Galileo L1c - Acquisition Complexity: Cross Correlation Benefits, Sensitivity Discussions on the Choice of Pure Pilot, Secondary Code, or Something Different

As part of the GPS modernization, the GPS L1 C/A signal will be augmented by the L1C signal. With this improvement, for the first time, several signals from the same constellation will be available at the same frequency. In this paper, an acquisition method is implemented to combine the GPS L1 C/A and L1C signals before correlation. The combined acquisition succeeds to acquire the signal at low C/N 0 , whereas the acquisition of the L1C data channel alone fails. Concerning the tracking, a method to combine the GPS L1 C/A and L1C signals before the discriminator is developed. This method shows better performance than the traditional tracking using only one signal. Finally, a Kalman filter to combine the signals in the tracking is developed. It shows better performance than the traditional tracking in all conditions. Since the L1C signal will not be broadcast before 2013, these methods are tested using a software signal simulator.

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“…Note that a similar method can be applied to Galileo L1-B and L1-C channels as shown in Mattos [15]. First, the method is explained in detail.…”

Section: Combined Acquisition Methodsmentioning

confidence: 99%

Combined Acquisition and Tracking Methods for GPS L1 C/A and L1C Signals

Macchi-Gernot

Petovello

2010

International Journal of Navigation and Observation

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“…Then, the maximum of the two correlations is adopted as decision variable. This strategy can be seen as an extension of the (b-c) technique proposed by [9,10] in which only the correlation with the difference between data and pilot codes was considered. This second strategy implements the Maximum Likelihood estimator for the code delay, the Doppler frequency, and the relative phase between data and pilot channels, and, to the best of our knowledge, has never been applied to the E1 OS signals.…”

Section: Introductionmentioning

confidence: 99%

Data and Pilot Combining for Composite GNSS Signal Acquisition

Borio

Presti

2008

International Journal of Navigation and Observation

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Recommended by Olivier JulienWith the advent of new global navigation satellite systems (GNSS), such as the European Galileo, the Chinese Compass and the modernized GPS, the presence of new modulations allows the use of special techniques specifically tailored to acquire and track the new signals. Of particular interest are the new composite GNSS signals that will consist of two different components, the data and pilot channels. Two strategies for the joint acquisition of the data and pilot components are compared. The first technique, noncoherent combining, is from the literature and it is used as a comparison term, whereas the analysis of the second one, coherent combining with sign recovery, represents the innovative contribution of this paper. Although the analysis is developed with respect to the Galileo E1 Open Service (OS) modulation, the obtained results are general and can be applied to other GNSS signals.

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Galileo L1c - Acquisition Complexity: Cross Correlation Benefits, Sensitivity Discussions on the Choice of Pure Pilot, Secondary Code, or Something Different

Cited by 2 publications

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Combined Acquisition and Tracking Methods for GPS L1 C/A and L1C Signals

Combined Acquisition and Tracking Methods for GPS L1 C/A and L1C Signals

Data and Pilot Combining for Composite GNSS Signal Acquisition

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