相位噪声对卫星通信测量系统性能的影响分析

IF 2.2 3区 综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES Symmetry-Basel Pub Date : 2023-11-12 DOI:10.3390/sym15112053
Xuan Liu, Hongmin Lu, Yifeng He, Fulin Wu, Chengxi Zhang, Xiaoliang Wang
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引用次数: 0

摘要

振荡器是卫星通信测控系统的关键部件,作为时间频率参考精确地执行对称性。同时,相位噪声指数与整个系统的整体性能有着密切的耦合关系,同时在工作过程中不断破坏振荡器的对称性。研究和合理分配相位噪声指标具有十分重要的意义。根据相位噪声的理论公式,分析了频域的幂律谱模型和时域的噪声抖动特性。在测量系统中引入载波跟踪环,建立了相位噪声的频域传递模型,并给出了典型的分析结果。提出了一种离散分数阶积分算法,在给定的幂律谱模型系数下生成相位噪声时域序列。与以往的数值计算方法相比,该算法更符合实际,与仪器测量结果相比,具有足够的精度。经频域转换后,仿真噪声序列在频域内与实测单边带功率谱密度的均方根偏差小于2.5 dB,说明相位噪声序列能更完整地反映频域特性。构建了通信测量仿真系统,提供了频域与时域相结合的离散序列仿真分析方法,综合了相位噪声、热噪声、通信数据率、调制方式、误码率等关键指标的耦合关系。结果表明,当相位噪声引起的相位抖动RMS小于5度时,QPSK/BPSK通信系统的误码率不会明显降低,因此5度可以作为分解载波SSB相位噪声指标的参考。仿真结果已成功应用于卫星间链路系统,具有普遍的实际应用价值。
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Analysis on the Effect of Phase Noise on the Performance of Satellite Communication and Measurement System
An oscillator is a key component of a satellite communication measurement and control system, performing symmetry precisely as a time frequency reference. At the same time, the phase noise index has a close coupling relationship with the overall performance of the entire system, while persistently breaking the symmetry property of the oscillator during work. It is very important to study and reasonably allocate the phase noise index. According to the theoretical formula of phase noise, this paper analyzes the power law spectral model in the frequency domain and the noise jitter characteristics in the time domain. Using the carrier tracking loop in the measurement system, the frequency domain transfer model of phase noise is established, and typical analysis results are given. A discrete fractional integration algorithm is proposed, which can generate the phase noise time domain sequence under the given power law spectral model coefficients. The proposed algorithm is more realistic compared with the previous numerical calculation method, and has sufficient accuracy compared with the results of the instrument. After frequency domain conversion, the RMS deviation between the simulated noise sequence in the frequency domain and the measured single sideband power spectral density is less than 2.5 dB, indicating that the phase noise sequence can reflect the frequency domain characteristics more completely. A communication measurement simulation system is built, and a discrete sequence simulation analysis method combining frequency domain and time domain is provided, and the coupling relationship of key indicators such as phase noise, thermal noise, communication data rate, modulation method and bit error rate is synthesized. The results show that the BER of the QPSK/BPSK communication system will not be significantly reduced if the phase jitter RMS caused by the phase noise is less than 5 degrees, so 5 degrees can be used as a reference for the decomposition of the carrier SSB phase noise index. The simulation results have been successfully applied to a satellite inter-satellite link system, which has universal practical application value.
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来源期刊
Symmetry-Basel
Symmetry-Basel MULTIDISCIPLINARY SCIENCES-
CiteScore
5.40
自引率
11.10%
发文量
2276
审稿时长
14.88 days
期刊介绍: Symmetry (ISSN 2073-8994), an international and interdisciplinary scientific journal, publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided, so that results can be reproduced.
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