Design and Simulation of ELoran Receiver

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Abbasi, Fatemeh | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45475 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Fotowat Ahmadi, Ali
Abstract:
In recent years, eLoran system has been introduced as backup to global navigation systems like GPS, because of their vulnerability. eLoran is a low frequency (100 kHz) system. Its long wavelength allows indoor positioning.
Main eLoran advantages rather than Loran-C are: better accuracy (near 10m), using 9th pulse positioning modulation (PPM) as loran data channel (LDC) and all-in-view receivers
In this thesis, eLoran pulses are simulated in GRI. Also, a new analoge-digital circuit for faster pulse detection is developed.
Also, it is proved that an oscillator with same frequency and phase as enterance signal, responses faster than a band pass filter and envelope detector. So, a quaderature oscillator within added circuits is used for faster identifying standard zero crossing (SZC) of eLoran pulse. Furthermore, by using signal detection oscillator (DSO) and smart activation of digital part, digital processing power is reduced more than 50%. System and circuits performance are shown in simulations
Keywords:
Active Inductor ; Eloran Receiver ; Loran Data Channel ; Zero Crossing Detection ; Quadrature Oscillator

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