Multi-access connection method, device and equipment between satellite and Internet of Things terminal equipment

The invention provides a multi-access connection method, device and equipment between a satellite and Internet of Things terminal equipment, and belongs to the technical field of communication. The method comprises the following steps: acquiring equipment information and satellite-ground link information in a coverage range of a low-orbit satellite, and constructing a satellite channel model; a noise variance is initialized, a correlation matrix is initialized to be a unit matrix, and a support vector set is initialized to be a null set; determining a covariance matrix of edge likelihood probability distribution satisfied by the received signal, and determining an estimated value of each diagonal element in a row correlation matrix of the sparse signal; determining contribution data of the diagonal elements to the objective function; selecting candidate elements meeting candidate conditions from all the updated diagonal elements, and updating the support vector set; obtaining a reconstructed target sparse sig