Abstract:

The remote control link of unmanned aerial vehicle (UAV) is often cluttered by interference, which results in performance degradation or losing lock. The technologies of multiple input multiple output (MIMO) space time block codes and direct spread are combined to suppress the common interference in the remote control link. The superimposed spread spectrum is presented to eliminate multiple access interference in the fusion technology,combat against narrow-band jamming and avoid deception jamming. The maximum likelihood decoding (MLD) based on the subspace projection of noise is adopted to suppress the noise interference of natural and strong wideband. The disturb deviation of MLD caused by channel estimation deviation is analyzed. Then the pilot modification is set up to reduce the effect of channel estimate error on MLD performance. The theoretical analysis and system simulation show that the scheme has better communication privacy and great robustness which can suppress multi-population interferences. It can provide a scheme for achieving the intelligent anti-jamming of UAV in the future.