BladeRF GPS Jammer

Testing suite for GPS signal disruption using BladeRF xA9 SDR.

Hardware Requirements

• BladeRF xA9 SDR
• Host computer with USB 3.0

Software Prerequisites

System Dependencies

# Ubuntu/Debian
sudo apt-get update
sudo apt-get install libbladerf-dev libbladerf2 bladerf

Python Setup

Easy setup with script:

# Create virtual environment
python3 -m venv venv
source venv/bin/activate

# Run setup script - installs everything including BladeRF bindings
chmod +x setup_bladerf.sh
./setup_bladerf.sh

Or manual setup:

source venv/bin/activate
pip install -r requirements.txt
# Then manually install BladeRF Python bindings from source

Quick Start

Single Band Jamming

Each script targets a specific GPS band:

# L1 Band - 1575.42 MHz 
python transmit_gps_l1.py

# L2 Band - 1227.60 MHz 
python transmit_gps_l2.py

# L5 Band - 1176.45 MHz 
python transmit_gps_l5.py

Dual Band Jamming

Simultaneous transmission on two bands (power is split):

# L1 + L2 combo
python transmit_gps_l1_l2_dual.py

# L1 + L5 combo
python transmit_gps_l1_l5_dual.py

# L2 + L5 combo
python transmit_gps_l2_l5_dual.py

Note: Dual mode splits power between channels, resulting in weaker signals per band.

Configuration

Default settings (edit at top of each script):

• Bandwidth: 2 MHz per channel
• Sample Rate: 5 MSPS
• TX Gain: 60 dB (maximum)
• Signal Type: White noise

Adjusting Power Levels

# In script headers
TX_GAIN_DB = 60  # Range: -15 to 60 dB

Frequency Adjustment

# Modify at top of scripts
FREQUENCY_MHZ = 1575.42  # Your target frequency

Technical Details

GPS Bands

• L1: 1575.42 MHz - Used by all consumer GPS devices
• L2: 1227.60 MHz - Military P(Y) code + Civilian L2C
• L5: 1176.45 MHz - Newest civilian band, higher precision

Power Output

• Maximum gain: 60 dB
• Output power: ~20 dBm (100mW) at max gain
• Lower frequencies (L5/L2) naturally output more power than L1

Signal Generation

• Generates pseudo-random noise at full DAC scale
• 12-bit I/Q samples (SC16_Q11 format)
• Continuous transmission until interrupted

Troubleshooting

BladeRF Not Found

# Check device connection
bladeRF-cli -p

# Add udev rules if needed
sudo wget https://www.nuand.com/fpga/88-nuand-bladerf.rules -O /etc/udev/rules.d/88-nuand-bladerf.rules
sudo udevadm control --reload-rules

FPGA Version Warning

This warning is normal and can be ignored:

[INFO @ host/libraries/libbladeRF/src/helpers/version.c:103] FPGA version (v0.16.0) is newer than entries...

Python Import Errors

Ensure BladeRF Python bindings are properly installed:

python -c "import bladerf; print('Success')"

Stop Transmission

Press Ctrl+C to cleanly stop any running script.

Project Structure

├── README.md                    # This file
├── requirements.txt             # Python dependencies
├── setup_bladerf.sh            # BladeRF setup helper
├── transmit_gps_l1.py          # L1 band jammer
├── transmit_gps_l2.py          # L2 band jammer
├── transmit_gps_l5.py          # L5 band jammer
├── transmit_gps_l1_l2_dual.py  # Dual L1+L2
├── transmit_gps_l1_l5_dual.py  # Dual L1+L5
└── transmit_gps_l2_l5_dual.py  # Dual L2+L5