How to spoof GPS signal

Hardware

SDR: HackRF One - 265€

Clock: LeoBodnar Precision Frequency Reference GPS Clock - 197€

Cables

Software

Figuring out what you need to install to get going can be a drag, so I’ll spare you the work and tell you how to quickly get started on an Ubuntu 14.04 LTS system.

Don’t worry, this is going to be relatively painless.

Here’s what we’re going to do:

• Install some dependencies,
• Build and Install the HackRF Host Software (libraries and tools),
• Install GNU Radio,
• Build and Install GrOsmoSDR,
• Build and Install Gqrx, and finally
• Use Gqrx to tune into a local FM radio station.

Install Dependencies

1. Install the build dependencies.

   $ sudo apt-get install git \
                          build-essential \
                          cmake \
                          libusb-1.0-0-dev \
                          liblog4cpp5-dev \
                          libboost-dev \
                          libboost-system-dev \
                          libboost-thread-dev \
                          libboost-program-options-dev \
                          swig
   

2. Create a working directory.

   $ mkdir ~/sdr
   

Build HackRF Host Software

1. Clone the HackRF repository.

   $ cd ~/sdr
   $ git clone https://github.com/mossmann/hackrf.git
   

Note: When I cloned, I got changeset 740940f8. As this article ages, you will likely get a different version, and that’s okay. I’m just recording this as a known-working version.

1. Move to the hackrf/host directory.

   $ cd hackrf/host
   

2. Create the build directory, move to it, and use Cmake (installed earlier) to create the Makefiles required for building.

   $ mkdir build && cd build
   $ cmake ../ -DINSTALL_UDEV_RULES=ON
   

3. Build and Install.

   $ make
   $ sudo make install
   $ sudo ldconfig
   

Test the HackRF Device

1. Connect the your HackRF One.

2. Run the hackrf_info tool to get some device information.

   $ hackrf_info
   Found HackRF board.
   Board ID Number: 2 (HackRF One)
   Firmware Version: ...
   Part ID Number: ...
   Serial Number: ...
   

Download and Install GNU Radio

Now let’s download and install GNU Radio.

$ sudo apt-get install gnuradio \
                       gnuradio-dev \
                       gr-iqbal

Note: When I installed, I got version 3.7.2.1.

Download, Build, and Install GrOsmoSDR

Now we’ll download, build, and install GrOsmoSDR. GrOsmoSDR is essentially middle-ware that allows GNU Radio to communicate with the HackRF software to control your HackRF One.

1. Clone the GrOsmoSDR repository:

   $ cd ~/sdr
   $ git clone git://git.osmocom.org/gr-osmosdr
   

Note: When I cloned, I got changeset 58d95b51.

1. Move to the repository:

   $ cd gr-osmosdr
   

2. Create the build directory, move to it, and use Cmake to create the Makefiles required for building.

   $ mkdir build && cd build
   $ cmake ../
   

3. Build and Install.

   $ make
   $ sudo make install
   $ sudo ldconfig
   

Download, Build, and Install Gqrx

1. Follow this instructions:

   $ sudo apt-get install gqrx-sdr
   $ sudo apt-get install libvolk1-bin
   $ volk_profile
   

Download, Build, and Install GPS-SDR-SIM

1. Clone the GPS-SDR-SIM repository:

   $ cd ~/sdr
   $ git clone https://github.com/osqzss/gps-sdr-sim
   

1. Move to the repository:

   $ cd gps-sdr-sim
   

2. To build it use GCC:

   $ gcc gpssim.c -lm -fopenmp -o gps-sdr-sim
   

How to add path to home directory

• open file browser home dir
• Ctrl-H to show hidden files
• open file: .bashrc
• add this line:

export PATH="/home/user/sdr/gps-sdr-sim:$PATH"

How to test external clock

$ hackrf_si5351c -n 0 -r

How to create NMEA path

How to get BRDC file

Prepare broadcast file

Dynamic mode:

$ gps-sdr-sim -b 8 -e brdc2400.16n -g nmea.txt

Static mode (location China):

$ gps-sdr-sim -b 8 -e brdc2400.16n -l 30.286502,120.032669,100

Initiate broadcast

$ hackrf_transfer -t gpssim.bin -f 1575420000 -s 2600000 -a 1 -x 0