A New FFT-Based Algorithm for Secondary Code Acquisition for Galileo Signals

Tawk, Youssef; Jovanović, Aleksandar; Leclère, Jérôme; Botteron, Cyril; Farine, Pierre-André

doi:10.1109/vetecf.2011.6093107

Cited by 12 publications

(17 citation statements)

References 1 publication

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“…It can be noted that variation of PLL error is similar for all cases considered, because carrier tracking is performed independently on the pilot channel only, and the frequency lock is well maintained. Only the secondary code was wiped off according to [12].…”

Section: Simulation-based Tracking Resultsmentioning

confidence: 99%

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Two-Step Galileo E1 CBOC Tracking Algorithm: When Reliability and Robustness Are Keys!

Jovanović

Mongrédien

Tawk

et al. 2012

International Journal of Navigation and Observation

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The majority of 3G mobile phones have an integrated GPS chip enabling them to calculate a navigation solution. But to deliver continuous and accurate location information, the satellite tracking process has to be stable and reliable. This is still challenging, for example, in heavy multipath and non-line of sight (NLOS) environments. New families of Galileo and GPS navigation signals, such as Alternate Binary Offset Carrier (AltBOC), Composite Binary Offset Carrier (CBOC), and Time-Multiplex Binary Offset Carrier (TMBOC), will bring potential improvements in the pseudorange calculation, including more signal power, better multipath mitigation capabilities, and overall more robust navigation. However, GNSS signal tracking strategies have to be more advanced in order to profit from the enhanced properties of the new signals.In this paper, a tracking algorithm designed for Galileo E1 CBOC signal that consists of two steps, coarse and fine, with different tracking parameters in each step, is presented and analyzed with respect to tracking accuracy, sensitivity and robustness. The aim of this paper is therefore to provide a full theoretical analysis of the proposed two-step tracking algorithm for Galileo E1 CBOC signals, as well as to confirm the results through simulations as well as using real Galileo satellite data.

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Section: Simulation-based Tracking Resultsmentioning

confidence: 99%

“…It is well described in [11,12]. The search for the primary code phase is performed serially within one primary code length, and the secondary code phase is searched in parallel over the entire length of the secondary code.…”

Section: Galileo E1 Cboc Autocorrelation Functionmentioning

confidence: 99%

Two-Step Galileo E1 CBOC Tracking Algorithm: When Reliability and Robustness Are Keys!

Jovanović

Mongrédien

Tawk

et al. 2012

International Journal of Navigation and Observation

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“…The approaches (Borio, 2011;Corazza et al, 2007) presenting enhanced search in the SC phase have complexity approximately equal to N SC log 2 (N SC ). The same complexity has the approach (Tawk et al, 2011) with a PCS search in the SC phase. The specific type of SC search is out of the scope of this paper.…”

Section: F I G U R E 1 0 Handling Bit Transition By Removal Schema Inmentioning

confidence: 99%

“…The acquisition is, however, complicated by the presence of the SC and by a long primary code period, which is also often used. Cannon, 2006;Tawk, Jovanovic, Leclere, Botteron, & Farine, 2011). It is advantageous in case of weak signal reception, where the increase of non-coherent integration time is not enough.…”

Section: Introductionmentioning

confidence: 99%

Novel partial correlation method algorithm for acquisition of GNSS tiered signals

et al. 2020

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This paper presents a new modified Single Block Zero-Padding (mSBZP) Partial Correlation Method (PCM) Parallel Code Search (PCS) algorithm for effective acquisition of weak GNSS tiered signal using coherent processing of its secondary code (SC) component. Two problems are discussed: acquisition of primary codes with a longer period using FFT blocks of limited length, and the utilization of PCS in the presence of SC bit transition. The PCM and SC bit transition forms parasitic fragments in the Cross-Ambiguity-Function (CAF) to devaluate signal detection performance. A novel analysis of this mechanism and its impact is presented. A novel mSBZP-PCM-PCS algorithm is proposed, which does not degrade the CAF. Then, the algorithm is combined with SC bit transition removal schema and sequential search to construct an estimator for weak tiered signal acquisition. The performance of the method is demonstrated by analysis and computer simulation using Galileo E1C and GPS L1C-P signals.

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“…To get high sensitivity, the coherent integration time should be at least one period of the secondary code, or a multiple of it. In [10], it has been proposed to determine the primary code delay with a serial search and the secondary code delay with a fast Fourier transform (FFT) based correlation, however the serial search is too time-consuming for a realistic implementation. In [11], the authors proposed to perform an FFT-based correlation over one period of the secondary code with the L5 signal, nevertheless this requires very large FFTs (length greater than 2 18 ), which are not compatible with a hardware implementation.…”

Section: Introductionmentioning

confidence: 99%

High sensitivity acquisition of GNSS signals with secondary code on FPGAs

Leclère¹,

Botteron

Farine

2017

IEEE Aerosp. Electron. Syst. Mag.

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Abstract-The presence of a secondary code in modern global navigation satellite system signals complicates the acquisition of these signals, because there is a potential sign transition between each period of the primary code. Some previous works proposed to use the parallel code search by performing the correlation over the primary code several times and then combining the results according to the secondary code chips. In this article, we will focus on this method and compare different hardware implementations, to determine if it is better to do the combinations before or after the correlations, and to compare serial and parallel architectures. In a second part, we will show a simple method that manipulates the local secondary code to rearrange the equations, which approximately halves the theoretical number of operations related to the secondary code correlation and the processing time for hardware implementations, without any impact on the sensitivity.

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A New FFT-Based Algorithm for Secondary Code Acquisition for Galileo Signals

Cited by 12 publications

References 1 publication

Two-Step Galileo E1 CBOC Tracking Algorithm: When Reliability and Robustness Are Keys!

Two-Step Galileo E1 CBOC Tracking Algorithm: When Reliability and Robustness Are Keys!

Novel partial correlation method algorithm for acquisition of GNSS tiered signals

High sensitivity acquisition of GNSS signals with secondary code on FPGAs

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