GNSS cascade adaptive multi-beam forming method

The invention relates to a GNSS cascade adaptive multi-beam forming method and belongs to the field of satellite navigation. The method comprises two parts of whitening processing and beam forming, the whitening processing completes antenna end interference suppression, the beam forming completes receiver end beam forming, and the whitening processing comprises autocorrelation matrix calculation, autocorrelation matrix square root calculation, square root inversion operation and data conversion processing; the beam weighting comprises weight transformation processing and beam weighting. Compared with a traditional GNSS beam forming method, the scheme can separate anti-interference processing from beam weighting, so the anti-interference processing of an antenna end does not need to be assisted by prior information such as satellite direction and antenna attitude, and a receiver end is easy to achieve space, time and frequency three-dimensional integrated searching and tracking; and meanwhile, the autocorrelat