## 4 Experiment  
To verify the actual performance of the multi-beam method designed in this paper, experiments are conducted in this section for validation. Figure 14 shows the array antenna used in this experiment. The antenna used in this experiment is a Ku-band multi-beam array antenna developed by SATPRO M&C Tech Co., Ltd. (Xi'an, China). The working frequency range of the antenna is 13.7-14.5 GHz. The typical value for the pointing switching time is 0.3 ms. The azimuth scanning range is 0-360\({}^{\circ}\), and the elevation scanning range is 15-90\({}^{\circ}\). It uses the SPI-RS422 control protocol. Figure 15 shows the experimental site. Location: SATPRO M&C Tech Co., Ltd., Weiyang District, Xi'an, China. Time: 4 August 2022. Weather: Cloudy, 35 \({}^{\circ}\)C. Communication Satellite: YATAI 6D Geosynchronous Satellite. The yaw range of the swing platform was \(-\)15\({}^{\circ}\)-15\({}^{\circ}\). The pitch range of the swing platform was \(-\)15\({}^{\circ}\)-15\({}^{\circ}\). The toll range of the swing platform was \(-\)15\({}^{\circ}\)-15\({}^{\circ}\). The angles of the yaw, pitch, and roll of the swing platform run in a sinusoidal manner with a period of 3 s; the maximum angular velocity is 31.4159\({}^{\circ}\)/s, and the maximum angular acceleration is 65.7974\({}^{\circ}\)/s\({}^{2}\). From reference [27], when the maximum angular velocity is  
Figure 14: The SOTM array antenna in the experiment. Figure 15: Experiment site. greater than 30\({}^{\circ}\)/s or the maximum angular acceleration is greater than 40\({}^{\circ}\)/s\({}^{2}\), the swing platform may be in a high maneuvering state during the experiment. To fully validate the design scheme of this paper, the experiment is divided into the following two experiments:  
Experiment 1: No satellite loss occurred in the SOTM antenna  
In this experiment, the carrier was in a high maneuvering moving state, the SOTM antenna did not lose track of the satellite, and the SOTM communication system ran normally. The conventional single-beam tracking method (referred to as the conventional method in this paper) and the multi-beam method proposed in this paper are compared and tested. Figure 16 illustrates the real-time Automatic Gain Control (AGC) level of the SOTM system when using the multi-beam fast-tracking scheme with the SOTM array antenna designed in this paper, while Figure 17 illustrates the real-time AGC level of the SOTM system when using the conventional scheme. From the perspective of the real-time AGC level of the SOTM antenna, it can be concluded that when the SOTM antenna remains connected to the satellite, even during the high maneuvering motion of the carrier, there is minimal disparity in communication quality between the two approaches. This result indicates that the multi-beam fast-tracking scheme proposed in this paper does not result in worse communication effects than the conventional scheme. Figure 18 illustrates the real-time signal quality of the SOTM system when using the multi-beam fast-tracking scheme with the SOTM array antenna designed in this paper, while Figure 19 illustrates the real-time signal quality of the SOTM system when using the conventional scheme. From the perspective of the real-time signal quality of the SOTM system, it can be concluded that when the SOTM antenna remains connected to the satellite, despite the high maneuvering motion of the carrier, the approach introduced in this paper can attain superior communication quality compared to the conventional scheme; this indicates that the multi-beam fast-tracking scheme proposed in this paper outperforms the conventional scheme. Figure 16: AGC of the multi-beam method in Experiment 1. Figure 20 illustrates the real-time Signal-to-Noise Ratio (SNR) value of the SOTM system when using the multi-beam fast-tracking scheme with the SOTM array antenna designed in this paper, while Figure 21 illustrates the real-time SNR value of the SOTM system when using the conventional scheme.