www.pudn.com > GNSS_SDR.zip > README.asv, change:2007-06-16,size:3879b
General ======= The software in this distribution is developed to work with the 'CU AAU SiGe SE4110L-EK3' L1 band GNSS data acquisition module as a tool for both teaching and learning software GNSS receiver techniques. The software is licensed under GNU GPL version 2. License agreement is enclosed in file COPYING_GPL.txt The software has been designed to work under WinXP and tested only under that platform. Please note that the module and software have been developed to keep costs as low as possible. Thus it will not be possible to support the device/software beyond this simple readme and files bundled here. We have tested the module and software on a number of different platforms with about a 95% success rate (some USB chipsets (Intel- based) seem to work better than others. If having issues on one platform, a different platform should work. In order to allow users to try and resolve issues and simplify development, the code associated with project has been built on the open source philosophy and all source code has been included. Note: the module has been designed for an active antenna. The module is powered by the host USB port and provide the USB voltage (~5V for this purpose). It is unlikely to power "hungry" amplifiers or do well in the event of a short. More details may be found here: http://ccar.colorado.edu/gnss THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. Installation ============ First thing to do is to install the driver part. This is done by connecting the module using a USB cable to the PC. Windows will then ask for a driver to assign to the module. You should answer "NO" to the questions regarding searching for a driver on the web and automatic installation. Instead direct windows to the driver directory in this software package by means of the [Have disk..] option. You should direct it to the \driver\ directory in this software package. Second, copy the application to c:\GN3s or any other location of your choice, preferably within your system\ partition. It is recommended for your convenience that you include this directory to the search space for the command line interface, e.g: path = %PATH%;c:\GN3s\ Usage ===== This command line application requires only one parameter to run, that is the name of the file where to save data. By running the application at any time without any parameters will view the usage options as below: ---- GN3S - GNSS IF Streamer for Windows ---- Usage: GN3S [drive:\][path\]filename [options] Options: -s filesize : Number of MB to collect (1-625), default: 32 MB -m : Buffer data in memory, default: no buffering <can be useful for slow hard drives, but requires a significant amount of available physical memory> No default suffix will be appended to the filename and the use of '.bin' is encouraged, as well as having a separate directory designated to saving GNSS data. The user will NOT be prompted when saving data to an existing file. The old data WILL be overwritten. Data processing =============== This toolkit provides the user with up to 40 seconds of data with the following parameters: Fsa = 16.3676 MHz IF = 4.1304 MHz BW = ~2 MHz 2556000 Data is saved as 8 bit signed values, corresponding to 'int8' in Matlab. With "A Software-Defined GPS and Galileo Receiver: A Single- Frequency Approach", K. Borre, D. Akos, et.al. (ISBN: 0817643907) comes a DVD containing Matlab based processing algorithms well suited for processing this kind of data. Enjoy!