| 引用本文: | 杨俊,张传胜,周永彬.射频发射模块非线性效应的消除方法.[J].国防科技大学学报,2010,32(4):121-125.[点击复制] |
| YANG Jun,ZHANG Chuansheng,ZHOU Yongbin.The Method of Eliminating Nonlinear Effect for Radio Frequency Module[J].Journal of National University of Defense Technology,2010,32(4):121-125[点击复制] |
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| 射频发射模块非线性效应的消除方法 |
| 杨俊, 张传胜, 周永彬 |
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(国防科技大学 机电工程与自动化学院，湖南 长沙 410073)
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| 摘要: |
| 射频模块存在相位特性的非线性效应，群延迟随频率的变化不再是一个常数，并可能造成输出射频信号的波形失真，而影响精密射频信号源的输出精度。基于递归最小二乘算法的自适应滤波器，提出了消除其非线性效应的新方法。并以GPS模拟源为例，利用其自校模块，采用软件无线电和数字信号处理技术，精确估计出射频模块的模型参数。将基带合成信号通过一个数字逆滤波器，以消除相位的非线性和群延迟随频率的变化。利用自编的仿真程序包，在Matlab中进行了相应的模拟计算。仿真结果表明，该方法可有效地消除相位非线性效应对射频信号的影响，输出信号的波形失真在理论上可控制在0.01％以内。 |
| 关键词: 射频 非线性电路 递归最小二乘算法 自适应滤波器 卫星导航 |
| DOI： |
| 投稿日期：2010-01-19 |
| 基金项目:“十一五”民用航天预研项目(C1320061301)；国家部委基金资助项目(9140A200720209KG0160) |
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| The Method of Eliminating Nonlinear Effect for Radio Frequency Module |
| YANG Jun, ZHANG Chuansheng, ZHOU Yongbin |
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(College of Mechatronics Engineering and Automation, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The nonlinear effect of phase performance and the dependency relationship of envelope delay with the change of frequency for a radio frequency module are owed to a good many factors uncertainty, which may cause the waveform of output radio frequency signal to be distorted. Based on the recursive least square adaptive filter, the novel method to eliminate nonlinear effect of radio frequency module was proposed. By regarding the GPS simulating system as an example, the model parameters were estimated precisely by using its self-revising module, software radio technique and digital signal processing technique. Then in order to eliminate the nonlinear phase and variable envelope delay, the synthetic signal in baseband was processed using a digital filter, which was the inverse filter of radio frequency module. The corresponding computation was accomplished utilizing the self-programming emulating package with the help of Matlab. The simulation results indicate that the method proposed in this paper can eliminate the impact on radio frequency signals by the nonlinear effect of phase, and the waveform distortion of output signals can be reduced to less than 0.01 percent. |
| Keywords: radio frequency module nonlinear circuit recursive least square algorithm adaptive filter satellite navigation |
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