Implementation of Phase Demodulation Algorithms on STM32H7 Platform

U ovom radu prikazani su različiti pristupi demodulaciji frekvencijski moduliranih signala. Nekoliko odabranih pristupa je detaljnije obrađeno i analizirano u MATLAB simulacijama. Opisan je optički modulator kao senzor položaja svjetlosnog izvora u dvije dimenzije i kao izvor FM signala. Razmatrani su modulacijski postupci kontinuiranog signala općenito, s naglaskom na kutne modulacije. Dani su parametri signala s izlaza modulatora - nosioc, maksimalna devijacija frekvencije, spektar. Odabrani algoritmi demodulacije su implementirani na STM32H7 sustavu u C programskom jeziku. Analizirane su posebnosti arhitekture tog mikrokontrolerskog sustava zajedno s procesorskim jezgrama na kojima je temeljen. Prikazani su alati i biblioteke za razvoj programske podrške za ovaj sustav. Detaljno su opisane razvijene implementacije demodulacijskih postupaka na STM32H7 platformi i analizirana je njihova točnost i vremenska izvedivost. Razvijena je aplikacija za testiranje i prikaz rezultata s grafičkim korisničkim sučeljem u MATLAB programskom alatu. Predložene su daljnja poboljšanja i proširenja.In this paper different approaches to demodulation of frequency modulated signals were presented. Several approaches were elaborated and analyzed in MATLAB simulations. An optical modulator as a two-dimensional light source position sensor and FM signal source was described. The modulation procedures of the continuous signal were considered, with an emphasis on angular modulations. The parameters of the signal from the modulator output were elaborated - carrier, maximum frequency deviation, spectrum. The selected demodulation algorithms were implemented on the STM32H7 system in the C programming language. The particularities of the microcontroller architecture and processor core were analyzed. The tools and libraries for software development for this system were presented. The implementations of demodulation methods on the STM32H7 platform were described in detail and their accuracy and runtime requirements were analyzed. An application for testing and results visualization with graphical user interface in the MATLAB was developed. Further improvements and extensions have been proposed