This project aims to establish secure communication between a satellite and a ground station using encryption and blockchain technology.
- /keys: Contains RSA key pairs for the satellite and ground station.
- /encryption: Encryption logic using RSA and AES.
- /blockchain: Implements a basic blockchain to log commands.
- /contracts: Smart contracts for managing satellite commands.
- /scripts: Scripts for the satellite and ground station.
- /data: Telemetry data in JSON format.
To install the required packages, run:
pip install -r requirements.txtsudo apt update
sudo apt install nodejs npm
sudo npm install -g truffle
npm install -g ganache-clitruffle init
truffle compile
truffle migrate
truffle deploytruffle console --network developmentThe satellite is designed to integrate advanced communication technologies, including laser communication for high-speed data transfer. Key components include:
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Raspberry Pi 4 :Acts as the processing unit for managing communication protocols and controlling the onboard laser systems.
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Camera Module (48MP): Captures high-resolution images and transmits them to Earth using laser communication.
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Laser Diode (650nm, 5mW): Serves as the primary communication channel, transmitting data in the form of light beams.
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Photodetector: Used to receive light signals for two-way communication or testing.
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Transimpedance Amplifier: Converts light signals into electrical signals for data processing.
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Lens System: Focuses and optimizes the laser beam for long-distance transmission.
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Power System: Solar panels and batteries supply energy to all components onboard.
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Collision Avoidance System: Ensures safe operation in crowded orbital regions.
- Operating Wavelength: 650nm (visible red laser), suitable for short-to-medium-range communication.
- Data Transfer Rate: Offers much higher speeds compared to traditional RF communication, capable of gigabit-level transfer rates.
- Beam Precision: Laser communication ensures highly focused beams, reducing interference and improving bandwidth utilization.
- Low latency and high-speed transmission.
- High security due to narrow beam divergence.
- Reduced risk of signal interception.
- Performance may be affected by weather conditions like rain, clouds, or atmospheric turbulence.
- Requires precise alignment between the satellite and ground station.
- Laser Diode Module: A 5mW, 650nm red laser serves as the primary transmitter for optical communication.
- Laser Driver Circuit (LM317): Provides stable current to the laser diode for efficient operation.
- Lens System: Enhances the beam’s focus and range. Can use Fresnel or aspheric lenses for cost-efficiency.
- Photodetector (Light-Dependent Resistor): Detects incoming laser signals for testing or two-way communication.
- Transimpedance Amplifier: Amplifies weak signals received from the photodetector.
- Safety Measures: Laser safety goggles and secure mounts to avoid beam misdirection or damage.
The ground station will track and communicate with the satellite, featuring the following components:
- Laser Receiver Module: Includes a photodetector and amplifier to capture laser signals.
- Telescope System: Tracks and focuses on the satellite's laser beam for precise alignment.
- Motorized Mount/Tripod: Adjusts the receiver's position to maintain alignment with the satellite’s orbit.
- Raspberry Pi with ADC (MCP3008): Processes incoming signals, converts analog signals to digital, and interfaces with the control systems.
- Communication Software: Handles decoding, error correction, and data visualization.
- Power System: Uninterruptible power supply (UPS) to ensure consistent operation.
- Weather Monitoring System: Detects adverse weather conditions like clouds or rain that may affect laser communication.