and phase, and antenna position errors, while the fine correction is used to correct the residual constant phase, baseline measurement, and range-variant channel phase errors. Aiming at the classical subspace method that requires estimation with Doppler variation, [103] converts the Doppler-variant steering vector to one that is independent of Doppler frequency, so that the steering vector of the entire data is the same, reducing the amount of calculation in the error estimation. In [104], Guo et al. propose a subspace