Accelerating GNSS Software Receivers

Fernández-Prades, Carles; Arribas, Javier; Closas, Pau

This paper addresses both the efficiency and the portability of a computer program in charge of the baseband signal processing
of a GNSS receiver.

tm (tape mark), a simple tool to analyse magnetic tapes on unix.

Web forum for the PlutoSDR software defined radio platform.

Emacs-like editor running in the web browser.

A simple SDR console application
SDR client and server for low bandwidth remote operation
Command line receiver for unattended operation
Transmit support (planned for v2 in 2018)
Primarily targeting Linux desktop and SBCs with limited resources
Written in cross-platform C/C++
Easy deployment thanks to minimal external dependencies

Nanosdr is still a work in progress with initial public release expected around the end of 2017

The entire desire to do this came about from reading about building a Stratum 1 clock using a Raspberry PI at http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html and from the use of a Sony radio clock to provide WWVB pulses from the WWVB receiver module that was used in the radio clock.

However, all of the projects and examples I found used Linux which I did not really want to use. I much preferred to use NetBSD, but it lacked a number of critical features that would be required to make a properly working Stratum 1 clock. Interrupt support for the GPIO pins was needed and adding a PPSAPI driver that could be triggered by a GPIO interrupt would be necessary.

Different microcontrollers normally have different developing tools . For instance Arduino rely on Arduino IDE. Few more advanced users set up different graphical interfaces like Eclipse for better project management. Sometimes it may be hard to keep up with different microcontrollers and tools. You probably thought that single unified development tool could be great. Well this is what PlatformIO open source ecosystem is for.

This is cross platform code builder and library manager with platforms like Arduino or MBED support. They took care of toolchains, debuggers, frameworks that work on most popular platforms like Windows, Mac and Linux. It supports more than 200 development boards along with more than 15 development platforms and 10 frameworks.

UBports is the successor of Ubuntu touch

Here you can find my software, developed for radio amateur's use, all freeware.

From raw RF samples of the GPS L1 C/A signal to a position fix, in a completely open fashion.