1. A method for indoor localization using nomadic access points, comprising the following steps: a target object transmitting a modulated signal over wireless channels to nearby access points, wherein the access points comprise both static access points and nomadic access points; the access points measuring channel state information via the modulated signal from the target object, after that, the static access points exporting the channel state information to a server, the nomadic access points reporting the channel state information along with current coordinates of the nomadic access points to the server; and based on the channel state information, the server determining the target object's relative proximity to two arbitrary access points, then based on a result of the relative proximity determination and coordinates of both the static access points and the nomadic access points, the server estimating a feasible region for the target object by using a space partition-based algorithm.