When connecting an industrial camera to a drone, you need to choose the appropriate interface and cable based on the type of camera, its functions, and the hardware architecture of the drone. The following are common connection solutions and key considerations:
1. Common interface types
1. USB 3.0/3.1 (Type-C)
- Purpose: Transmission of image data (up to 5-10Gbps).
- Cable requirements: Short distance (<3 m), shielded twisted pair cable, lightweight design.
- Application scenarios: high resolution visible light cameras (such as Sony RX0), small multi-spectral cameras.
Note: Long distance easy signal attenuation, need to add repeater or use active cable.
2. GigE (Gigabit Ethernet)
- Use: long-distance data transmission (within 100 meters, 1Gbps).
- Cable requirements: Cat6/Cat6A shielded network cable, PoE (Power over Ethernet) can reduce additional power cables.
- Application scenarios: LiDAR (e.g. Velodyne), multi-sensor fusion system.
Note: The UAV must support PoE switches or power supply modules.
3. HDMI/SDI
- Purpose: real-time video streaming (1080p/4K).
- Cable requirements: Low latency coaxial line (HDMI) or BNC interface cable (SDI).
- Application scenario: Aerial camera (such as DJI Zenmuse), monitoring live broadcast.
Note: HDMI is vulnerable to electromagnetic interference and requires shielding.
4. MIPI CSI-2
- Purpose: Embedded camera directly connected to flight control (such as Raspberry PI or NVIDIA Jetson).
- Cable requirements: Flexible flat cable (FFC/FPC), the length is usually <30cm.
- Application scenario: Lightweight AI edge computing cameras (such as Stereolabs ZED cameras).
Note: The CSI interface is reserved for the flight control board and is only applicable to embedded systems.
5. CoaXPress (CXP)
- Use: Ultra-high speed industrial camera (6.25Gbps/ channel, multi-channel superposition).
- Cable requirements: coaxial line (support long distance, strong anti-interference).
- Application scenario: High-speed inspection cameras (such as Photron SA-Z series).
Note: Special capture card is required, the cost is high.
2. Power supply demand
- Independent power cord:
Cameras with high power consumption (such as thermal imagers) need to be powered separately, and 12V/24V DC power cables are commonly used.
Requires drone battery splitter or additional mounted batteries.
- PoE (Power over Ethernet) :
GigE interface cameras can be powered by a network cable (such as the FLIR Blackfly S).
- Low power USB power supply:
USB 3.0 provides 5V/1A power supply for small cameras.
3. synchronization and trigger interface
- GPIO (General Input/Output) :
For flight control and camera hardware synchronization (such as shutter trigger).
The PWM/GPIO pins of the flight control need to be connected with Dupont or custom strip wires.
- PPS (pulses per second) :
Timestamp synchronization (accuracy ±1μs) is provided via GPS module.
- Hardware trigger cable:
When multiple cameras work together, a master/slave trigger signal line is required (such as a multi-spectral camera array).
4. Install adaptive components
- Shock-proof connector:
Use an aviation plug with a spring lock (such as LEMO or M12 connector) to prevent vibration from causing it to fall off.
- Electromagnetic shielding:
The cable is wrapped with a metal braided layer or magnetic ring to reduce motor interference of the drone.
- Cable Management:
Cables are fixed with nylon cable ties and heat shrink tubes to avoid entangling the propeller.
5. Typical configuration examples
- Application Scenario Camera Type Interface Scheme Cable selection
- Precision Agriculture multi-spectral camera GigE + PoE power Cat6A shielded network cable
- Power inspection Thermal imaging camera USB 3.1 + Independent 12V power cable Twisted pair shielded cable + power cable
- High speed industrial inspection High speed camera CoaXPress + trigger signal line coaxial line + GPIO line
- Embedded AI visual edge computing camera MIPI CSI-2 + GPIO synchronizes FFC flexible wiring
6. Precautions
- Weight and space: Too much or too long cable may affect the endurance and stability of the drone.
- Protocol compatibility: Verify that the flight control system supports camera communication protocols (e.g. UVC, GenICam).
- Heat dissipation: High power interfaces (such as CoaXPress) need to consider heat dissipation design.
- Redundant backup: Dual links (such as HDMI+USB) can be used to prevent signal interruptions in critical tasks.
Through the reasonable selection of interfaces and cables, the efficient integration of industrial cameras and drones can be achieved to meet the data acquisition needs of different scenarios.
