Research on Nonlinear Interference Mechanism and Parameter Characterization of Airborne RF Receive

When airborne RF receivers operate in complex electromagnetic environments, their nonlinear characteristics can cause blocking interference, intermodulation interference, and intermodulation interference, seriously affecting system performance. This article is based on a power series expansion of a nonlinear system model, analyzing the 1 dB compression point characteristics when a single tone signal is input, as well as the second-order and third-order intermodulation cutoff point characteristics when a dual tone signal is input, revealing the mechanism of nonlinear interference in the receiver and its impact on signal transmission. This study provides a theoretical basis for the anti-interference design and performance optimization of airborne RF receivers, which is of great significance for improving the reliability and electromagnetic compatibility of avionics systems.