{"id":15116192,"url":"https://github.com/codyd51/gypsum","last_synced_at":"2026-01-22T18:27:36.970Z","repository":{"id":233296872,"uuid":"720761606","full_name":"codyd51/gypsum","owner":"codyd51","description":"GPS receiver from a raw antenna 🛰️","archived":false,"fork":false,"pushed_at":"2024-04-15T17:30:55.000Z","size":2872,"stargazers_count":346,"open_issues_count":3,"forks_count":22,"subscribers_count":10,"default_branch":"release","last_synced_at":"2025-09-27T21:33:01.102Z","etag":null,"topics":["gps-tracker","python3","sdr"],"latest_commit_sha":null,"homepage":"https://axleos.com/building-a-gps-receiver-part-1-hearing-whispers/","language":"Python","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/codyd51.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2023-11-19T14:23:57.000Z","updated_at":"2025-09-23T09:40:10.000Z","dependencies_parsed_at":"2024-04-15T16:58:19.954Z","dependency_job_id":"1eec1c5c-93a4-4c6e-95e3-3ecb442be841","html_url":"https://github.com/codyd51/gypsum","commit_stats":null,"previous_names":["codyd51/gypsum"],"tags_count":1,"template":false,"template_full_name":null,"purl":"pkg:github/codyd51/gypsum","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/codyd51%2Fgypsum","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/codyd51%2Fgypsum/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/codyd51%2Fgypsum/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/codyd51%2Fgypsum/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/codyd51","download_url":"https://codeload.github.com/codyd51/gypsum/tar.gz/refs/heads/release","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/codyd51%2Fgypsum/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":28668013,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-01-22T17:07:18.858Z","status":"ssl_error","status_checked_at":"2026-01-22T17:05:02.040Z","response_time":144,"last_error":"SSL_connect returned=1 errno=0 peeraddr=140.82.121.6:443 state=error: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["gps-tracker","python3","sdr"],"created_at":"2024-09-26T01:44:12.977Z","updated_at":"2026-01-22T18:27:36.949Z","avatar_url":"https://github.com/codyd51.png","language":"Python","funding_links":[],"categories":["Python"],"sub_categories":[],"readme":"\u003cp align=\"center\"\u003e\n  \u003cimg src=\"./readme_images/gypsum_logo_header.png\" width=\"800\"\u003e\n\u003c/p\u003e\n\ngypsum is a homebrew GPS receiver written in Python. gypsum can carry out a position fix in less than 60 seconds of antenna readings from a cold start. \n\ngypsum implements a GPS signal processing stack with no dependencies aside from `numpy`. \n\n\u003cp align=\"center\"\u003e\n  \u003cimg src=\"./readme_images/sat_tracker.png\" width=\"600\"\u003e\n\u003c/p\u003e\n\ngypsum turns any commodity SDR into a GPS receiver. I primarily use an [RTL-SDR](https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/), and have had success with a [HackRF](https://greatscottgadgets.com/hackrf/one/) as well. Either of these can be paired with any patch antenna sensitive to 1.57542GHz.\n\n[This project comes with a 4-part writeup](https://axleos.com/building-a-gps-receiver-part-1-hearing-whispers/) on implementing a GPS receiver from scratch.\n\nhttps://github.com/codyd51/gypsum/assets/4972184/e72151fe-994e-4e5a-95b4-19e5c91d2b20\n\ngypsum ships with a web-based dashboard that allows the user to monitor signal quality, track progress, position fix history, and satellite tracking pipeline state.\n\n## Using gypsum\n\nThe most convenient way to try out gypsum is to use a file containing saved antenna samples. This allows off-the-air development and signal replays.\n\nI've uploaded a sample antenna recording to the [Releases section](https://github.com/codyd51/gypsum/releases) of the repo. Download [this file](https://github.com/codyd51/gypsum/releases/download/1.0/nov_3_time_18_48_st_ives.zip) and place it in `./gypsum/vendored_signals/`. gypsum needs information on what these files contain, so currently their info is hard-coded [here](https://github.com/codyd51/gypsum/blob/release/gypsum/radio_input.py#L101-L111). In the future, we could introduce a bespoke file format that includes the recording parameters and the antenna samples in-band.\n\n```bash\n# Install gypsum's dependencies\n$ pip install -r requirements.txt\n# If you want to use the web-based tracking dashboard\n$ pip install -r requirements-webapp.txt\n\n# Run gypsum against the cached antenna samples\n# (And limit the satellite search scope for speed) \n$ python3 gypsum-cli.py --file_name nov_3_time_18_48_st_ives --only_acquire_satellite_ids 25 28 31 32 --present_web_ui\n\n# (In another shell)\n# Launch the webserver to observe gypsum\n$ gunicorn -b :8080 --timeout 0 web_dashboard:application\n```\n\nThe receiver has various behaviors that can be tweaked by modifying [config.py](https://github.com/codyd51/gypsum/blob/release/gypsum/config.py).\n\n## License\n\nMIT \n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcodyd51%2Fgypsum","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcodyd51%2Fgypsum","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcodyd51%2Fgypsum/lists"}