To investigate the remote detection method of transient electromagnetic signals

the detection method based on adaptive double coupled Duffing oscillators is improved

which is applied to high frequency transient signals. At first

the detection performance of double coupled Duffing oscillators is analyzed. It is found that the system detection sensitivity is weak for high frequency signals and the background noises will disturb the synchronization which leads to mistake in estimating the target signal. Hence

the arithmetic is improved based on the scale transformation and adjusting amplitude of driving force adaptively. The simulation and experiment are conducted to verify the feasibility of the improved arithmetic. The results show that the discharge signal can be detected from the interference of weak narrow-band noise and Gaussian noise with the signal noise ratio（SNR） being –20 d B. When the SNR is greater than –20 d B

the detection probability can reach 90%. And when the SNR is less than –20 d B

the false alarm probability can be controlled within 1%. It is demonstrated that the shortages of double coupled Duffing oscillators can be overcome. By expending the target signal and adjusting amplitude of driving force

the transient electromagnetic signals can be detected from background noises. The research may provide guidance to further study the engineering application of remote detection.