Sprejem signala brezžične vremenske postaje z uporabo RTL-SDR

SLAK, UROŠ (author), Burnik, Urban (mentor)

Diplomsko delo obravnava postopek sprejema signala zunanjega senzorja brezžične vremenske postaje z uporabo sistema RTL-SDR. Po kratkem opisu tehnologije programsko določenega radia (SDR) sledi predstavitev sistema RTL-SDR, ki je v splošnem SDR zasnovan na uporabi cenovno dostopnega televizijskega sprejemnika USB z vgrajenim vezjem RTL2832U. Sledi opis zgradbe in princip delovanja sistema RTL-SDR. V nadaljevanju je predstavljeno delovanje brezžične vremenske postaje, ki za prenos RF signala uporablja binarno modulacijo BASK s kodiranjem Manchester pri nosilni frekvenci 433 MHz. Podrobneje so opisani tudi visokofrekvenčni protokoli za prenos signala z zunanjega senzorja. Za delo s sistemom RTL-SDR je na kratko predstavljeno še programsko orodje, izmed katerih so v praktičnem poizkusu izbrani rtl_sdr in Gqrx, ter postopki, ki so potrebni za namestitev paketov in knjižnic, ki so bili uporabljeni pri izgradnji programske opreme. Za analizo signala je bilo uporabljeno programsko orodje Audacity. Na koncu je predstavljen še postopek dekodiranja signala, ki ga oddaja senzor vremenske postaje. Dobljeni rezultati so primerjani s sprejemom s pomočjo programskega paketa rtl_433.

• Language: Slovenian
• Keywords: RTL-SDR, DVB-T TV USB-sprejemnik, brezžična vremenska postaja Oregon Scientific, visokofrekvenčni protokoli, modulacija BASK, Gqrx, Audacity, dekodiranje.
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-81540
• Publication date in RUL: 12.04.2016

Secondary language

• Language: English
• Title: Wireless weather station signal reception using RTL-SDR system

Abstract

This thesis deals with the process of receiving a signal from an external sensor of wireless weather station using RTL-SDR system. After a brief description of software defined radio (SDR) technology it is firstly presented the RTL-SDR system which is in generally SDR based on the use of affordable TV USB tuner with RTL2832U chipset. There follows a description of the structure and principle of operation of the RTL-SDR system. In the following is presented a performance of the wireless weather station which for the transmission of RF signal use a binary modulation BASK with Manchester coding on a carrier frequency of 433 MHz. In more detail there are also described the high frequency protocols for the signal transmission from the external sensor. For working with RTL-SDR system there are briefly presented software tools among which I chose rtl_sdr and Gqrx, and proceedings that are required for the installation of the packets and libraries which I used when building the software. For the analysis of the signal I used a software tool Audacity. In the end it is presented a procedure to decode a signal which is transmitted by the weather station sensor. I compared the result obtained with the reception by using the rtl_433 software package.

• Keywords: RTL-SDR, DVB-T TV USB tuner, Oregon Scientific wireless weather station, high frequency protocols, BASK modulation, Gqrx, Audacity, decoding.