Heinvented the constant envelope 4-code ALT-BOCmodulation.Géraldine Artaud is a navigation engineer in theCNES Transmission Techniques department since2007. He was a member of the GalileoSignal Task Force (GSTF) and contributed to thedefinition of the Galileo signal and provided support tothe 2004 US-EU agreement of navigation system. BIOGRAPHYLaurent Lestarquit is a navigation signal expert at theCNES Transmission Technique and Signal Processingdepartment (TT).
#HADOOP FOR DUMMIES PDF CODE#
The second consists incoherent Alt-BOC processing of the composite signalfor which many method have already been proposed.We will propose a new method for tracking the pilotcodes of the Alt-BOC, a method that is using theproperties of the 2 code Alt-BOC (which has beennoticed in ), and usingsub-carrier trackingtechniques as described in and.
The simplest oneconsists in independent processing of E5a and E5b asBPSK or QPSK signals.
Thereare mainly two different approaches. The PSD of thisexpression is analysed and leads to surprisingconclusions.Next we will focus on some reception architecturesallowing the reception of the Alt-BOC signal. An analyticalexpression quite difficult, but we will show how thisexpression is to be interpreted. This trick wasfurther put into equation by ESA under the form of across product that led to the analytical definition of thesignal as defined in the Galileo ICD. Theproblem was solved by using a “trick” which led to thelook-up table defined by CNES. Then we’ll move to the 4-codes version.Indeed, the combination of four signals is possible butthe resulting signal hasn’t a constant-envelope. The understanding of Alt-BOC is challenging, so wepropose a step by step approach to apprehend it,beginning with a comprehensive insight of the 2 codeAlt-BOC, its characteristics, its properties, the possiblevariants. This intuition was later confirmed bymeasurements performed on the real signalbroadcasted by GIOVE-A. The idea of receivingthe complete Alt-BOC arrived later when theoreticalstudies showed that the process of this wideband signalwould lead to positioning of unprecedented accuracy. Processing thewhole signal rather than the 2 separate E5a and E5bsignals wasn’t envisioned at first. AltBOC for Dummies or Everything YouAlways Wanted to Know About AltBOCLaurent Lestarquit, CNESGéraldine Artaud, CNESJean-Luc Issler, CNEStaking into account the limitations of the onboardOMUX, and giving it a constant-envelope in order tomaximize the amplifier efficiency.
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