A micro-motion measurement method based on wideband radar phase derived ranging

The value of micro-motion measurement has become increasingly prominent in the field of target detection and identification, and micro-motion extraction for target recognition demands radar's ability to get both high range resolution and high Doppler resolution. In this paper, we study on the technology of phase derived ranging (PDR) based on wideband radar. Its sub-millimeter ranging accuracy guarantees to extract target micro-motion features effectively, and on the other hand overcomes the shortcomings of the narrowband micro-Doppler separation technology, such as range glint and its failure to obtain the exact position of micro-motion over complex targets. A series of experiments verify the high-precision ranging capability of the wideband radar whose ranging accuracy can reach 0.1 mm, and the high phase stability of the wideband radar ensure feature measurement of very small amplitude fretting. This method can be applied to the target micro-motion feature inversion, and provides an effective approach for target recognition.