Timeline of GNSS SDR Developments
| Year | Milestone with comment | Reference |
|---|---|---|
| 1995 | Emergence of software radio approach | (Mitola, 1995) |
| 1996 | First publication of a GPS SDR development | (Akos & Braasch, 1996) |
| 1999 | First real-time software receiver with GPS L1 C/A code | (Akos et al., 2001) |
| 2000 | First textbook on GPS SDR published | (Tsui, 2000) |
| 2002+ | Use of bit-wise correlation and SIMD instructions | (Ledvina et al., 2003; Pany et al., 2003) |
| 2002+ | GNSS SDRs as commercial products | NordNav, IFEN, Trimble, Locus Lock, etc. |
| 2004 | First multi-GNSS/multi-frequency GNSS SDRs | (Ledvina, Psiaki, Sheinfeld, et al., 2004; Pany, Eissfeller, et al., 2004) |
| 2004 | First real-time GNSS/INS integration with SDR | (Gunawardena et al., 2004) |
| 2005 | GNSS SDR consolidation at Politecnico di Torino and LINKS Foundation | Section 3.9 |
| 2005 | Demonstration of vector tracking with a GNSS SDR | (Pany et al., 2005) |
| 2006 | First real-time all-in-view embeddable GNSS SDR | (Humphreys et al., 2006) |
| 2006 | First use of SDR technology for AM SOP | (McEllroy, 2006; McEllroy et al., 2006) |
| 2007 | Start of widespread adoption of SDR technology in GNSS research | (Borre et al., 2007) |
| 2007 | First development of a snapshot receiver | Section 3.8 |
| 2009 | First multicore GNSS SDR | (Humphreys et al., 2009) |
| 2010 | Adoption of a computer science best-practice collaborative framework | Section 3.5 |
| 2010 | First use of GPUs for correlation | (Hobiger et al., 2010) |
| 2011+ | Use of GNSS SDR for ionospheric research | (O’Hanlon et al., 2011; Peng & Morton, 2011) |
| 2012+ | SDR developments at the Finnish Geospatial Research Institute | (Borre, Fernández-Hernández et al., 2022; Söderholm et al., 2016) |
| 2012 | Use of a DVB-T ultra-low-cost front-end for GNSS SDR | Section 3.5 |
| 2012+ | Use of SDR technology for LTE SOP | (del Peral-Rosado et al., 2013; Driusso et al., 2017; Shamaei et al., 2018) |
| 2014+ | Use of GNSS SDRs | (Lightsey et al., 2014; Murrian et al., 2021) |
| 2014 | Use of SDRs for mixed cellular 3G GSM/CDMA and digital television SOP | (Yang et al., 2014) |
| 2015+ | Abundance of processing power for GNSS SDR available | (Dampf et al., 2015; Nichols et al., 2022) |
| 2017+ | Use of SDRs for 3G CDMA and 4G LTE SOP | (Kassas et al., 2017) |
| 2018 | First use of Python for dedicated teaching of GNSS SDR | Section 3.7 |
| 2018 | First SDR enabling sub-meter-level carrier-phase-based uncrewed aerial vehicle navigation with 3G CDMA and 4G LTE SOP | (Khalife & Kassas, 2018, 2022) |
| 2020 | Formal adoption of ION SDR Standard | Section 5 |
| 2020 | Use of SDR for stationary positioning with multi-constellation Orbcomm and Iridium LEO SOP | (Farhangian & Landry, 2020; Orabi et al., 2021) |
| 2021 | First SDR for 5G SOP | (Shamaei & Kassas, 2021b) |
| 2021+ | Use of GNSS SDR to support development of new navigation satellite systems | (Miller et al., 2023; Song et al., 2021) |
| 2021 | First SDR enabling vehicle navigation with multi-constellation LEO SOP | (Kassas et al., 2023, 2021) |
| 2022 | First SDR enabling aircraft navigation with cellular SOP | (Kassas, Abdallah, et al., 2022; Kassas, Khalife, Abdallah, Lee, Jurado, et al., 2022) |