Multi-epoch variable baseline data processing method based on direct demodulation

The invention discloses a multi-epoch variable baseline data processing method based on direct demodulation. The method comprises the following steps: modeling a single-waveband single observation interference process of a group of baselines; establishing a kernel function representing observation response of a group of telescope systems, and obtaining interference fringes; establishing a relationship between target source distribution and interference fringes by using the kernel function to obtain a group of baseline single-band single-observation modulation equations; modeling the single-band single observation process of the telescope array to obtain a modulation equation of the single-band single observation of the telescope array; obtaining a single-epoch variable-baseline multi-band modulation equation based on a kernel function of a modulation equation of telescope array single observation; based on a single-epoch variable-baseline multi-band modulation equation, a corresponding modulation equation is