# gnss-sdr/gnss-sdr

GNSS-SDR, an open-source software-defined GNSS receiver

Repository: https://github.com/gnss-sdr/gnss-sdr
Canonical: https://ross.abutalabs.com/products/gnss-sdr
Homepage: https://gnss-sdr.org
Language: C++
License: GPL-3.0
License Family: copyleft
Topics: sdr, gnss, c-plus-plus, signal-processing, gnuradio, gnss-sdr, gps, galileo, glonass, software-defined-radio, rtl-sdr
Last push: 2026-08-26T06:28:42+00:00

## Health v2 (maintenance only)
Score: 81/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 47, longevity 100
- inputs: {"age_days": 4525, "days_push": 7, "days_rel": 141, "gap_med": 376, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2216, forks 726 (observed 2026-08-28T04:06:27.118107+00:00)

## What it is
An open-source software-defined GNSS (Global Navigation Satellite System) receiver implemented in C++ on top of GNU Radio. It processes raw RF samples from a wide range of front-ends to perform acquisition, tracking, telemetry decoding, observables computation, and position fixes for GPS, Galileo, GLONASS, BeiDou, and QZSS signals.

## Use cases
- compute GPS/Galileo position fixes from raw signal samples
- process RTL-SDR or other RF front-end recordings into PVT solutions
- research and prototype custom GNSS signal processing chains
- decode navigation messages from GPS L1 C/A, Galileo E1b/c, GLONASS, BeiDou signals
- run a software GNSS receiver on embedded Linux devices
- inspect and monitor internal receiver channel parameters in real time
- cross-compile a configurable GNSS receiver for custom hardware

## When to choose
- you need a fully open-source, inspectable GNSS receiver with configurable processing blocks
- you want to experiment with multi-constellation, multi-frequency GNSS signals (GPS, Galileo, GLONASS, BeiDou, QZSS)
- you need to process raw IF samples from files or a variety of RF front-ends
- you are doing GNSS research, education, or algorithm prototyping on commodity hardware
- you need a receiver that runs on embedded GNU/Linux platforms

## When to avoid
- you just need a plug-and-play navigation solution with a standard NMEA output from a commercial GNSS chip
- you require certified, safety-critical positioning with guaranteed performance
- you need real-time processing of high-bandwidth signals on very resource-constrained hardware without tuning
- you want a simple GUI-driven consumer GPS application rather than a configurable signal processing framework

## Facets
- artifact type: application
- maturity: active
- function: sdk, developer-tools
- domain: embedded-systems, hardware
- platform: cross-platform, cpp
- tags: gnss, software-defined-radio, gps, galileo, glonass, beidou, gnuradio, rtl-sdr, positioning, rtklib, pvt-solution, signal-acquisition, signal-tracking, navigation-message-decoding, research-tool, signal-processing, real-time, research, linux, macos

## Member repositories
- gnss-sdr/gnss-sdr (main) score 81

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:27.118107+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:45:56.849783+00:00, confidence not recorded.
  - readme: https://github.com/gnss-sdr/gnss-sdr (fetched 2026-08-28T04:06:27.118107+00:00, sha 45b745805aff)
  - homepage: https://gnss-sdr.org (fetched 2026-08-29T10:26:15.693347+00:00, sha 503a0c2aff2c)
  - site_page: https://gnss-sdr.org/docs (fetched 2026-08-29T10:26:15.695622+00:00, sha f6a93966f30d)
  - site_page: https://gnss-sdr.org/about (fetched 2026-08-29T10:26:15.697264+00:00, sha e800b8ee7715)
  - site_page: https://gnss-sdr.org/build-and-install (fetched 2026-08-29T10:26:15.698894+00:00, sha 5194195bbd03)
  - site_page: https://gnss-sdr.org/docs/sp-blocks (fetched 2026-08-29T10:26:15.700874+00:00, sha cc1200177468)
  - site_page: https://gnss-sdr.org/docs/tutorials/monitoring-software-receiver-internal-status (fetched 2026-08-29T10:26:15.702396+00:00, sha c32704ff003f)
  - site_page: https://gnss-sdr.org/docs/tutorials/testing-software-receiver-2 (fetched 2026-08-29T10:26:15.704584+00:00, sha 0ba55981dfe8)
  - site_page: https://gnss-sdr.org/docs/tutorials/testing-software-receiver (fetched 2026-08-29T10:26:15.707752+00:00, sha 378622b3687c)
  - site_page: https://gnss-sdr.org/docs/tutorials/configuration-options-building-time (fetched 2026-08-29T10:26:15.709913+00:00, sha b7471e72971e)
- Data as of 2026-08-30T08:39:29.467469+00:00.