| 极低信噪比高动态信号的载波跟踪锁频环鉴别器 |
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| 引用本文： | 韩孟飞,王永庆,吴嗣亮,崔嵬.极低信噪比高动态信号的载波跟踪锁频环鉴别器[J].北京理工大学学报,2009,29(3):245-249. |
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| 作者姓名： | 韩孟飞 王永庆 吴嗣亮 崔嵬 |
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| 作者单位： | 北京理工大学,雷达技术研究所,北京,100081 |
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| 摘 要： | 提出一种新的锁频环(FLL)鉴别器设计思路.在回波信号多普勒变化率较小的前提下,将正交解调后的差信号视为线性调频(LFM)信号,同时提取其起始频率和频率变化率作为FLL误差控制量,增强了FLL容忍高动态信号的能力. FFT鉴别算法和点积叉积鉴频算法在频率跟踪的不同阶段相互配合构成鉴别器,既获得了宽的鉴别范围又获得了高的鉴别精度. 针对极低信噪比情况下偶发鉴别野值的问题,提出了行之有效且实现简单的野值识别与剔除算法. 仿真结果表明上述思路可行,采用该鉴别器的FLL在信噪比低至-40 dB时能够容忍较高动态变化,且频率跟踪精度达0.2 Hz.
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| 关 键 词： | 鉴别器 载波频率跟踪 极低信噪比 高动态 |
| 收稿时间： | 2008/7/11 0:00:00 |
FLL Discriminator for Carrier Tracking of Extremely Low-SNR High-Dynamic Signals |
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| HAN Meng-fei,WANG Yong-qing,WU Si-liang and CUI Wei.FLL Discriminator for Carrier Tracking of Extremely Low-SNR High-Dynamic Signals[J].Journal of Beijing Institute of Technology(Natural Science Edition),2009,29(3):245-249. |
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| Authors: | HAN Meng-fei WANG Yong-qing WU Si-liang and CUI Wei |
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| Institution: | Radar Research Lab;Beijing Institute of Technology;Beijing 100081;China |
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| Abstract: | A novel design idea for frequency-locked-loop(FLL) discriminator is proposed,under the premise of changing rate of frequency-rate in returned signal is rather small,the signal after quadrature-demodulation can be regarded as a linear frequency-modulated(LFM) signal,by using estimations of its initial frequency and frequency rate as error control quantities of FLL,FLL's toleration ability to high dynamic signals is greatly enhanced.FFT discriminator and dot-product cross-product discriminator are exploited b... |
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| Keywords: | discriminator tracking of carrier frequency extremely-low-SNR high-dynamic |
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