| PLL两点调制在GMSK调制器中的应用 |
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| 引用本文： | 张波权,汤云杰. PLL两点调制在GMSK调制器中的应用[J]. 航空电子技术, 2008, 39(1): 9-13 |
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| 作者姓名： | 张波权 汤云杰 |
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| 作者单位： | 上海埃威航空电子有限公司,上海,200233;上海埃威航空电子有限公司,上海,200233 |
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| 基金项目： | 上海市科技发展基金资助项目(项目编号065115016) |
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| 摘 要： | 分析了HDL数据链发信机设计中的几种GMSK调制方法;阐述了用PLL两点调制的必要性,进而给出了基于PLL的GMSK两点调制的模型。同时,对非线性模型进行线性化等效,列出它们的闭环传递函数,并通过Matlab仿真波形来观察频率响应曲线;最后对调制系统进行ADS仿真,分析系统的收敛性,通过时域、频域调制波形分析,得到最优系统参数。
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| 关 键 词： | VHF数据链 高斯滤波最小频移键控调制 锁相环 频率响应 |
| 文章编号： | 1006-141X(2008)01-0009-05 |
| 修稿时间： | 2007-10-15 |
Application of Two-Point Modulation Based on PLL in GMSK Modulator |
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| ZHANG Bo-quan,TANG Yun-jie. Application of Two-Point Modulation Based on PLL in GMSK Modulator[J]. Avionics Technology, 2008, 39(1): 9-13 |
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| Authors: | ZHANG Bo-quan TANG Yun-jie |
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| Abstract: | First,several methods of GMSK modulation in HDL design of the transmitter are analyzed and the necessity of the usage of two-point modulation based on PLL is described in this paper.Then,a non-linear PLL model is linearized with equivalency and also their closed loop transfer functions are listed.Finally,after the simulation with matlab software and ADS simulation,the optimum parameters in the two-point system are obtained through analysis of the system convergence and the modulation waveform of time-domain and frequence-domain. |
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| Keywords: | VHF data link GMSK modulation PLL frequency response |
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