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A GNSS receiver, in general, is an electronic device that receives and digitally processes the signals from a navigation satellite constellation in order to provide position, velocity and time (of the receiver).
GNSS receivers have been traditionally implemented in hardware: a ''hardware GNSS receiver'' is conceived as a dedicated chip that
In a software GNSS receiver, all digital processing is performed by a general purpose [[microprocessor]]. In this approach, a small amount of inexpensive hardware is still needed, known as the ''[[RF front end|frontend]]'', that digitizes the signal from the satellites. The microprocessor can then work on this ''raw'' digital stream to implement the GNSS functionality.
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Currently, most of the GNSS receiver market is still ''hardware''. However, there already exist operational solutions based on the software approach able to run on low-cost microprocessors. Software GNSS receivers are expected to increase their market share or even take over in the near future, following the development of the computational capabilities of the microprocessors ([[Moore's law]]).
== Comparison of GNSS SDR implementations ==
{{Needs table|section=y|date=August 2015}}
*'''Galileo Satellite Navigation LTD.- GSN''':
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*** Multi-correlator: yes
*** Sample data recording: yes
*** [[Multipath mitigation]]: yes (several algorithms)
* '''GNSS-SDRLIB'''
**''General information:''
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***[[Software licence]]: Commercial
***Publication: [https://radionavlab.ae.utexas.edu/wp-content/uploads/2022/10/Nichols_ION_GNSS_2022.pdf Software-Defined GNSS is Ready for Launch]
***Contact: [https://radionavlab.ae.utexas.edu/contact/ Radionavigation Laboratory], [https://locuslock.com/contact-3/ Locus Lock]
** ''Development:''
*** Programming language: C++
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