gnss-sdr | Development repo of GNSS-SDR , an open source GNSS software | 3D Printing library
kandi X-RAY | gnss-sdr Summary
kandi X-RAY | gnss-sdr Summary
This program is a software-defined receiver which is able to process (that is, to perform detection, synchronization, demodulation and decoding of the navigation message, computation of observables, and, finally, computation of position fixes) the following Global Navigation Satellite System's signals:.
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gnss-sdr Key Features
gnss-sdr Examples and Code Snippets
;######### CHANNELS GLOBAL CONFIG ############
Channels_1C.count=8 ; Number of available GPS L1 C/A channels.
Channels_1B.count=0 ; Number of available Galileo E1B channels.
Channels.in_acquisition=1 ; Number of channels simultaneously acquiring
Chan
;######### SIGNAL_SOURCE CONFIG ############
SignalSource.implementation=File_Signal_Source
SignalSource.filename=/home/user/gnss-sdr/data/my_capture.dat
SignalSource.item_type=gr_complex
SignalSource.sampling_frequency=4000000 ; Sampling frequency i
$ cd gnss-sdr/build
$ cmake ..
$ make
$ cmake -DCMAKE_BUILD_TYPE=Debug ..
$ make
$ sudo make install
$ make doc
$ make pdfmanual
$ make doc-clean
$ cd ..
$ mkdir eclipse && cd eclipse
$ cmake -G "Eclipse CDT4 - Unix Makefiles" -DCMAKE_
Community Discussions
Trending Discussions on gnss-sdr
QUESTION
Is it possible to demonstrate GPS spoofing with GNSS SDR sim or GPS SDR sim? I found multiple examples with real antennas, but I would like to do it virtually (in SDR).
EDIT:
I found multiple examples on forums threads that this is possible, but I still can't find any tutorial or something similar. My problem is that GPS-sdr-sim generates .bin
file which is probably not correct format for GNSS-SDR. When I run it with gnsdr.conf
, I get messages for duration of generated signal:
...Current receiver time: 1 s
Tracking of GPS L1 C/A signal started on 3 for satellite GPS PRN 19 (Block IIR)
Tracking of GPS L1 C/A signal started on channel 2 for satellite GPS PRN 26 (Block IIF)
Loss of lock in channel 2!
ANSWER
Answered 2019-Oct-13 at 14:28I found multiple examples on forums thread how it is possible, but I still can't find any tutorial or something similar. My problem is that GPS-sdr-sim generates .bin file which is probably not correct for GNSS-SDR.
QUESTION
I am trying to work on a project that uses the boost C++ library. The project in question is
When I run make in the build directory I get
...ANSWER
Answered 2019-Aug-16 at 13:22I have seen this kind of problem before.
It was an error in the order in which includes were done.
Actually we used this kind of error on purpose to find the places in the code where we did it wrong.
So, @Scheff is most likely right. There is a #define timeout somewhere which shadows the intended timeout.
And yes, old style macros are evil nowadays when we have C++11, but old style macros in lowercase deserve a special place in hell.
QUESTION
ANSWER
Answered 2017-Apr-13 at 09:07The pedantically correct way to check that a .so
exports a symbol is nm --demangle --dynamic --defined-only --extern-only | grep
.
Without --defined-only
your command also shows undefined symbols.
Without --extern-only
it also shows symbols with internal linkage which are unavailable for linking.
It looks like you need to link another library because Gps_Ephemeris::Gps_Ephermeris()
is not resolved by linking libgnss_system_parameters_dyn.so
. A good way to start is that library's documentation and examples.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install gnss-sdr
If you want to start building and running GNSS-SDR as quickly and easily as possible, the best option is to install all the required dependencies as binary packages.
This option is adequate if you are interested in development, in working with the most recent versions of software dependencies, want more fine-tuning on the installed versions, or simply in building everything from the scratch just for the fun of it. In such cases, we recommend using PyBOMBS (Python Build Overlay Managed Bundle System), GNU Radio's meta-package manager tool that installs software from source, or whatever the local package manager is, that automatically does all the work for you. Please take a look at the configuration options and general PyBOMBS usage at https://github.com/gnuradio/pybombs. Here we provide a quick step-by-step tutorial.
The full stop separated from cmake by a space is important. CMake will figure out what other libraries are currently installed and will modify Armadillo's configuration correspondingly. CMake will also generate a run-time armadillo library, which is a combined alias for all the relevant libraries present on your system (e.g., BLAS, LAPACK, and ATLAS).
Go to GNSS-SDR's build directory:.
Import project using Menu File -> Import.
Select General -> Existing projects into workspace.
Select your root directory: Browse and select your newly created eclipse/ directory. Keep "Copy projects into workspace" unchecked.
Click on "Finish" and you will get a fully functional Eclipse project.
For more information, check out our quick start guide.
After building the code, you will find the gnss-sdr executable file at gnss-sdr/install. You can make it available everywhere else by sudo make install. Run the profilers volk_profile and volk_gnsssdr_profile for testing all available VOLK kernels for each architecture supported by your processor. This only has to be done once.
In post-processing mode, you have to provide a captured GNSS signal file. 1. The signal file can be easily recorded using the GNU Radio file sink in gr_complex<float> mode. 2. You will need a GPS active antenna, a USRP and a suitable USRP daughter board to receive GPS L1 C/A signals. GNSS-SDR requires to have at least 2 MHz of bandwidth in 1.57542 GHz. (remember to enable the DC bias with the daughterboard jumper). We use a DBSRX2 to do the task, but you can try the newer Ettus' daughter boards as well. 3. The easiest way to capture a signal file is to use the GNU Radio Companion GUI. Only two blocks are needed: a USRP signal source connected to a complex float file sink. You need to tune the USRP central frequency and decimation factor using the USRP signal source properties box. We suggest using a decimation factor of 20 if you use the USRP2. This will give you 100/20 = 5 MSPS which will be enough to receive GPS L1 C/A signals. The front-end gain should also be configured. In our test with the DBSRX2 we obtained good results with G=50. 4. Capture at least 80 seconds of signal in open sky conditions. During the process, be aware of USRP driver buffer underruns messages. If your hard disk is not fast enough to write data at this speed you can capture it to a virtual RAM drive. 80 seconds of signal at 5 MSPS occupies less than 3 Gbytes using gr_complex<float>. If you have no access to an RF front-end, you can download a sample raw data file (that contains GPS and Galileo signals) from here.
You are ready to configure the receiver to use your captured file among other parameters: The default configuration file resides at /usr/local/share/gnss-sdr/conf/default.conf. You need to review/modify at least the following settings: SignalSource.filename= (absolute or relative route to your GNSS signal captured file) GNSS-SDR.internal_fs_sps= (captured file sampling rate in samples per second) SignalSource.sampling_frequency= (captured file sampling rate in samples per second) SignalConditioner.sample_freq_in= (captured file sampling rate in samples per second) SignalConditioner.sample_freq_out= (captured file sampling rate in samples per second) The configuration file has in-line documentation, you can try to tune the number of channels and several receiver parameters. Store your .conf file in some working directory of your choice.
Run the receiver invoking the configuration by $ gnss-sdr --config_file=/path/to/my_receiver.conf The program reports the current status in text mode, directly to the terminal window. If all goes well, and GNSS-SDR is able to successfully track and decode at least 4 satellites, you will get PVT fixes. The program will write .kml, .geojson and RINEX files in the folder from which gnss-sdr was run. In addition to the console output, GNSS-SDR also writes log files at /tmp/ (configurable with the commandline flag ./gnss-sdr --log_dir=/path/to/log).
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