Research On The Speeding Detection Of Shrapnel And Shock Wave Based On Radar Signal

Fragment and shock wave were all generated at the same time to release energy when the bomb was exploded. Fragment was from broken shell when explosion and scattering around, resulting in damage, While shock wave was formed from the air around the bomb because of the extrusion of the explosion production. So the flying speed of fragment and shock wave have be a mainly indicator of explosive power, and the research of fragment and shock wave has become the focus of weapons, explosives and ballistics science in recent decades.The Doppler radar was first proposed of the Doppler effect. The radar transmitter transmitted a radar signal with a certain frequency, and the reflected signal from radar was received by the radar receiver. Comparing with the time and frequency of transmitted and received wave we can calculate the distance, speed, direction, angel and the other important parameters of the moving target. Because of the high range resolution radar and speed resolution and strong anti-interference ability, radar get researcher's attention from the beginning and have a considerable development. It can be widely used in many area of research, especially in military, and it has a good practical value.The traditional methods of shrapnel and shock wave was compared and summarized in this paper. Then we pointed out the limitations and impossible solved problem in that methods. On this basis, this paper proposed that we can use the radar to test shrapnel and shock wave. According to the research at home and abroad and the theoretical knowledge of radar, this paper given the theoretical basis for using this method and analyzed the simulation result.Because of high resolution radar, this paper looked for the demarcation point between acceleration and deceleration section of the shrapnel and shock wave when we got the reflected wave. There are two methods proposed in this paper, the similarity of spectrum and the similarity of amplitude spectrum area, and this paper given the theoretical analysis and simulation results. The two methods ware compared in amount of calculation and accuracy, and the results showed that the two methods have each advantages and disadvantages.The overall system of radar test and the experimental methods of each structure ware described in this paper. The trend of similarity curve was applied to determining the acceleration curve, and we used the sliding window to detection the deceleration curve. In determining the starting time, the model squaring energy accumulate detection was used. Finally, the whole speed wave curve was drawn.