###### tags: `GSoC` `GSoC-2021` `Libre-Space` # Improving SatNOGS TX capabilities ## The final report for the GSoC 2021 program ![GSoC logo](https://i.imgur.com/hiKxzr8.png) --- ![Libre Space Foundation logo](https://i.imgur.com/vAnPPQH.png) --- ## Project Summary The purpose of this project was to improve the capabilities of the [SatNOGS](https://satnogs.org/) transmitter (TX). More specifically, SatNOGS is an Open Source global network of satellite ground-stations and is a project of the [Libre Space Foundation](https://libre.space/). SatNOGS consists of subgroups and projects (see [librespacefoundation/satnogs](https://gitlab.com/librespacefoundation/satnogs) on GitLab) so that its management is more efficient and the needs of users are more easily met. My contribution, under the GSoC 2021 program, was made to the out-of-tree module of GNU Radio [gr-satnogs](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs) which is the implementation of SatNOGS within GNU Radio. During the 10 weeks of the GSoC 2021 program, I was able to complete the initial plan for the project. The following is what was implemented: - Implementation of the NanoCom AX.100 Mode 5 encoder - Implementation of the NanoCom AX.100 Mode 6 encoder - Implementation of the Reed-Muller RM (1, 6) encoder and decoder - Modify gr-satnogs libfec so that there is support for convolutional coding - Adding utilities for better processing of sequences by bits (packed_to_unpacked and unpacked_to_packed utilities) - Implementation of convolutional encoder and decoder - Implementation of the Unified SPUTNIX protocol (USP) encoder The following tasks are work in progress: - Implementation of the Unified SPUTNIX protocol (USP) decoder (more in the draft merge request [WIP: Implement Unified SPUTNIX protocol (USP) decoder (!291)](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/merge_requests/291)) Note that according to the [proposal](https://storage.googleapis.com/summerofcode-prod.appspot.com/gsoc/core_project/doc/4534413179748352_1618265510_SatNOGS_TX_capabilities_-_GSoC21_proposal.pdf?Expires=1629366638&GoogleAccessId=summerofcode-prod%40appspot.gserviceaccount.com&Signature=PfQiMNSBuoqPtDmRLM7N9UNugo8vDbmPa%2FMJPeae4Ojwi7M0KBw%2FWm5v35Qe2fWYCI8L0JkBQDyV6r7lg3VeKPCQnuLq5o%2Br8BjwSjXNWBkHuZrFD41ZzF6hm9EPQEaZ%2FRkl7RN3DcZ97YmKd0vHJt5%2BnMmIcCzWbA6vDOOu95eIWf8bRT1jBz8cik1YHrfuqnpU%2BOiHfVKKuOrFnYzFyN0X1KHff%2FCkdu3XluqMzimpgMb5VRVIeeH%2FUgSXuRk46sqlKjcwSRFgoiRq18s%2Btx%2Fkn6A0sOUlNYG7jMxwJ7zTva7X5Ufy%2FwDMjkbcxgpeMoPT1wBrt39G%2FsSexTZSwA%3D%3D), the purpose was to implement the NanoCom AX.100 Mode 5 and Mode 6 encoders and on top of that, I implement thw USP encoder and decoder. This goal was achieved successfully without any problems. ## List of Commits - [Commit c13b3080](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/commit/c13b3080718e9afcd7368b4623b064295f28a088) Mode 5 Encoder for the AX100 modem of GomSpace. - [Commit 04831c25](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/commit/04831c255bd5ad2a2ea457e323a965229ce5b4eb) Mode 6 Encoder for the AX100 modem of GomSpace. - [Commit cbb5c3d3](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/commit/cbb5c3d3631224624191f004af8b5d26e473c605) Reed-Muller RM(1, 6) code - [Commit 3fbb5320](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/commit/3fbb532061b25b003abc6a75376d5cf001d9f5c7) Change of libfec based on the changes that exist in gr-ccsds - [Commit 2981f0c5](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/commit/2981f0c59affb0277c0aa7a364cc5817f0071400) Implement packed_to_unpacked and unpacked_to_packed utilities. - [Commit 5032e85e](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/commit/5032e85eee43c5c42c1b9c03ba98ed576aafb7a1) Add convolutional encoder and decoder - [Commit 2aadc48e](https://gitlab.com/librespacefoundation/satnogs/gr-satnogs/-/commit/2aadc48e409b835acbcf321fd07c096a99ef0a4f) Unified SPUTNIX protocol (USP) encoder It is worth noting that in each task that was completed, all the commits were squashed into one so that there is consistency in the different versions of the final project. ## Others - [A journey into the world of Open Source Projects](https://hackmd.io/@mraptakis/SJiQ3JG6O)
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My experience so far in GSoC 2021... Introduction To begin with, it is worth mentioning that this article is my personal experience of participating in Google Summer of Code (GSoC) and as a member of an Open Source project. As a computer science student, I have little experience with real-world projects. My work so far was part of an exercise and the result was judged only by the final grade. So, wanting to go beyond the student stage and become a real developer, I made the instant decision to participate in the GSoC event. This decision is one of the most beautiful decisions I have made so far... And the journey is not over yet! Let me mention, then, the basics for both the GSoC event and the organization in which I participate, the Libre Space Fundation. About Google Summer of Code (GSoC) The Google Summer of Code (GSoC) event aims to introduce participating students to the world of Open Source software development. It is a program lasting 10 weeks, which for 2021, is active for students from March 29 to August 31. During this period, the student is a member of an open source organization and his purpose is to participate in one of his projects. The student, in addition to writing code, becomes an active member of the organization and gains the best possible experience through this event. About Libre Space Foundation

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