Time-frequency Analysis of Time-Varying Plasma's Influences on PCM-FM Signal

被引：0
|
作者：
Gu, Xianglong [1 ]
Cao, Rui [1 ]
Wang, Zhenkun [1 ]
Hu, Yaxiong [1 ]
Wang, Junjie [1 ]
Zhou, Xin [1 ]
机构：
[1] Northwest Inst Nucl Technol, Xian, Shaanxi, Peoples R China
来源：
PROCEEDINGS OF 2019 IEEE 3RD INFORMATION TECHNOLOGY, NETWORKING, ELECTRONIC AND AUTOMATION CONTROL CONFERENCE (ITNEC 2019) | 2019年
关键词：
time-varying plasma; time-frequency analysis PCM-FM signal; phase noise;
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In the process of hypersonic flight vehicle reentry, plasma sheath form on the aircraft surface because of atmospheric friction.Due to the changes of vehicle speed, posture and height , the atmospheric turbulence and non-uniform ablation, the influence of such factors makes the formed plasma sheath has time-varying characteristics.Statistical properties of telemetry PCM-FM signal change with the plasma's parameters after the signal propagate through the time-varying plasma,and the PCM-FM signal become non-stationary random signal.In order to study the influence of time-varying plasma to PCM-FM signal, The time-frequency analysis is carried out on the output signal using short-time Fourier transform.Analysis results show that the time-varying plasma's influence on the PCM-FM signal perform as amplitude attenuation and phase stray.Increasing the carrier frequency can reduce the influence of amplitude attenuation and improve the quality of the signal to a certain extent.But phase-stray phenornenonstill exist, and can be solved by other methods such as phase filtering.
引用
收藏
页码：1936 / 1939
页数：4
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