NDLI: Fast Doppler shift acquisition method for hypersonic vehicle communications

Content Provider	IET Digital Library
Author	Shi, Lei Zhu, Congying Zhao, Lei Yuan, Shurong Yao, Bo Li, Xiaoping
Abstract	Large and rapidly changing Doppler shift poses a huge challenge on fast carrier acquisition for hypersonic vehicle communications. In this study, a novel Doppler shift acquisition method is proposed to increase the acquisition probability and reduce the acquisition time simultaneously. Firstly, the Doppler rate is estimated with a proposed fast blind estimation algorithm. The order of Doppler shift is reduced though twice instantaneous delay autocorrelation operation on the received signal and the modulated information is cancelled, and the Doppler rate can be obtained by the corresponding spectrum analysis. Secondly, the received signal is compensated by the estimated Doppler rate. Finally, the maximum value of the average power spectrum of the compensated result over multiple symbols is detected, and the Doppler shift and Doppler rate can be jointly determined. Furthermore, to improve the acquisition speed, a corrected narrower range, which is determined by the flight conditions of the hypersonic vehicles, is proposed to constrain the search range of the power spectrum peak. Simulation results indicate that, under typical hypersonic flight conditions, the acquisition probability of the Doppler rate increases from 0.52 to 0.86 under − 20 dB. The processing speed can be improved by 75.47% when the length of the combined symbols is 1000.
Starting Page	474
Ending Page	479
Page Count	6
ISSN	17518628
Volume Number	14
e-ISSN	17518636
Issue Number	Issue 3, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/14/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.6228
Journal	IET Communications
Publisher Date	2019-11-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Acquisition Probability Acquisition Speed Acquisition Time Correlation Method Doppler Radar Doppler Rate Increases Doppler Shift Estimated Doppler Rate Fast Blind Estimation Algorithm Fast Carrier Acquisition Fast Doppler Shift Acquisition Method Hypersonic Vehicle Hypersonic Vehicle Communication Interpolation And Function Approximation Noise Figure 20.0 DB Novel Doppler Shift Acquisition Method Numerical Analysis Optical, Image And Video Signal Processing Probability Radar Equipment Radar Imaging Received Signal Signal Detection Statistics System And Application Twice Instantaneous Delay Autocorrelation Operation Typical Hypersonic Flight Condition
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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