The technique of MMW active/passive combined detection can greatly improve the performance of target identification and angle orientation by combining MMW radiometer with radar, so that it can fully makes use of the dispersion characteristic and the radiation characteristic of target.Key performance of MMW radiometer and radar with different work band in the 3mm MMW detecting system are analyzed in detail and some important parameters are set. Also the designing process of pulse modulator, intermediate frequency amplifier, video frequency amplifier and analog filter is introduced in the dissertation.Relationship between MMW passive echo and detecting conditions including target character, background of target and detecting mode is analyzed and basic arithmetic of target identification is brought forward. Characteristics of active echo and arithmetic of active target identification are researched on the basis of passive echo analysis. Signal process modules for target distance measure and target identification are successfully designed with DSP processor and MCU. |