Study on Continuous Wave Electromagnetic Interference Effect of UAV Data Link

摘要

Data link “front door” coupling is the main reason that leads to the electromagnetic interference of unmanned aerial vehicle (UAV). In order to master the experimental rule of data link in the continuous-wave (CW) electromagnetic environment, this paper takes the L-band data link as the experimental object, analyzes the “field-path” conversion of interference signal theoretically, and conducts the electromagnetic sensitivity (EMS) test by using injection method. The experimental results show that under different working signal intensities, the changing rules of the losing-lock threshold of data link are basically the same, and the data link has sensitive frequency bands in and out of the communication band, among which the main reason for the out-of-band (OOB) interference is the generation of second harmonic interference in the intermediate frequency (IF) processing section.