November 2024
Intermediate to advanced
352 pages
10h 52m
English
Content preview from Communication Systems Engineering with GNU Radio
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8QPSK and CCSDS Packets: Meteor-M 2N Satellite Signal Reception
The signals associated with this chapter are available at https://iqengine.org in GNU Radio SigMF Repo 
space 
MeteorM2N_180501_17h52_after_resampler and MeteorM2_180502_14h12, both collected using an RTL-SDR receiver fitted with a dipole antenna at a sampling rate of 156.8 kS/s. Polar-orbiting satellite signals are best received at high latitude, where they become visible once every 100 minutes (Figure 8.1).
8.1 Introduction
Shifting from analog to digital communication is an unquestionable trend (analog television to Digital Video Broadcast-Terrestrial [DVB-T], analog commercial broadcast Frequency Modulation [FM] to Digital Audio Broadcasting [DAB], telephone), and the satellite radio frequency links are no exception, aimed at optimizing the radio frequency spectrum usage and the quality of the transmitted signals. While the analog automatic picture transmission (APT) protocol of the low-Earth polar-orbiting NOAA satellites is doomed to disappear with the end of this satellite constellation, the succession seems to be taken care of with a protocol using the same bandwidth but digital, allowing the transmission of pictures with improved resolution: low rate picture transmission (LRPT). We shall see that this performance ...
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