Demodulation Method for Loran-C at Low SNR Based on Envelope Correlation-Phase Detection

doi:10.3390/s20164535

	Demodulation Method for Loran-C at Low SNR Based on Envelope Correlation-Phase Detection
	Yuan, Jiangbin 1,2,3; Yan, Wenhe 1,2,3; Li, Shifeng 1,2,3; Hua, Yu 1,2,3
刊名	SENSORS
	2020-08-01
卷号	20 期号:16 页码:13
关键词	Loran-C data demodulation envelope correlation skywave interference
DOI	10.3390/s20164535
英文摘要	Loran-C is the most important backup and supplement system for the global navigation satellite system (GNSS). However, existing Loran-C demodulation methods are easily affected by noise and skywave interference (SWI). Therefore, this article proposes a demodulation method based on Loran-C pulse envelope correlation-phase detection (EC-PD), in which EC has two implementation schemes, namely moving average-cross correlation and matched correlation, to reduce the effects of noise and SWI. The mathematical models of the EC, calculation of the signal-to-noise ratio (SNR) gain, and selection of the EC schemes are given. The simulation results show that compared with an existing method, the proposed method has clear advantages: (1) The demodulation SNR threshold under Gaussian channel is only -2 dB, a reduction of 12.5 dB; (2) The probability of the demodulated SNR threshold, being less than zero under the SWI environment, can reach 0.78, a 26-fold increase. The test results show that the average data availability of the proposed method is 3.3 times higher than that of the existing method. Thus, our demodulation method has higher engineering application value. This will improve the performance of the modern Loran-C system, making it a more reliable backup for the GNSS.
资助项目	National Natural Science Foundation of China[11803040] ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology"[Y917SC1]
WOS关键词	SKYWAVE DELAY ESTIMATION ; DATA MODULATION
WOS研究方向	Chemistry ; Engineering ; Instruments & Instrumentation
语种	英语
出版者	MDPI
WOS记录号	WOS:000568597800001
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology" ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology" ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology" ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology" ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology" ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology" ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology" ; CAS "Youth Innovative Talent Project"-"Research on GNSS/Loran-C fusion technology"
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/12036]
专题	中国科学院国家授时中心
通讯作者	Yuan, Jiangbin
作者单位	1.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Precise Positioning & Timing Technol, Xian 71060, Peoples R China
推荐引用方式 GB/T 7714	Yuan, Jiangbin,Yan, Wenhe,Li, Shifeng,et al. Demodulation Method for Loran-C at Low SNR Based on Envelope Correlation-Phase Detection[J]. SENSORS,2020,20(16):13.
APA	Yuan, Jiangbin,Yan, Wenhe,Li, Shifeng,&Hua, Yu.(2020).Demodulation Method for Loran-C at Low SNR Based on Envelope Correlation-Phase Detection.SENSORS,20(16),13.
MLA	Yuan, Jiangbin,et al."Demodulation Method for Loran-C at Low SNR Based on Envelope Correlation-Phase Detection".SENSORS 20.16(2020):13.