Galileo civil signal modulations

Rebeyrol, Emilie; Julien, Olivier; Macabiau, Christophe; Ries, Lionel; Delatour, Antoine; Lestarquit, Laurent

doi:10.1007/s10291-006-0047-3

Cited by 40 publications

(28 citation statements)

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“…A chip is defined here as the basic element of the pseudorandom sequence, c(·) which assumes a constant value over the chip duration. For example, a period of the sine BOC is defined as [3,4] …”

Section: Double Phase Estimatormentioning

confidence: 99%

“…To improve the radio-frequency (RF) compatibility among different GNSS signals, new modulations have been introduced [3,4]. In particular, the binary offset carrier (BOC) modulation [3] allows the signal power to be moved away from its centre frequency reducing the frequency overlap with the legacy GPS signals which use a binary phase shift keying (BPSK) modulation.…”

Section: Introductionmentioning

confidence: 99%

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Double phase estimator: new unambiguous binary offset carrier tracking algorithm

Borio

2014

IET Radar, Sonar & Navigation

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Several new global navigation satellite system modulations adopt a binary offset carrier (BOC) subcarrier to shape the signal spectrum, increase the frequency separation and improve the tracking performance. BOC modulated signals are, however, characterised by ambiguous multi-peaked correlation functions and several techniques have been proposed in the literature to solve the problem of locking into secondary peaks. In this study, a novel unambiguous BOC tracking technique, the double phase estimator (DPE), is designed to account for the effect of signal bandlimiting. The DPE is an effective alternative to the double estimator (DE) tracking technique where the subcarrier lock loop is replaced by a subcarrier phase lock loop. In the presence of signal bandlimiting, the DPE is able to generate local signal replicas matched in a better manner to the input components, outperforming the DE. The performance of the DPE is thoroughly characterised and the processing of real wideband BOC signals is used to demonstrate the effectiveness of the algorithm proposed. In addition to this, the DPE requires a lower computational load than the DE and thus should be adopted for the processing of wideband BOC signals.

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Section: Double Phase Estimatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Double phase estimator: new unambiguous binary offset carrier tracking algorithm

Borio

2014

IET Radar, Sonar & Navigation

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“…Currently, researchers are continuing to investigate GPS signal and GALILEO signal design [9]. New signal structure study is also a hot spot in the field of navigation, including the MBOC signal [10], AltBOC signal [11], BCS signal [12], CBCS signal [13] and so on. But the achievements of research are concentrated on the signal acquisition performance, the signal tracking performance, the anti-interference ability and the reliability.…”

Section: Introductionmentioning

confidence: 99%

Navigation signal structure based on complex carrier modulation

Yuan

2011

Sci. China Phys. Mech. Astron.

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Signal structure design is an important part of satellite navigation system research, which directly affects navigation performance. Signal performance parameters are analyzed and performances of BPSK modulated signals and BOC modulated signals are compared. Aiming at requirements of high navigation precision and high anti-jamming ability, a new navigation signal structure based on complex carrier modulation is proposed and performances of the signal are researched with different parameters. A synchronization algorithm is put forward according to the signal characteristics, and the synchronization performance is qualitatively analyzed. Next, the applications of the complex carrier modulated signal are discussed, which include anti-jamming, navigation enhancement, power combing and so on. Simulations and analysis show that the proposed navigation signal structure based on complex carrier modulation has good navigation capabilities and anti-jamming abilities, which deserves further study. complex carrier modulation, BPSK, BOC, root mean square bandwidth PACS: 07.50.Qx1

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“…Galileo E1 OS 신호의 변조 기법 및 Assisted-Galileo 수신기의 손실 요소 분석 1. Galileo E1 OS 신호의 변조 기법 Galileo E1 대역에는 PRS (Public Regulated Service)인 E1-A 채널이 quadrature-phase로, OS 신호가 in-phase로 전송된다 [7].…”

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“…한편 E1 OS 신호의 중심주파수는 1575.42MHz로 GPS L1 대역과 일치하며, GPS와 Galileo 시스템 간 간섭을 줄이기 위하여 BOC (Binary Offset Carrier) 변조 기법에 대하여 연구가 진행되었다. BOC를 단독으로 사용하는 것보다 두 개의 BOC 의 선형 결합인 CBOC (Composite BOC)으로 신호를 변조했을 때 GPS L1 C/A와 Galileo E1 OS 신호의 더 높은 스펙트럼 간 분리를 달성할 수 있다 [7]. Galileo ICD (Interface Control Document)에 주어진 E1 OS 신호는 다음과 같다 [9].…”

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Performance Analysis of Assisted-Galileo Signal Acquisition Under Weak Signal Environment

Lim¹,

Park²,

Sung³

2013

Journal of Institute of Control, Robotics and Systems

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EU's Galileo project is a market-based GNSS (Global Navigation Satellite System) that is under development. It is expected that Galileo will provide the positioning services based on new technologies in 2020s. Because Galileo E1 signal for OS (Open Service) shares the same center frequency with GPS L1 C/A signal, CBOC (Composite Binary Offset Carrier) modulation scheme is used in the E1 signal to guarantee interoperability between two systems. With E1 signal consisting of a data channel and a pilot channel at the same frequency band, there exist several options in designing signal acquisition for Assisted-Galileo receivers. Furthermore, compared to SNR worksheet of Assisted-GPS, some factors should be examined in Assisted-Galileo due to different correlation profile and code length of E1 signal. This paper presents SNR worksheets of Galileo E1 signals in E1-B and E1-C channel. Three implementation losses that are quite different from GPS are mainly analyzed in establishing SNR worksheets. In the worksheet, hybrid long integration of 1.5s is considered to acquire weak signal less than -150dBm. Simulation results show that the final SNR of E1-B signal with -150dBm is 19.4dB and that of E1-C signal is 25.2dB. Comparison of relative computation shows that E1-B channel is more profitable to acquire the strongest signal in weak signal environment. With information from the first satellite signal acquisition, fast acquisition of the weak signal around -155dBm can be performed with E1-C signal in the subsequent satellites.

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Galileo civil signal modulations

Abstract: Spectrum limitations for navigation systems

Cited by 40 publications

References 1 publication

Double phase estimator: new unambiguous binary offset carrier tracking algorithm

Double phase estimator: new unambiguous binary offset carrier tracking algorithm

Navigation signal structure based on complex carrier modulation

Performance Analysis of Assisted-Galileo Signal Acquisition Under Weak Signal Environment

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