# Embrace the Era of Drones: A New Practical Design Approach to Emergency Rescue Drones
## 5 Results Verification and Analysis  
Hefei Jiaxun Technology Co., Ltd. (Hefei, China) carried out product development for the design scheme. The emergency rescue drone's detailed specifications are as follows. Figure 8: Emergency rescue drone renderings from different angles. Figure 7: Function–behaviour–structure mapping. Weight: 6470 g (with dual batteries). Longest flight time: 55 min. Environmental perception: front, back, left, right, up and down, visual + infrared sensors, six-way obstacle avoidance. Environmental adaptability: IP55 protection, maximum take-off altitude of 7000 m, operating temperature range of \(-20\)\({}^{\circ}\)C to 50 \({}^{\circ}\)C. Maximum wind resistance speed: 12 m/s. Payload capacity: maximum payload of 2.7 kg, fully meeting different operational needs in public safety, inspection, mapping, etc. In terms of intelligent decision-making, the drone can autonomously judge the fire situation and make firefighting decisions. In addition, there are artificial intelligence-based fire rescue command and decision-making methods, including receiving the original fire scene images captured by the firefighting drone and processing the fire scene images to obtain the fire scene image. In terms of autonomous navigation, the drone can achieve autonomous navigation in tunnel environments without satellite signals, accurately locating the fire source and personnel, and quickly deploying rescue equipment or firefighting materials. By using GPS positioning and intelligent navigation technology, it can accurately fly to the fire point. At present, physical products have been sold on the market and have achieved good results. To verify the actual degree of satisfaction of the design scheme for user requirements, a user satisfaction rating scale was established from three dimensions: functionality, appearance and interaction. The system usability scale (SUS) [53] was adopted to compare the user experience desirability test results between the products designed in this paper and those previously designed by the company. The specific test contents are shown in Tables 10 and 11. The user satisfaction rating scale in the above two rating scales is established based on expert review and evaluation. Two types of survey questionnaires were distributed to 200 users each, and 196 and 194 valid questionnaires were collected, respectively. Reliability and validity testing of the questionnaire was carried out, and the scoring criteria were as follows:  
Step 1: Determine the conversion score for each question, which ranges from 0 to 4. For positive questions (odd questions), the conversion value is the original score of the scale minus 1 (\(X_{i}-1\)). For negative (even) questions, the conversion score is 5 minus the original score (\(5-X_{i}\)). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Number** & **Dimension** & **Subject** & **Strongly** & **Dissatisfied** & **Usual** & **Satisfied** & **Strongly** \\ \hline
1 & \
\begin{tabular}{c} Appearance \\ dimension \\ \end{tabular} &
\begin{tabular}{c} Satisfaction to the \\ transportation function \\ Satisfaction to the battery life \\ \end{tabular} & 0 & 1 & 2 & 3 & 4 \\
5 & \
\begin{tabular}{c} Function \\ dimension \\ \end{tabular} &
\begin{tabular}{c} Satisfaction to the data \\ transmission function \\ \end{tabular} & 0 & 1 & 2 & 3 & 4 \\ \hline
7 &
\begin{tabular}{c} Satisfaction to the path \\ planning and navigation system \\ \end{tabular} & 0 & 1 & 2 & 3 & 4 \\ \hline
8 & \
\begin{tabular}{c} Interaction \\ dimension \\ \end{tabular} &
\begin{tabular}{c} Satisfaction to operating system \\ Satisfaction to alarm feedback \\ system \\ \end{tabular} & 0 & 1 & 2 & 3 & 4 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: User satisfaction rating scale. Step 2: The conversion scores of all the items are added and multiplied by 2.5 to obtain the total score of the SUS scale, which ranges from 0 to 100. Step 3: Based on the scoring results, the reliability and validity of the survey questionnaire are calculated.