Category : Gnuradio jammer
In Germany such signals often came from oscillating TV antenna preamps, long forgotten and out of use on top of a roof, but still powered…usually the BNetzA the regulation authority was very helpful in finding those. Thank you for your helpful suggestions. We still haven't managed to pinpoint where the signal is coming from, but we have just dispatched a black SUV with a three letter acronym stencilled on it our university's initials to hunt for the signal with a spectrum analyzer and a yagi.
Yesterday the interference was a Today it has drifted up and down between This is very annoying as our frequency is I recorded a 10 second snippet of 50 kHz baseband signal in interleaved I and Q with bit floating point format. In python, one would read this with this command:.
You can probably feed this into gnuradio with the filesource and complex data type.
Patrik, you are doing cool stuff with the POES satellite receiving. I wish I had time to try that at some point. I would contact the person who count wolfs near you. It drifts between GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Frequency Hopping Spread Spectrum FHSS is a method of transmitting radio signals by continuously switching "hopping" over various frequencies determined by a pseudo random code.
We've built blocks to send PM modulated waves over 8 and 64 different frequencies, according to a maximally generated pseduo random code, synchronise the codes at recieving end, and using coherent demodulation to retrieve the message. Also, add a blank file blank. For documentation purposes. Guided Tutorial for making a block in python. Adding a block to GNUradio. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up. Python CMake Other. Python Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again.
Latest commit Fetching latest commit…. Pre-Requisite Libraries for GNUradio :- sudo apt-get install liblog4cpp5-dev sudo apt-get install swig sudo apt-get install doxygen sudo apt-get install libcppunit-dev sudo apt-get install cppunit sudo apt-get install cppunit-dev sudo apt-get install gnuradio-dev sudo apt-get install python-sphinx Running the code on your PC's GNUradio:- To install and use the blocks in GNUradio, clone the repository, make build folder in each block's directory, copy the compile.
If you've installed GNUradio directly from the git repository, this should suffice, but if not, you will have to do a little more to get the blocks on GNUradio. Please follow Troubleshooting steps mentioned at end. Troubleshooting :- Compile. You signed in with another tab or window.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a GRC project with multiple functionalities, but not all of them must be called at the same time. It this possible? Or is there any alternative similar solution? Internally, selector is a hierarchical block, and it will pause your flowgraph, disconnect the formerly active in- and output blocks connect the now active blocks, and then continue operation of the flow graph.
In that manner, it's not sample-accurate, and might not be the tool of choice. You might want to look into message passing instead of using variables, and go for the "Multiply with Matrix" block.
You might use an epy block with one input and n outputs. In the work function you can map input as you wish. Good luck! Learn more. Asked 4 years, 1 month ago. Active 1 month ago. Viewed 2k times. Bin Han. Bin Han Bin Han 21 5 5 bronze badges. Active Oldest Votes. Try the "Selector" block.
Friedrich Maar Friedrich Maar 3 3 3 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Its development was focused on modularity. This makes the project easy to extend and reuse its blocks. This project aims to provide a modular environment for an LTE downlink receiver. All blocks should be replacable. On the other hand it should be fairly easy to add new blocks to decode additional physical channels.
The block design aims to be modular and reusable. Where possible GR blocks are used. Furthermore message ports are used for configuration on runtime.
This is supposed to make the control flow visible to users and thus better understandable.
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Demel, S. Koslowski, and F. It performs OFDM operation to operate in the frequency domain and provides a channel estimator. At this point physical LTE downlink channels can be extracted from the symbols and be processed. It is not yet possible to just plug it in, though. Eventually all channels shall be supported. A lot of example flowgraphs are located in the examples folder. These include some hierarchical flowgraphs and the corresponding top-level flowgraphs. Two different algorithms for synchronization are available.
Compile and Install make -jX where X is a number of choice Often the number of cores available sudo make install make it available in GRC. Afterwards reload blocks or restart GRC. This makes the hier blocks available in GRC just as all the other blocks. Have fun If everything runs without errors the gr-lte blocks should be available in GRC. It is supposed to contain a working flowgraph with all available blocks. Only the source must be updated. Specify the path to your recorded samples and update the resampler parameters.
By changing the variable 'fftlen' you update a whole bunch of other variables which basically configure the expected bandwidth and the maximum subcarriers the flowgraph can handle. Troubleshooting In case you have trouble with parts of the flowgraph etc. This way others with the same problem can find hints in the mailinglist archives. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up. Branch: master. Find file. Sign in Sign up. Go back.I thought it would be a great episode for the podcast. But first of all, tell us what you did with the HackRF and what do we have here in front of us now? I did a little research and ultimately I was trying to accomplish creating a portable way of using the HackRF without needing to connect it to my laptop, mainly for the sake of using it as a demoing device for spectrum analysis and being able to show the spectrum utilization when the HackRF was transmitting on certain frequencies to a signal generator.
Also, to be able to demonstrate the spectrum analysis capabilities like in Ekahau and other tools where they can show channel utilization and how it affects transmissions and the receiving side.
Jerry Olla: Yeah, essentially. One of those is being a signal generator or a jammer. The HackRF is capable of generating signals which are 10 megahertz all the way up to 6 gigahertz, I believe. They take a regular Wi-Fi chip and they turn it into a signal generator that generates a Wi-Fi look. You can see either a CCK curve or off diem curve, but it kind of breaks the way.
Wi-Fi works and it just transmits the straight curve and then on a spectrum analyzer you can see it. So they made that as a signal generator to test your spectrum analyzer. What I see in front of me here is it looks like you have a little box, that box came with the PortaPack.
Keith Parsons: Yeah, it looks like a really big iPod with the little thumb wheel. Did it come with a little video screen as well? Keith Parsons: Good combination. So tell me what this does now?
What are those? It generates different signatures and is essentially what we see on the spectrum analysis using those different types. You can define specific different presets. Keith Parsons: You bought the additional quarterback to go with your HackRF and then you download an extra image and pushed down to the HackRF to run this? Does it have a little antenna on top? Jerry Olla: Yeah exactly! This is a pretty low gain one obviously you could amplify that signal a little more with a larger antenna.
Now when you use it, if you had a spectrum analyzer running that you could push on this, what is the shape that shows on the spectrum analyzer?When people consider upgrading from…. Just as TV went digital some years ago, the FCC desires that public safety agencies gradually migrate to digital radio systems as well.
Review & Teardown of a cheap GPS Jammer
A great…. Recommend this entry Has been recommended Send news. Log in No account? Create an account. Remember me. Facebook VKontakte Google. Previous Share Flag Next. A jammer can block radio communications on devices that operates on a given radio frequencies within its range i. A GPS jammer generates a The GPS jammer is typically a small, self-contained, battery powered and transmit signal over a small radius.
They can also block GPS-based road tolls that are levied via an on-board receiver. GPS jamming technology will also disable autopilot in drones to protect individuals' privacy. In the US federal law prohibits the sale or use of a transmitter e. Do NOT buy unless you have first checked the applicable laws of your country. All components except LEDs are surface mount, with some integrated circuits used throughout the design.
You can compare this jammer design with previously published one by the Phrack hacker magazine how to make a low-cost GPS jammer. We did spectral tests on the QH-1 Module and this simple design have surprisingly almost no excessive spurious emissions or harmonics, that is outside jamming the GPS L1 Signal. So this jammer will not disable your cellphone or wifi, only your GPS receiver.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. There are many ways to jam a signal, the easiest of which is obviously just to transmit over the signal you want to jam. Since USRPs can transmit, that essentially answers your question. Please note, however, that transmitting and thus jamming signals in spectrum that you don't have permission to use is illegal in almost every country in the world.
You will likely not get responses on how to do these things without giving details about what you are doing - nobody wants to enable illegal activity. There are two ways to do this. The simple way is to simply jam the radio band in use. However, if you do this and the state takes exception, you have made it dead easy to find you. If you don't want to make high powered RF transmissions then you need to get a good book on UMTS and learn how a intercell handoff works when a mobile phone passes from one cell to the next.
You could broadcast handoff signals causing user equipment to attempt to change cells. Since the new cell actually isn't expecting the user equipment the changeovers will fail and the phones will effectively jam each other. If I were you I wouldn't do this without written official permission because harder to find isn't the same as impossible to find. Learn more. Ask Question. Asked 7 years, 9 months ago. Active 2 years, 3 months ago. Viewed 2k times. Zangetsu Zangetsu 57 1 1 silver badge 4 4 bronze badges.
Active Oldest Votes. Peter Wone Peter Wone Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.