# Applied Research of the UAV Illumination Measurement System in Sports Stadiums
## 3 Results  
### System Implementation and Testing  
We have built the illumination acquisition system based on the chosen hardware and the method mentioned above. In the process of building the system, it is necessary to consider the location of the system so that there is no obstruction during the illumination measurement. Therefore, the illumination acquiring system is mounted on the top of the UAV, and it is powered by a 3.7 V, 1800 mAh battery because the illumination acquisition system requires enough power to function properly and to transmit data over long distances. Size and weight should also be taken into account to make the illumination acquisition system be carried on a UAV platform. In the system, the width of the physical hardware is 11 cm, and the length is 17 cm. The physical hardware design is shown in Figure 9.  
Figure 8: LOF algorithm flow chart.  
In order to determine the stability of the illuminance acquisition system during dynamic measurements, in this paper we use the illuminance acquisition system and the SPIC-200 (manufactured by Hangzhou Yuanfang Optoelectronics Co., Ltd., Hangzhou, China) illuminance meter to obtain illuminance separately. The illumination measurement is taken at night in the closed laboratory, the influence of the external light environment on illuminance measurement experiments can be reduced to a minimum. During the experimental process, illuminance values were measured twice for each point using the SPIC-200 illuminance meter and illuminance acquisition module. The illuminance data is shown in Figure 10.  
As is shown in Figure 10, the measurement points were set at 0.5 M intervals starting at the laboratory wall. The blue curve shows the illuminance value measured by the illuminance acquisition module, and the red curve shows the illuminance value measured  
Figure 10: Illuminance values measured by the illumination module and by SPIC-200.  
Figure 9: Physical hardware designed.  
by the SPIC-200 illuminance meter. There is little difference in the illumination value and the root mean square error is 2.45 according to Equation (6).  
\[RMSE=\sqrt{\frac{1}{n}\sum_{i=1}^{n}\left(x_{manual}-x_{SPIC}\right)^{2}} \tag{6}\]  
We also verified the dynamic response of the illuminance acquisition system in the range of 1.5-2 m from the light source by keeping the position of the light source fixed during the experiment. A SPIC-200 illuminance meter was used to measure the illuminance value at 1.5 m, and the maximum value was selected to save among the read values. In the next step, we used the illuminance acquired system to measure the illuminance several times at a distance of 1.5-2 m by way of sliding and recorded the maximum value of each measurement respectively. The error is determined due to dynamic measurements by calculating the interpolation of the two. The details are in Table 1.  
According to the data in the table, the error range for dynamic measurements is between \(-2.27\%\) and \(-0.57\%\). which is within the standard range. Thus, the illuminance acquisition system can meet dynamic illuminance measurement requirements.