TDDM (time division data modulation) technique will be used in the next generation GNSS (global navigation satellite system)\nto improve processing performance and to reduce inter-GNSS interference; however, the emergence of TDDM signal causes the\nestimation frequency and message reversal fuzz problems in the acquisition process of a GNSS receiver. At present, the traditional\nacquisition methods have some limitations and shortcomings. Therefore, aiming at the unique characteristics of TDDM signal, a\nfast acquisition algorithm is proposed to overcome these fuzz problems in this paper. In the proposed algorithm, three stages are\nobtained by some key technologies, which are the I-Q frequency compensation, superposition processing, subsection processing,\nand reversion position estimation. Besides, the algorithm is simulated from carrier frequency error, code phase error, message\ninversion error, and processing speed. Theoretical and simulation results show that the new algorithm can quickly overcome the\nfuzz problems, and the new algorithm is better than the existing algorithm in the speed and accuracy, which demonstrates that this\nnew algorithm is an effective search scheme for the next generation GNSS signals.
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