Conventional de-noising methods by threshold filter in wavelet domain do not utilize the correlations of seismic data to remove random noises.

The application of WT approach to seismic data processing has bright future,and hence further research into this field is of great value.

The effect of using conventional KL transform to remove strong energy random noises of seismic data is not very good.

The grounding of automatic instrument system includes mainly protective grounding,signal grounding,shield grounding,intrinsic safety system grounding,electrostatic grounding and lightening stroke-proof grounding.

Signal grounding in electromagnetic compatibility aims to solve signal disturbance,the four ways of signal grounding and decoupling methods of ground loop and subsystem are introduced,and takes the grounding system of electric fast transients immunity test as an example,the solutions to reduce and restrain the disturbance in ground loops are put forward.

It was developed a simulation interface circuit for locomotive monitoring equipment, by sending simulated train speed signal, diesel engine rotation signal, working states of locomotive and ground signals to the locomotive monitoring equipment, implemented it to be used in the train driving simulator, the interface could also be used to test the LKJ-2000 monitoring Equipment’ s working condition.

Aimed at the poor geomagnetic signal with a big interference noise measured in the MR/GPS guidance system, the wavelet filter is designed by the wavelet analysis method.

In order to get flight attitude angles of trajectory correction projectile by geomagnetic sensors,geomagnetic field altitude and its abnormal distribution,the interference of magnetic field of the projectile body and the system noise were analyzed as well as the effect of them on geomagnetic signal.

Automatic collecting and analyzing of seismic-electrical signals;