Micromotion Characteristic Acquisition Based on Wideband Radar Phase

A novel method of precise radial range measurement based on wideband radar phase is presented in this paper for micromotion characteristic acquisition. The advantage of this method is the high precision with root-mean-square error values at subwavelength levels, while its difficulties are phase extraction from wideband radar echoes and resolution of ambiguous phase. After the analysis of the principle of radial range measurement based on radar phase, the method of extracting the Doppler phase from wideband radar echoes is proposed, following a comprehensive technical diagram for micromotion characteristic synthesis based on the wideband radar phase. Some restraint conditions for the resolution of the ambiguous phase are analyzed systematically according to the different characteristics of micromotion and radar parameters. The method provides a more precise tool to acquire the micromotion characteristic than the traditional Doppler frequency methods, and the experiments have shown the performances of wideband radar phase extraction and its ambiguity resolution.