Principle of harmonic radar system is introduced. Re-triggering DAQ(data acquisition) of harmonic radar’s output
data is studied based on NI(national instruments) M series device. Two re-triggering DAQ methods are presented. Time
sequence of the two DAQ methods is interpreted. Program is provided to re-triggering acquire harmonic radar system’s
output data. Dynamic detecting trail of harmonic radar system installed on hauled vehicle is developed. The trail
validates two DAQ methods. Data is replayed and processed using data processing Program. Some parameters of typical
detecting curve are presented.