This paper describes the operation principle of deep water anchored mine and the model of the impact principle,then analyzes the error during the attack ,finally gives an example.

It is pointed out that we shall give full consideration to the millisecond delay detonator′s error,design method and checking computation method on seismic wave.

In this paper,to test the performance of meter-band radar handing over to millimeter-wave target seeker through ground fire-control system and midcourse guidance,a new semi-object experiment system for control and guidance is constructed and used to analyze the influences of radar errors on guidance handover,and the results achieved demonstrate the feasibility of the system.

To analyze the pseudo phenomena caused by migration velocity error, the authors of the paper study the depth error between post-stack migration and prestack migration caused by same velocity error, and it is the depth error of migration profile is only related to velocity error and there is not direct relation with methods of depth migration (post-stack migration or prestack migration).

In this paper, the analytic expression of diffraction efficiency corresponding to the mask etch-depth errors is deduced from the scale diffraction theory.

In order to solve the big error problem of depth measurements by a large span cableway, an automatic positioning type cable supporting equipment is equipped on cableway to reduce span or droop extent, so as to reduce depth measurement error.