Abstract: A new dynamic multitarget track initiation algorithm for two direction-finding location systems was presented:a part of false intersection points were first eliminated by some heuristic rules, then all straight tracks were detected by Hough transform, and the true tracks were finally initiated by logic-based methods. Its high efficiency is confirmed by simulations in real complex environment where exist false alarms, missed detections and an unknown number of targets. At the end, the method of extending the presented algorithm from two-observation systems to multi-observation systems was introduced and then the NP-complete problem of associating measurements from multiple passive sensors is avoided.