The LADAR system is a device that generates a depth map using reflected laser range information after irradiating a laser pulse onto a terrain or target. In recent years, it is important to acquire accurate 3D coordinates of target objects with target identification from 3D raw data.1–3 The existing LADAR system does not have the function to calculate the target coordinates, but recently, its coordinate system LADAR is actively researched to find the target coordinates. In order to accurately calculate the target coordinates, accurate position information (GPS) of the LADAR system and distance to the target and angle of the laser are required. Generally, digital magnetic compass (DMC) should be used to obtain accurate angles. However, in a region in strong magnetic fields, DMC cannot guarantee its accuracy and its usage is limited. In this paper, we propose a coordinate calibration system to replace DMC and a method to extract accurate angle information using GPS and encoder for robust target coordinate extraction to the magnetic field variation. As experimental results of the proposed system, it is confirmed that it is a robust system in the magnetic field environment compared with the coordinate system using the existing DMC. This is an improved technique for obtaining accurate target coordinates in various environments. Using the proposed LADAR system, it is possible to construct a smart defense system to extract the precise target latitude and longitude coordinate system and to transmit the information to the associated Missile base and command center.