2results about How to "Reduce Mismatch Problems" patented technology

The application discloses a planar array FDA-MIMO radar main lobe interference suppression method, and the Capon technology is used to estimate target signal power to dynamically adjust a DL loading factor; based on eigenvalue distribution of a sample covariance matrix, an adaptive subspace dimension selection strategy is introduced to balance robustness and main lobe suppression performance under different mismatch conditions; the beamformer can adjust the projection subspace and the diagonal loading coefficient according to actual conditions, and can solve the mismatch problem of the steering vector caused by the distance-angle error, the array element position error, the frequency offset and the coherent local scattering, effectively suppress the main lobe interference while improving the beam robustness, obtain better SINR performance, and has wide application value and promotion prospect.

The invention discloses a method for epitaxial growth of a perovskite single crystal heterojunction. According to the method, a saturated acid solution of a specific solute is selected, heteroepitaxy is carried out on different types of perovskite layers, a perovskite lattice structure of a mother layer on the surface of a substrate is flexibly changed, the problem of lattice mismatch caused by lattice mutation at a heterojunction due to heteroepitaxy is solved, the defect density of a material at the heterojunction is reduced, and the performance of the device is improved. The heteroepitaxy yield is improved, and the epitaxial growth crystal quality of the perovskite material is improved. The method comprises the following specific steps: putting a perovskite substrate into a specific saturated acid solution, cooling to separate out crystals, and carrying out heteroepitaxial growth. According to the method, the heteroepitaxy yield of the perovskite material is remarkably improved, the heterojunction defect density is reduced, and the method has wide application potential.