Simulation and verification of active cancellation system

In this paper, the expressions of active cancellation signal of the LFM and NLFM are introduced and a simulation model of active cancellation system based on Simulink is investigated. The generation of target echo signal and cancellation signal based on Simulink has been proposed in details. Active cancellation is combined with RCS calculation and detection probability calculation to further measure the effectiveness of the system. The simulation is carried out on a stealth unmanned reconnaissance aircraft RQ-170 and result shows that after active cancellation, the peak of spectrum analyzer has reduced in all azimuths; the omnidirectional RCS has also decreased; the detection probability of all azimuths has dropped under 50% which can be considered as undetectable target.