Passive tracking system and method using adaptive LOSL(Line of Sight Link)

The present invention relates to a passive location tracking system and method using an adaptive LOSL. A passive location tracking method using an adaptive LOSL according to the present invention includes: forming a LOSL by transmitting a radio wave signal for detecting a moving object by a plurality of transmission modules; Receiving a radio wave signal transmitted from a plurality of transmission modules by a plurality of reception modules and forming a LOSL together with a plurality of transmission modules; Maintaining only the basic link, which is the minimum link network of the LOSL, when the LOSL is formed by the transmitting / receiving module and is in the standby state for detection of the moving object; Transmitting, by the control unit, a command to the receiving module to cause the base link to change to a first link, the link complexity of which is relatively higher than the base link, when a mobile body is detected on the base link; Changing a link complexity from a first link state to a complex link state higher than a first link when an event occurs in a mobile body while position tracking is being performed in a state changed to a first link by a receiving module; And estimating an intersection point (CP) with respect to the LOSL of the moving object by the control unit in the complex link state, and using the same to track the position (moving path) of the moving object.