最优策略相比,该算法是次优跟踪方案,具有较大的频率误差方差,但它们提供了机械化的简便性以及具有非常低的操作阈值的CNR。

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