Title :
Double-chipwise correlation technique for efficient L2C signal acquisition
Author :
Hong Li ; Mingquan Lu
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ. Beijing, Beijing, China
Abstract :
To further expedite L2C signal acquisition, in this article a double-chipwise correlation technique is developed. Inspired by the L2C signal structure that a civil moderate (CM) chip before multiplexing indeed represents the CM chip itself and a multiplexed civil long (CL) chip after multiplexing, the new technique accumulates the samples across the periods of a CM and a CL chip together. Compared with the recently proposed chipwise correlation technique, this new technique further reduces the correlation complexity of testing cells to half and decreases the code phases to test to half, at the expense of about 1.3 dB of detection performance loss on average. In addition, no extra operations are needed to deal with local CM code. Numerical results show that the new technique saves acquisition time significantly; for L2C signal received under clear sky conditions, the saving is about 75%.
Keywords :
correlation methods; multiplexing; signal detection; CL chip; CM chip; L2C signal acquisition; L2C signal structure; acquisition time saving; civil long chip; civil moderate chip; code phases; correlation complexity reduction; detection performance loss; double-chipwise correlation technique; testing cells; Complexity theory; Correlation; Global Positioning System; Optical signal processing; Testing; Time division multiplexing;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
DOI :
10.1109/TAES.2014.130546