Microtremor characteristic extraction method of space debris based on the Qujing incoherent scatter radar observations

The microtremor characteristic is one of the important parameters for the space debris characteristic and target recognition. In order to improve the application of incoherent scattering radar(ISR) in the extraction of space debris micro-motion features, a target micro-motion feature extraction method based on radar is designed, including the correction of range migration, the correction of translational velocity and acceleration residual, the calculation of space-frequency distribution and the inverse Radon transform (IRT), etc. The experimental data from the Qujing incoherent scatter radar are used to verify this method. The results show that the rotation or rolling radius, period, frequency as well as attitude angle variation characteristic of target can be extracted from the ISR echo data, thus helping preliminarily inferring its shape. Both the simulation results and real-data analysis correspond to the predicted scenario in general. These work confirm the feasibility that the ISR can be used to measure the microtremor characteristic of space debris, and also provide one new method for the space debris measurement and target characteristic recognition.