The feature analysis and extraction of lowaltitude targets based on LTE signal is of great significance for lowaltitude target surveillance and key site protection. One of the core techniques of LTE communication signals is multi carrier orthogonal frequency division multiplexing (OFDM), i.e. Time Division Duplex (TDD) and Frequency Division Duplex (FDD). In this paper, a radar echo model of lowaltitude targets with rotors is established based on FDDOFDM signal, the parameterized expressions of Doppler and microDoppler of target scattering points are derived, and the factors of microDoppler frequency of rotating parts are analyzed. On this basis, the micromotion parameters of the target are extracted by a method consisting of time frequency analysis and Hough transform. The feasibility and the validity of feature extraction of lowaltitude micromotion targets are verified under passive FDDOFDM bistatic radar.