{"id":20785496,"url":"https://github.com/folkertvanheusden/pps-comparer","last_synced_at":"2026-06-19T16:32:28.895Z","repository":{"id":249878073,"uuid":"832832138","full_name":"folkertvanheusden/pps-comparer","owner":"folkertvanheusden","description":"Measures the difference between PPS pulses","archived":false,"fork":false,"pushed_at":"2026-03-29T11:23:44.000Z","size":60,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"master","last_synced_at":"2026-05-18T21:45:56.198Z","etag":null,"topics":["pps","time"],"latest_commit_sha":null,"homepage":"","language":"C++","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/folkertvanheusden.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,"zenodo":null,"notice":null,"maintainers":null,"copyright":null,"agents":null,"dco":null,"cla":null}},"created_at":"2024-07-23T20:06:32.000Z","updated_at":"2026-03-29T11:23:47.000Z","dependencies_parsed_at":null,"dependency_job_id":"73c35635-0d18-4911-b50f-baf0f110e8a4","html_url":"https://github.com/folkertvanheusden/pps-comparer","commit_stats":null,"previous_names":["folkertvanheusden/pps-comparer"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/folkertvanheusden/pps-comparer","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/folkertvanheusden%2Fpps-comparer","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/folkertvanheusden%2Fpps-comparer/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/folkertvanheusden%2Fpps-comparer/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/folkertvanheusden%2Fpps-comparer/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/folkertvanheusden","download_url":"https://codeload.github.com/folkertvanheusden/pps-comparer/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/folkertvanheusden%2Fpps-comparer/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":34539729,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-05-26T15:22:16.424Z","status":"online","status_checked_at":"2026-06-19T02:00:06.005Z","response_time":61,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"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":["pps","time"],"created_at":"2024-11-17T14:45:54.896Z","updated_at":"2026-06-19T16:32:28.872Z","avatar_url":"https://github.com/folkertvanheusden.png","language":"C++","funding_links":[],"categories":[],"sub_categories":[],"readme":"To be able to compile this, you need the pps-tools and cmake packages. libgps-dev is optional.\nTo run:\n    sudo ./pps-comparer -1 /dev/pps0 -2 /dev/pps1 -l log.dat\n\nPress ctrl+c to stop measuring\n\nWhen you've got libgps-dev installed during build, -g \u003chost\u003e adds gpsd stats to the output.\n\nIf you have saved the output to e.g. test.dat (-l test.dat), you can plot the Allan deviation plot with:\n\n    ./plot-allan.py test.dat test.svg\n\ntest.svg is then the output-graph.\n\nFor a histogram or as a time-series, use plot-hist.py and plot-ts.py.\n\nNote: when pulses are missing(! e.g. when GPS loses fix), the comparison goes haywire.\n\nOutput (with GPS - which is optional):\n```\nnr    ts1                  ts2                  difference   missing1/2 difference-drift fix hdop\n10852 1732126554.000050923 1732126554.000046496 4.427000e-06 548/88     2.783154e-10     3   1.760000\n10853 1732126555.000050482 1732126555.000044753 5.729000e-06 548/88     2.206966e-10     3   1.760000\n10854 1732126556.000049989 1732126556.000045875 4.114000e-06 548/88     3.406431e-10     3   1.760000\n...\n```\n\nTwo bad time-sources:\n![allan deviation](images/AD.svg)\n\n\nReleased under the MIT license by Folkert van Heusden.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffolkertvanheusden%2Fpps-comparer","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ffolkertvanheusden%2Fpps-comparer","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffolkertvanheusden%2Fpps-comparer/lists"}