| L波段捷变频频率源关键技术研究 |
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| 引用本文： | 周建明.L波段捷变频频率源关键技术研究[J].哈尔滨工程大学学报,2008,29(12). |
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| 作者姓名： | 周建明 |
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| 作者单位： | 北京理工大学,信息科学技术学院,北京,100081 |
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| 基金项目： | 总装备部预研基金资助项目
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| 摘 要： | 为了研究宽带低杂散的L波段捷变频频率源,采用DDS技术从数学方法上对DDS输出信号模型表达式进行展开和近似,在精度允许范围内将DDS输出信号近似为小信号锯齿波调制正弦波的结果,深入分析了锯齿波的频谱和频率控制字之间的关系.根据信号调制理论分析了DDS输出信号杂散分布及杂散频率和频率控制字之间的关系,DDS杂散谱线数量也与频率控制字相关,得出了相应的规律.结合实际工程和DDS杂散分布规律,设计了L波段(1.225～1.425 GHz)的捷变频频率源,在频率误差允许范围内选择合适的DDS输出频率范围和频率控制字,提高了系统宽带杂散抑制,DDS输出信号经滤波器之后杂散电平优于-83 dBc,经8倍频和滤波后杂散电平优于-70 dBc.
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| 关 键 词： | 直接数字频率合成 相位截断 杂散 捷变频频率源 |
Key technique of an L band fast hopping frequency synthesizer |
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| ZHOU Jian-ming.Key technique of an L band fast hopping frequency synthesizer[J].Journal of Harbin Engineering University,2008,29(12). |
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| Authors: | ZHOU Jian-ming |
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| Affiliation: | School of Information Science and Technology;Beijing Institute of Technology;Beijing 100081;China |
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| Abstract: | Direct digital synthesis(DDS) technology was adopted to implement a wideband low spurious free dynamic range(SFDR) L band fast hopping frequency synthesizer.The signal model was approximated,using a mathematical method.The DDS output signal was modeled as a kind of sine signal modulated by a small toothed signal.The relationship between the spectrum of the toothed signal and word frequency was investigated.Based on modulation theory,the relationships between the spurious spectrum position,spurious frequency... |
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| Keywords: | DDS phase truncation spurs fast hopping frequency synthesizer |
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