Abstract: When radar transmits the narrowband signal to the cone-shaped target, the modulation induced by precession causes the periodic change of scattering centers Instantaneous Frequency (IF) contained in echo, which can reflect the targets geometry and structure characteristics. Aiming at this, a parameter estimation method for space cone-shaped target is proposed based on narrowband micro-Doppler modulation. First, the scattering properties of the cone-shaped target are analyzed, and the scattering centers IF variation formulas caused by precession are derived. Then, the Time-Varying AutoRegressive (TVAR) model is utilized to estimate the IF variations from the narrowband echoes of the cone-shaped target, and reassociation is implemented to fix the estimation errors. Finally, based on the properties of the IF variations of the top and bottom scattering centers and the trajectory, the target geometry and micro-motion parameters are estimated. Experiments based on the electromagnetic computation data verify the validness and accuracy of the proposed method.