Offshore operations encompass a range of activities including marine resource exploration, offshore engineering maintenance, coastal fisheries regulation, maritime emergency search and rescue, and environmental monitoring. In waters within 30–50 km of the coast, operators commonly face challenges such as weak 4G/5G public network signals, strong multipath interference on the sea surface, vessel heaving, and the absence of fixed communication base stations.

This offshore operation project utilizes DJHW/HZ-33-100M-C broadband MESH self-organizing network equipment to establish a three-dimensional networking architecture comprising one fixed-wing drone, 3–4 offshore operational vessels, and a shore-based command center. The network coverage radius ranges from 30 to 50 km. Leveraging the MESH's decentralized multi-hop self-organizing capability, it enables full-chain communication across air, sea surface, and land domains, supporting bidirectional real-time transmission of high-definition video feeds, Beidou positioning data, operational information, and group intercom signals—making it perfectly suited for large-scale collaborative communication requirements in offshore environments.

l Airborne Layer:

 Fixed-wing UAV airborne node (DJHW/HZ-33-100M-C Sky Unit)

The fixed-wing drone is equipped with the DJHW/HZ-33-100M-C airborne sky-end device, serving as a core high-altitude relay hub for the entire network. The device is lightweight and mounted directly onto the drone's fuselage, complemented by an omnidirectional fiberglass-reinforced plastic antenna. Leveraging its operational advantage at hundreds of meters above sea level and avoiding obstruction from surface obstacles, it can cover a surrounding maritime area of up to 50 km in a single flight. An onboard electro-optical pod captures high-definition video footage of comprehensive marine patrols along with images of sea topography and environment, while also handling video encoding and transmission. Additionally, functioning as an aerial relay, it forwards data transmitted from various ship-based nodes; long-distance links are prioritized via drone mid-air relaying to ground-based stations, addressing communication challenges between vessels and land-based facilities beyond line-of-sight ranges.

l Sea surface layer: 

Each of the 3–4 operational vessels is equipped with a DJHW/HZ-33-100M-C airborne node (one unit per vessel). 

A separate DJHW/HZ-33-100M-C airborne node is deployed on each offshore vessel, featuring full salt spray resistance (IP67 rating) and designed for harsh marine conditions including high humidity, salt corrosion, and strong wind disturbances. Vessel interconnection: The 3–4 vessels serve as relay nodes, autonomously establishing a MESH network between them; routes automatically switch when vessel spacing changes or local obstructions occur, while remaining nodes rapidly self-heal upon loss of contact with any vessel.

Multi-path data transmission: Ship data can be directly transmitted to drone-based aerial nodes and then relayed to the shore-based command center; for short distances, it can also undergo multi-hop routing to establish a direct link with the shore-based ground terminal, ensuring uninterrupted operation through dual-link redundancy. The system integrates onboard multi-camera surveillance systems, Beidou positioning terminals, sensor acquisition devices, and trunked communication radios to transmit real-time operational data from engine rooms, deck operations, and ship's GPS coordinates, enabling comprehensive crew communication and dispatch coordination across multiple vessels.

l Land Layer: 

The ground receiving node at the command building (one unit of DJHW/HZ-33-100M-C) features this equipment installed at the highest point on the roof of the shore-based command building, paired with a high-gain omnidirectional/ directional combined antenna, serving as the centralized land data hub for the entire system. It aggregates 1080P high-definition video feeds, navigation parameters, and environmental monitoring data transmitted from fixed-wing drones and all maritime vessels, transmitting them via a Gigabit network interface to the command center's display screen and server storage system. Command personnel issue operation schedules, inspection tasks, and emergency response instructions, which are simultaneously distributed to airborne drones and all maritime vessels through the MESH network, enabling integrated remote control across land, sea, and air domains. The ground unit is equipped with dedicated network ports that allow external connection of 4G-CPEs or satellite terminals as backup links; in cases of limited connectivity due to extreme weather conditions, it automatically switches to alternative links.

The DJHW/HZ-33-100M-C maritime-air network solution can be rapidly deployed across various applications, including offshore wind power maintenance fleets, coastal fisheries enforcement, offshore oil exploration, marine environmental monitoring, and maritime emergency rescue operations. Subsequently, additional operational vessels or inspection drone nodes can be added as needed, with seamless one-click device networking and flexible scalability for network expansion.