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Diurnal Effect Compensation Algorithm for a Backup and Substitute Navigation System of GPS  

Lee, Young-Kyu (한국표준과학연구원 기반표준부 길이시간센터)
Lee, Chang-Bok (한국표준과학연구원 기반표준부 길이시간센터)
Yang, Sung-Hoon (한국표준과학연구원 기반표준부 길이시간센터)
Lee, Jong-Koo (한국표준과학연구원 기반표준부 길이시간센터)
Kong, Hyun-Dong (국토해양부 제주해양관리단)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.12A, 2008 , pp. 1225-1232 More about this Journal
Abstract
In this paper, we describe a compensation method of diurnal effect which is one of the factors giving large effect on the performance when using ground-wave signals like Loran-C for a backup and substitute navigation system of global satellite navigation system such as GPS, and currently many researches of the topics are doing in USA and in Europe. In order to compensate diurnal effect, we find periodic frequency components by using the Least Square Spectral Analysis (LSSA) method at first and then compensate the effect by subtracting the estimated compensation signal, obtained by using the estimated amplitude and phase of the individual frequency component, from the original signal. In this paper, we propose a simple compensation algorithm and analysis the performance through simulations. From the results, it is observed that the amplitude and phase can be estimated with under 5 % and 0.17 % in a somewhat poor receiving situation with 0 dB Signal to Noise Ratio (SNR). Also, we analyze the obtainable performance improvement after compensation by using the measured Loran-C data. From the results, it is observed that we can get about 22 % performance improvement when a moving average with 5 minutes interval is employed.
Keywords
Diurnal effect; Least square spectral analysis; Navigation; Loran-C; Signal compensation;
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