Verification of Microwave Air-Bridging for Sky-Net

The Sky Net project proposes a mobile base transceiver station (BTS) for mobile communication service from airborne. In the preliminary study, a Microwave AirBridging (MAB) system is established on an Ultra-Light Aircraft (ULA) to offer relay mobile communication. In order to maintain sufficient Quality of Service (QoS) data-link, microwave system needs to establish critical Line-of-Sight (LoS) antenna alignment between airborne to ground to assure polarization matching. The proposed GPS-to-GPS tracking algorithm uses GPS and barometric data by considering earth curvature to estimate azimuth and elevation angles for the ground dual-axis tracking mechanism. With high accuracy demand in tracking, all sensor data are pre-calibrated by determining their covariance. An additional Data Variance Filter (DVF) is applied to eliminate the sudden data error and white noise from sensors to avoid mechanism vibration and maintain accurate tracking response to match with ULA flight path. The goal tries to reduce the Bit Error Rate (BER) of MAB to accomplish accurate antenna alignment for microwave transmission in Sky-Net application. Keywords-Antenna Alignment; Microwave Air Bridging; Dynamic Filter; Dual Axis Motor Control.