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| A New Loran C Sky-Wave and Ground-Wave Identification Algorithm Based on IFFT Spectral Division |
| Zhu Yin-bing①②; Xu Jiang-ning①; Wang Hong-xing②; Cao Ke-jing①; Hu Dong-liang① |
| ①Department of Navigation Engineering, Naval University of Engineering, Wuhan 430033, China; ②Department of Electronic Engineering, NAEI, Yantai 264001, China |
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Abstract For present analog Loran C receiver, it is very complicated and takes a long time to complete cycle identification. Moreover, estimate error when arriving time of sky-wave and ground-wave is less than 50 under algorithms presented by some relative documents is intolerant. For estimating the arriving time of sky-wave and ground-wave exactly, a new algorithm for the detection is presented based on IFFT(Inverse Fast Fourier Transform) spectral division. After proving its feasibility, veracity of arriving time for sky-wave and ground-wave is simulated. The results show that using the new algorithm, veracity of arriving time for sky-wave and ground-wave can get up to 99.6% and no less than 98.6% respectively，and signal to noise ratio (SNR) can be improved 6dB relative to the standard of USCG.
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Received: 17 April 2008
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2009, Vol. 31 
