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In the tubular structure, the multi-objective strong joint vibration of the barrel, the moving target in the pipe, the reflector and the millimeter-wave interferometer makes the target moving speed curve obtained by the millimeter-wave interferometer test have multiple segments missing, which affects the measurement of the moving target velocity in the pipe . In order to solve this problem, a target speed restoration scheme based on threshold discrimination and particle filter optimization in a large-diameter tubular structure is proposed. The proposed scheme is based on the short-time Fourier transform (STFT) ) For time-frequency analysis, the velocity curve was obtained. The multi-segment loss of the velocity curve was initially repaired by the threshold method, and then the particle filter was used to further repair and optimize the velocity curve. The experimental results show that the proposed method can effectively solve the problem of target speed loss, effectively measure the target speed in large bore tube, and can adapt to radar signals processing at various speed levels.