A software GNSS receiver is a GNSS receiver that has been designed and implemented following the philosophy of Software-defined radio.A GNSS receiver, in general, is an electronic device that receives and digitally processes the signals from a GNSS 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 have been designed and built (from the very beginning) with the only purpose of being a GNSS receiver.In a software GNSS receiver, all digital processing is performed by a general purpose microprocessor.