This paper describes research in field of wireless nodes indoor localization and controlling access to wireless network resources. Existing methods implement location based services and optionally allows controlling user access only at the authentication stage. Proposed approach, first of all, is aimed to continuous access control. That is significant in applications where unapproved access zones exist. The aim of this research is to develop an approach for realizing the task of wireless networks access control, using physical coordinates of user. Localization is based on time difference of arrival (TDoA) method and triangulation.