The 100Km Long Distance High-Speed UAV Video Data Transmission System Solution is a kind of special designed UAV drones Mesh self-organizing network system achieves beyond line of sight coverage through a decentralized architecture and multi hop relays. COFDM/MIMO technology ensures high-speed transmission over 100km, and the 1.2GHz frequency band and high gain antenna extend the air to ground distance to 100km+. It supports 4K image transmission and millisecond level low latency.
The core of the long-distance high-speed transmission of unmanned aerial vehicle data link self-organizing network system is to expand coverage through Mesh unmanned center self-organizing network+multi hop relay, combined with COFDM/MIMO/adaptive modulation to improve bandwidth and anti-interference, and combined with frequency band optimization, high gain antenna, power control and other means, to achieve high-speed interconnection beyond line of sight between air and ground and air.
1、 Core networking architecture: decentralized Mesh+multi hop relay (distance breakthrough key)
A. Center-less Mesh Ad Hoc Network (Basic)
- Node equivalence: Drones, ground stations, and relay nodes have equal status and do not need to rely on base stations. Once powered on, they automatically form a network.
- Multi hop relay: automatically switches multi hop paths when a single hop is blocked, with a maximum hop count greater than 10; The air to ground line of sight can reach 50-100km, and the coverage radius can be increased by more than 15 times after multi hop stacking.
- Dynamic routing+self-healing: real-time calculation of the optimal path (signal strength, latency, bandwidth); When a node fails/moves out, reconstruct the network within 100ms without interruption of communication.
B. Air relay networking (distance doubling)
- Single drone relay: Forward ground signals to obstructed areas, increasing coverage by 3-5 times.
- Multi machine chain/mesh relay: 2-3 drones are connected in series to achieve 100km+over the horizon transmission; The signal overlap rate between adjacent nodes is ≥ 30% to ensure stable relay.
2、 High speed transmission core technology (bandwidth and stability guarantee)
A. Modulation and Multiple Access: COFDM+MIMO+Adaptive Coding
- COFDM (Orthogonal Frequency Division Multiplexing): High speed data is split into multiple low-speed sub-carriers, which are resistant to multi-path fading and occlusion, and suitable for non line of sight scenarios.
- MIMO (Multiple Input Multiple Output, 2T2R/4T4R): Multiple antenna transmission and reception, increasing 5-8dB spatial diversity gain and doubling channel capacity; The peak speed can reach 108Mbps under a 40MHz bandwidth.
- Adaptive Modulation and Coding (AMC): When the channel quality is good, 64QAM/256QAM (high speed) is used, differential time cut QPSK (reliable) is used, and the rate and distance are dynamically balanced.
B. Anti interference and error correction
- FEC Forward Error Correction: Reduce the bit error rate of weak signals over long distances and ensure data integrity.
- Frequency hopping/spread spectrum: resistant to electromagnetic interference, compensating for distance attenuation of over 50% in complex environments.
- AES-256 end-to-end encryption: ensures data security without affecting transmission efficiency.
3、 Long distance enhancement technology (coverage extension)
A. Frequency band selection (diffraction and bandwidth balance)
- Main frequency band: 1.2GHz/1.4GHz (UHF/L band), with longer wavelength, stronger diffraction, and smaller Fresnel zone, suitable for 100km+ line of sight transmission.
- Backup/high bandwidth: 5.8GHz, large bandwidth, anti-interference, used for high-definition image transmission; Dual band intelligent switching ensures link stability.
B. Antenna and power optimization
- High gain antenna: airborne omnidirectional (5-8dBi), ground oriented parabolic (23-30dBi), with a line of sight distance that can be extended by an additional 30% -50%.
- Adaptive power control: 0.1-10W dynamic adjustment, balancing coverage, range, and electromagnetic concealment.
- Receiver sensitivity optimization: up to -100~-103dBm, stable reception even under weak signals.
4、 Typical Implementation Plan
A. Airborne self-organizing network radio (ST99/ST96 series)
- Specifications: Lightweight (≤ 400g), 2W emission COFDM+Mesh、 Full IP interface.
- Performance: Air to ground line of sight 50-100km, end-to-end latency<50ms, supports 1080P/4K high-definition image transmission.
2. 100km ultra long distance scheme
- Architecture: Ground station+1-2 relay drones+operational drones, chain mesh network.
- Link: 1.2GHz main link+5.8GHz backup, MIMO+high gain antenna, multi hop relay.
- Metrics 1080P@60fps Delay ≤ 100ms, data rate ≥ 4Mbps, error rate ≤ 10 ⁻⁶.
5、 Key performance and scene matching
6、 Key points for landing
- Node deployment: Relay drone altitude ≥ 1000m, ensuring line of sight and Fresnel zone clearance.
- Frequency band planning: Avoid interference, prioritize long distances of 1.2GHz/1.4GHz, and supplement bandwidth at 5.8GHz.
- Antenna selection: Airborne omnidirectional maneuverability, ground directional gain enhancement.
- Route optimization: Enable dynamic load balancing to avoid single node congestion.
