| 基于混沌振子阵列的扩频信号捕获方法 |
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| 引用本文： | 杨朝斌,牛强军,张再德. 基于混沌振子阵列的扩频信号捕获方法[J]. 宇航计测技术, 2009, 29(3): 4-7 |
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| 作者姓名： | 杨朝斌 牛强军 张再德 |
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| 作者单位： | 1. 四川大学计算机学院,四川成都,610041
2. 空军第一航空学院通导系,四川信阳,464000 |
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| 摘 要： | 在低信噪比下提出了结合混沌振子阵列及相干相关实现对扩频信号的捕获方法．针对混沌振子的数学模型，用混沌系统的相轨迹特性来分析对扩频信号的捕获过程，以Lyapunov指数（LE）作为实现捕获及提取载波多普勒频率的判断依据，再由跟踪环路完成对扩频码相位的跟踪．对DSSS／BPSK仿真结果表明，本方法可以实现扩频信号快速捕获，同时提高了捕获概率及检测灵敏度。
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| 关 键 词： | 直序扩频(DSSS) 捕获相干相关混沌振子阵列Lyapunov指数(LE) |
Acquisition of Spread Spectrum Signals Based on Chaotic Oscillator Arrays |
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| YANG Chao-bin,Niu Qiang-jun,Zhang Zai-de. Acquisition of Spread Spectrum Signals Based on Chaotic Oscillator Arrays[J]. Journal of Astronautic Metrology and Measurement, 2009, 29(3): 4-7 |
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| Authors: | YANG Chao-bin Niu Qiang-jun Zhang Zai-de |
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| Affiliation: | YANG Chao-bin Niu Qiang-jun Zhang Zaide ( 1. School of Computer Science, Sichuan University, Chengdu 610041 ; 2. First Aeronautical College of Air Force, Xinyan 464000) |
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| Abstract: | A acquisition method of spread spectrum（SS） signal is presented by coherent correlation and chaotic oscillator arrays under low SNR. The acquisition process is analyzed from phase plane diagram based on Homles Duffing oscillators model. The lyapunov exponents is used as the key parameter to determine if spread spectrum signals existing and . acquired ,and to detect carrier＇s doppler frequency. After all,the PN code phase is obtained by the tracking loop. The simulation of DSSS/BPSK indicates this acquisition scheme based on chaotic oscillator arrays can acquire DSSS signals quickly and improve acquisition probability and detection sensitivity. |
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| Keywords: | Direct Sequence Spectrum Spread（DSSS） Acquisition Coherent Correlation Chaotic oscillator arrays （COAs） Lyapunov Exponents （LE） |
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