Equal long and short baseline high-precision direction-finding positioning method, system, device and terminal

The invention belongs to the technical field of short baseline positioning, and discloses an equal long and short baseline high-precision direction-finding positioning method, system, equipment and terminal, and the method comprises the steps: carrying out the calculation of array antenna deployment through the ratio of baselines according to the principle of'low first and high second ', and employing a relative phase estimation algorithm to estimate the phase of a multi-channel received signal at a certain moment; a two-stage virtual baseline is constructed, and direction finding is completed in a mode of comparing and verifying measured values of the two virtual baselines by adopting a principle of stage-by-stage ambiguity resolution of an interferometer; and realizing equal-length baseline distance measurement based on a passive phase comparison distance measurement principle and obtaining a target position, and analyzing and processing a target positioning result after monopulse direction-finding distance