To improve anti-interference ability

anti-interception ability and multiple access capability of UAV telemetry tracking and control link

a new communication method of dual chaotic direct sequence spread spectrum is put forward.Instead of traditional pseudo-random sequence

use chaotic sequences

at transmitting end

the signal is modulated by two different chaotic sequence.At receiving end

the received signal is coherent demodulated by the chaotic sequence

then get the original signal by difference operation.Simulation model is estimated by Matlab

the results show that in the same channel conditions

performance of the system is improved.