| Generalized ionospheric dispersion simulation method for wideband satellite-ground-link radio systems |
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| 作者姓名： | 周扬 郑哲 吴嗣亮 |
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| 作者单位： | School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China,School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China,School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China |
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| 基金项目： | Supported by the Foundation of Shanghai Aerospace Science and Technology (20120541088); China Postdoctoral Science Foundation (2015M580997) |
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| 摘 要： | A generalized ionospheric dispersion simulation method is presented to verify and test wideband satellite-ground-link radio systems for dispersion robustness. In the method, ionospheric dispersive effects on wideband radio waves are modeled as an allpass nonlinear phase system, thus greatly decreasing the need for signal priori information. To accurately simulate the ionospheric dispersion and reduce the implementation complexity, the system is decomposed into three new allpass subsystems: with a linear phase passing through zero frequency, a constant phase, and a nonlinear phase with zero-offset and quasi-parabolic form respectively. The three subsystems are implemented respectively by the combination of integer-interval delay and fractional delay filter, digital shifting phase and the complex-coefficient finite impulse response (FIR) filter. The ionospheric dispersion simulation can be achieved by cascading the three subsystems in a complex baseband and converting the frequency to a radio frequency. Simulation results show that the method has the ability to accurately simulate the ionospheric dispersion characteristics without knowing the signal priori information and has a low implementation complexity.
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| 关 键 词： | generalization ionospheric dispersion simulation system decomposition fractional delay filter complex-coefficient FIR filter |
| 收稿时间： | 2014/4/21 0:00:00 |
Generalized ionospheric dispersion simulation method for wideband satellite-ground-link radio systems |
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| ZHOU Yang,ZHENG Zhe and WU Si-Liang.Generalized ionospheric dispersion simulation method for wideband satellite-ground-link radio systems[J].Journal of Beijing Institute of Technology,2015,24(4):513-518. |
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| Authors: | ZHOU Yang ZHENG Zhe and WU Si-Liang |
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| Affiliation: | School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | A generalized ionospheric dispersion simulation method is presented to verify and test wideband satellite-ground-link radio systems for dispersion robustness. In the method, ionospheric dispersive effects on wideband radio waves are modeled as an allpass nonlinear phase system, thus greatly decreasing the need for signal priori information. To accurately simulate the ionospheric dispersion and reduce the implementation complexity, the system is decomposed into three new allpass subsystems: with a linear phase passing through zero frequency, a constant phase, and a nonlinear phase with zero-offset and quasi-parabolic form respectively. The three subsystems are implemented respectively by the combination of integer-interval delay and fractional delay filter, digital shifting phase and the complex-coefficient finite impulse response (FIR) filter. The ionospheric dispersion simulation can be achieved by cascading the three subsystems in a complex baseband and converting the frequency to a radio frequency. Simulation results show that the method has the ability to accurately simulate the ionospheric dispersion characteristics without knowing the signal priori information and has a low implementation complexity. |
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| Keywords: | generalization ionospheric dispersion simulation system decomposition fractional delay filter complex-coefficient FIR filter |
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