The inertial navigation system for orbit measurement mainly measures information such as horizontal, vertical, gauge, superelevation (height difference between inner and outer rails on curves), and direction (smoothness of curves) on straight sections of the orbit. The POS series products can provide high-precision data analysis and calculation of parameters such as position (longitude, latitude, and height), velocity (horizontal and vertical), attitude (pitch angle, roll angle, and heading angle), acceleration, time, and trajectory for track detection products, thereby improving the accuracy of track measurement.