|April, 2012||New Journal Article about Nearly Optimal Galileo E5 Receiver by WNAV Team|
|March, 2012||New UML-Based Documentation for the PVT Module|
|February, 2012||The Witch Navigator Receives BeiDou Signals|
|February, 2012||The Witch Navigator Receives Galileo E5 Signals by the New IOV Satellites|
|May, 2012||19th Saint Petersburg International Conference on Integrated Navigation Systems|
The Witch Navigator is an open source project of a GNSS software receiver able to process signals of GPS, GLONASS, Galileo, COMPASS, WAAS, EGNOS, QZSS, and others. You can
The aim of this project is to develop a GNSS software receiver capable to process most of the present and future GNSS signals. The main design requirements include
The Witch Navigator is intended to be employed in the following applications:
The team is expected to constantly develop new versions of the Witch Navigator. The focus will be placed on
While releasing new versions of the Witch Navigator, the programming interface is allowed to undergo only minor changes in order to support cross-version compatibility.
Cooperation on this project is widely welcomed. The Witch Navigator project is an open source project and anybody can contribute. The comments, ideas and files can be shared via user forum. However, the most enthusiastic users may contact the project manager and become an active member regardless of the place they live at. Czech Technical University students have a chance to enroll in various projects concerning the Witch Navigator.
The license of the Witch Navigator software is the General Public License version 2 (GNU 2). This enables the users to freely download, modify and distribute the uploaded files.
The first prototypes of the Witch Navigator receiver boards were manufactured by MESIT přístroje (Uherské Hradiště, Czech republic). Nowadays, the boards are produced by Developement and Implementation Laboratories (LVR) at the Faculty of Electrical Engineering, the Czech Technical University in Prague.
|3.0||Interconnection of ExpressCards||Under construction||Maximum of 8 cards to be connected|
|2.0||Upgrade to QPSK Universal Correlators||Tested||2 * max. 10230 samples in a channel|
|Clock synthesis stability increased|
|1.1||Metal shield added||Released|
|Connector for external sensor added|
|Connector for interconnection of cards added|
|1.0||2 RF-tunable L-band channels max. 20 MHz bandwidth||Released||Direct conversion|
|2 8-bit dual ADCs||Each 8-bit I,Q outputs|
|24 E/L complex BPSK Universal Correlators||Any code max. 10230 samples|
|Signal capture unit||2 20-MBps samples to PC|
|PCI Express controler||DMA to PC, memory write to FPGA|
|I2C controler||Between FPGA and RF tuners|
|20 MHz stable quartz oscillator||Max. 1 ppm|
There are few other open source GNSS projects. These include ASIC and FPGA-based correlators, (pure) software defined radio receivers, GNSS processing and simulation software, and open hardware projects. There is a link to a portal. We gather some of the useful projects into the following table.
|Project Name and Link||Description|
|The Essential GNSS Project||GNSS project in C++|
|RTKLIB||RTK-oriented software in C|
|GNSS SDR||Global Navigation Satellite System Software Defined Receiver - Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) in C++|
|GPS ToolKit Software (GPSTk)||GPS position, velocity, time estimation software written in C++|
|OSGRS||Open Source GNSS Reference Server (A-GPS, A-GNSS)|
|GNSS-SDR||Scilab project focused on GPS, GLONASS and COMPASS processing|
|GPS & GLONASS RX||GPS & GLONASS receiver in assembler code|
|Namuru SDR||Fully FGPA-based GNSS receiver|