Study on MSK Modulation for S-band
With the development of global navigation satellite system (GNSS), the number of signals transmitted in L-band has been increasing. Exploiting new frequency bands for radio navigation satellite service (RNSS) is quite necessary. S-band has received widely
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Study on MSK Modulation for S-band Fengjiao Wang, Dazhi Zeng and Rui Li
Abstract With the development of global navigation satellite system (GNSS), the number of signals transmitted in L-band has been increasing. Exploiting new frequency bands for radio navigation satellite service (RNSS) is quite necessary. S-band has received widely attention since the performance of positioning and timing will be benefited significantly by joint positioning of S-band and L-band. The minimum shift keying—binary offset carrier (MSK-BOC) modulation was proposed to be used for Beidou-2 S-band here. The compatibility between Beidou-2 and Beidou-1/Globalstar system was firstly evaluated, and then signal’s code tracking error and multipath error envelope were analyzed. Results indicate that the performance in terms of compatibility and tracking precision of MSK-BOC modulation in S-band is good. The research will provide an instructive reference for the signal design and engineering implementation of Beidou-2. Keywords S-band tracking precision
MSK modulation
Compatibility
Interference
Code
6.1 Introduction Satellite navigation system is a country’s important information infrastructure and strategic facilities, which plays an important part in the fields of military, economic and social life. With the construction and development of global navigation satellite system (GNSS), the number of signals transmitted in L-band has been increasing significantly. At the same time, by joint positioning of different bands, the performance of GNSS can be improved, so it is quite necessary to exploit new F. Wang D. Zeng (&) R. Li School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China e-mail: [email protected]
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2013 Proceedings, Lecture Notes in Electrical Engineering 244, DOI: 10.1007/978-3-642-37404-3_6, Springer-Verlag Berlin Heidelberg 2013
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bands used for radio navigation satellite service (RNSS). China is vigorously developing its independent Beidou-2 satellite navigation system. The status quo is that signals in L-band have been identified preliminarily while for new navigation bands, the signal design work has just begun. Compared with other bands, S-band (2483.5–2500 MHz) can be utilized to combine mobile communication with navigation positioning service by a universal antenna to reduce the terminal’s hardware complexity [1]. The receiver’s ionosphere correction ability and the precision of timing and positioning can be improved by Meta-GNSS of L-band and S-band. The precision and robustness of precise point positioning can also be improved, because the joint positioning of S-band and L-band is conductive to solve the integer ambiguity. Therefore, using S-band for satellite radio navigation has drawn attention of a growing number of countries and regions. S-band has already been used for the downlink of China’s Beidou-1 navigation system. The areal satellite positioning and short message comm
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