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Journal of Electrical and Computer Engineering
Volume 2017, Article ID 5381789, 9 pages
https://doi.org/10.1155/2017/5381789
Research Article

SSCM: An Unambiguous Acquisition Algorithm for CBOC Modulated Signal

Communication and Network Institute, Shenyang Ligong University, Shenyang 110159, China

Correspondence should be addressed to Yongxin Feng; ten.362@nixgnoygnef

Received 10 May 2017; Revised 19 August 2017; Accepted 30 August 2017; Published 21 December 2017

Academic Editor: Tho Le-Ngoc

Copyright © 2017 Yongxin Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Composite binary offset carrier (CBOC) signal has been widely researched in GNSS. The main ingredient of CBOC signal is BOC signal. Usually, the acquisition method for BOC signal is used to capture CBOC signal, while the research of special acquisition method for CBOC signal is rare. In this letter, according to the principle and characteristics of CBOC signal, a special side-peak cancellation method (SSCM) is proposed and simulated. In this method, two special auxiliary signals are introduced. And the local reference signals are obtained by multiplying the data channel signal and pilot channel signal by the auxiliary signals. The cross-correlation results from the received pilot signal and the two local pilot signals with different auxiliary signals will subtract from one another. Then, side peaks of correlation function and in-band noise of pilot channel are suppressed, while the data channel has the same operation results. At last the outputs of pilot channel and data channel will be added up to make full use of the received signal power. By this way, the acquisition efficiency, accuracy, and adaptability to low signal-to-noise ratio (SNR) conditions for CBOC signal have been improved, alongside possible solution when the GNSS receiver works in a critical environment.