Unambiguous Sine-Phased BOC (kn,n) Signal Acquisition Based on Combined Correlation Functions
Abstract: Galileo and GPS have
been developing their new signals in recent years. Multiplexed Binary Offset
Carrier (MBOC) is the final implementation of Galileo E1 and GPS L1C, which is
the multiplexing of BOC (1,1) and BOC (6,1). Therefore, it is helpful to
satisfy the demand that the new signals must becompatible with GPS BPSK signal.
BOC (kn,n) modulation will provide better track performance and higher positioning
accuracy. However, the main drawback of the BOC modulated signal is that its
autocorrelation has multiple side peaks around the main peak. This paper will
focus on a family of signals: sine-phased BOC (kn,n). We are trying to explore
a new method to cancel the side peaks of BOC (kn,n) autocorrelation, making use
of two kinds of correlation functions. One is the correlation of the incoming signal
and the sine-phased BOC (kn,n) modulated spreading code(PRN code multiplied by
subcarrier), and the other is the correlation of the incoming signal and the
PRN code only. Two kinds of correlationfunction are separated into several
sub-correlations. Sub-correlations have less side peaks which are in different
code delays. Corresponding parts of two sub-correlations will be combined to
cancel the side peaks separately, and finally the new function without side
peaks will be acquired after several correlations added together. Simulation
results will be given. It is shown that the proposed method is contributed to
the side peaks cancellation for unambiguous sine-phased BOC (kn, n) signal
acquisition.
Author: Deng Zhongliang, Xi
Yue, Yin Lu
Journal Code: jptkomputergg150097
