Abstract
The autocorrelation function (ACF) of the Binary Offset Carrier modulation (BOC) signal for Global Navigation Satellite System (GNSS) has multiple peaks, ambiguity is easily generated during the synchronization of the baseband signal. Some methods have been proposed to remove the ambiguity, but the performance is not suitable for high-order BOC signals or does not maintain narrow correlation characteristics. This paper proposes a sub-function reconstruction synchronization algorithm to solve this problem, of which the key is to design a new local auxiliary code: the local Pseudo-Random Noise (PRN) code is divided into several new codes with different delays. The auxiliary code performs a coherent integration operation with the received signal. Then, a correlation function without any positive side peaks is obtained by multiplying the two correlation results to make the acquisition/tracking completely unambiguous. The paper gives a design scheme of navigation signal acquisition/tracking and deduces the theoretical analysis of detection performance. The phase discrimination function is provided. The performance of the method is analyzed from both theoretical and simulation aspects. Compared with the Binary phase shift keying-like (BPSK-LIKE) method, Subcarrier Phase Cancellation (SCPC) method and the Autocorrelation Side-Peak Cancellation Technique (ASPeCT) method, the proposed method has the best detection probability for the acquisition, which is 0.5 dB-Hz better than ASPeCT. For tracking, the proposed method performs best in terms of phase-detection curve, anti-multipath performance, and anti-noise performance. For high-order BOC signals, the SRSA technique successfully removes the false lock points, and there is only one multipath error envelope, and the code tracking error is almost the same as the ASPeCT method.
Highlights
Compared to traditional the Global Navigation Satellite System (GNSS), the addition of Binary Offset Carrier modulation (BOC) modulation signals marks a breakthrough in the development of modern GNSS
The Subcarrier Phase Cancellation (SCPC) method performs coherent integration by receiving a signal with a local BOC signal modulated by two orthogonal subcarriers to obtain an unambiguous new function
Sub-function reconstruction synchronization algorithm is proposed in this paper
Summary
Compared to traditional the Global Navigation Satellite System (GNSS), the addition of BOC modulation signals marks a breakthrough in the development of modern GNSS. There are three main types of processing methods for acquisition and tracking the BOC signal: The first type is to avoid the ambiguity detection method These methods, such as the double estimation technique (DET) method [2,3] and the Bump-jump (BJ) method [4], detect the occurrence of error acquisition or mis-locking during the synchronization process of the BOC signal by adding a correlator. The SCPC method performs coherent integration by receiving a signal with a local BOC signal modulated by two orthogonal subcarriers to obtain an unambiguous new function. This method is applicable to BOC(m, n) signals, it does not retain the narrow correlation characteristics of BOC signals.
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