Mechanism Analysis of the Micro-motion Echo Flashes Tilting Phenomenon of Rotor Targets

In order to investigate the physical mechanism of the flashes tilting in the micro-motion echoes of the rotor targets under near-field detection, this paper analyzed the physical mechanism of the echo flashes tilting phenomenon of rotor targets based on the scattering point model. It establishes precise definitions for near-field and far-field detection conditions applicable to rotor targets. Firstly, a unified echo model of the rotor targets from near-field and far-field is developed. Secondly, we derive the echo expression from the echo model and analyze the physical mechanism of the flashes in near-field and far-field conditions, respectively. Moreover, the paper explicitly examines the phenomenon of flashes tilting in near-field conditions, shedding light on the factors influencing the duration of this occurrence. Building upon these insights, the study defines the conditions for near-field and far-field detection of rotor targets, which, in turn, determine the timing of flash tilting. Finally, to validate the theoretical framework, a meticulous amalgamation of simulations and experimental data is conducted. These research findings hold substantial promise for enhancing the precision of rotor target modeling. This, in turn, offers invaluable theoretical and practical contributions to the realm of rotor target detection and fault analysis.