For the detection problem caused by the point target broken up into a range-distributed target in the wideband millimeter -wave stepped-frequency radar system,an accumulation detection algorithm based on the processing mode of pickup before detection is proposed.

In view of during excavating the roadway in the low permeability outburst coal seam,the composite index of coal and gas outburst often went beyond and speed of excavation was very slow,the comprehensive outburst prevention technology with deep-hole pre-splitting-control blasting and joint excavation and gas drainage was put forward,and its mechanism was studied at length.