In order to reduce the volume and power consumption and improve the tracking accuracy, a small airborne fine tracking system with FPGA based on the characteristics of airborne platform vibration power spectral density was desighed and developed. To verify the fine tracking system ability, simulation tracking and disturbance rejection experiments, far-field beacon detection and communication experiments were carried out, the airborne platform vibration suppressed effect and turbulence impact on fine tracking in various intensity were analyzed. In 3.4km far-field atmospheric turbulence experiment, a aircraft to ground communication through angular velocity was simulated.Simulation distance was about 20~30 km and flight speed was about 700 ~ 900 km/h. The experimental results show that, the fine tracking system has strong rejection effect on airborne platform vibration, the tracking accuracy is about 3 μrad. The receiving signal power can be improved 4~5.9 dB in simulated aircraft to ground communication experiment. The fine tracking system has the characteristics of flexibility and high accuracy.