# A Multimode Fusion-Based Aviation Communication System
## 4 Application Testing  
The aviation multimodal fusion communication system is designed to meet the requirements of aviation engineering structures and applications. The system uses a stacked structure with reinforcing bars on three main printed boards to improve the structure and meet the vibration and impact requirements of aviation electronic equipment. To prevent electromagnetic interference, appropriate decoupling capacitors are installed on the module to meet the electromagnetic compatibility requirements. The thermal design transfers heat to the case shell using a conduction method. The aviation multi-mode fusion communication airborne terminal is shown in Figure 15, with a host size of 160.0 mm \(\times\) 166.0 mm \(\times\) 78.4 mm and a weight of \(\leq\)2 kg. The average power consumption is 50 W, and the peak power consumption is 90 W. The transmission error rate was found to be 1 \(\times\) 10\({}^{-5}\), and the transmission delay averaged 20 ms. We conducted 20 tests  
Figure 14: Block diagram of the power module composition. under various conditions, including different heights (e.g., 50 m), speeds (e.g., 80 km/h), and distances (e.g., 45 km). These detailed data are now included to provide a thorough understanding of the system's performance. The testing block diagram of the aviation multimode fusion communication system is shown in Figure 16. The system testing environment includes three aviation multimode airborne communication terminals, three network cameras, three regulated power supplies, three sets of upper computer software for airborne terminals, one ground testing equipment, and one set of ground control software. The verification test results are shown in Table 2.  
Figure 16: Aviation multimode fusion communication system testing block diagram. Figure 15: Aviation multimode communication airborne terminal prototype. The aviation multimode fusion communication system is designed to integrate different communication links, such as dedicated ad hoc network communication, 5G public network communication, BeiDou satellite communication, RTK high-precision positioning and navigation, and ADS-B broadcasting. This system offers an extensive satellite-aerial-ground integrated communication network, with various functions such as image and data transmission, remote control, telemetry, high-precision positioning, and aviation situation awareness. Its capabilities make it a valuable asset in the field of aviation communication. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Requirements** & **Communication Link** & **Implemented Functions** \\ \hline \multirow{4}{*}{Image Transmission} & Ad hoc Network Communication Link & Optical payload images and videos are collected from multiple aircraft lenses and transmitted to the ground control center via an ad hoc network link for analysis and display. \\  & & The data collected from all aircraft optical lenses within the coverage range of the base station is transmitted to the ground control center via the public network communication link through the ground public network base station, and the optical payload images and videos are analyzed and displayed. \\ \hline \multirow{4}{*}{Data Transmission} & Ad hoc Network Communication Link & Flight status data is collected from aircraft control computers and transmitted to the ground control center via an ad hoc network link for analysis and display. \\  & & The flight status data from all aircraft control computers that fall within the coverage range of the base station is transmitted to the ground control center via a public network communication link through the ground public network base station. The ground control center then analyzes and displays the flight status data. \\ \cline{2-3}  & BeiDou Satellite Communication Link & The flight status data collected by the aircraft control computer is transmitted to the ground control center via the BeiDou satellite communication link and analyzed and displayed.