gr-opssat

Original authors: Fischer Benjamin ([email protected]), Tom Mladenov ([email protected])

This repository contains documentation, and applications for receiving, demodulating, and decoding the UHF signal transmitted by the ESA OPS-SAT mission. It also contains a full graphical application for viewing and parsing the beacon frames transmitted by OPS-SAT.

https://opssat1.esoc.esa.int/ https://opssat1.esoc.esa.int/projects/amateur-radio-information-bulletin

https://www.esa.int/Our_Activities/Operations/OPS-SAT

Overview

UHF specifications

Can be found in docs/os-uhf-specs.pdf

Applications

Authors: Guilhem Honore, Maxence Beuselinck, Tim Oerther

The project has been taken over to be wrapped as an AppImage and the dependencies updated. You can find the releases for x86_64 and aarch64. To build it yourself, you can set as executable and run the script build_appimage.sh. The goal of the AppImage is to have a working out-of-the-box project for all amateur radio operator.

Getting started

There are two ways to use the application to send us data. The appimage available for linux in x86_64 and aarch64 architecture is a system designed to work out-of-the-box. The source code is also available in the gnuradio-companion scripts, enabling you to set up other SDRs and run it on other systems. However, this requires more work in terms of installing dependencies.

AppImage

Please download the appropriate AppImage, run the AppImage with

chmod +x opssat_uhf-$ARCH.AppImage #set the AppImage as exectuable
./opssat_uhf-$ARCH.AppImage

Operational usage with live reception

For operational usage, please look at the UHF campain guide - AppImage

GNU Radio companion scripts

Please download the source from the folder ./app-grc_script, you can find it as zipped in the release.

Operational usage with live reception

For operational usage, please look at the UHF campain guide - GRC Scripts

Desktop interface

It receives the RS decoded CSP packet + 4 byte CRC32-C over a ZMQ socket on localhost port 38211 to which it is subscribed. You should now see beacon frames being parsed and displayed:

The raw packet history shows the received packets, CRC check status and CSP header information.

This application writes to 3 logfiles in a temporary folder located in /tmp/ or your linux machine:

• One log contains the raw received hex data (raw.log)
• The second log contains the parsed beacon telemetry (parsed_beacon.log)
• The third log contains timestamped events generated by the application (gui_event.log)