Akademik Veri Yönetim Sistemi
ICAT 2022, İstanbul, Türkiye, 25 - 27 Kasım 2022, ss.268-271
Unmanned Aerial Vehicles
have been used in some different areas such as agriculture, traffic control,
disaster monitoring, and border surveillance for useful information
transmission between two devices recently. These devices use some easily
changeable SDR (Software Defined Radio) systems for real-time video
transmission. Since SDR systems let the users define some software functions
for traditional dedicated hardwares, they do not have to spend more than enough
time, effort and money. SDR systems are implemented by some signal processing
blocks of GNU Radio software. It is free and open source. It uses a low cost
external RF hardware named HackRF One to realize some real-world communications
systems. This hardware transmits and receives the radio signals in a frequency
range. Since this frequency range is not enough for high data rate video
transmission operations, video compression on obtained raw real-time video is
applied by Gstreamer. Gstreamer is a media processing framework having some
open source media processing libraries. Because a good modulation is another
solution for high data rate video transmission in a narrow band system,
obtained digital video data is GMSK (Gaussian Minimum Shift Keying) modulated
by GNU Radio software. This study
provides the users transmitter and receiver side GNU Radio flow graphs, and
shows how the transmission parameters are selected for a good wireless video
transmission.