Horizontal tracking system of secondary platform

Provided is a horizontal tracking system of a secondary platform. The invention belongs to the technical field of platform dynamic tracking. A first roller assembly, a second roller assembly, a third roller assembly and a fourth roller assembly of the system are installed on the bottom surface of the platform, and the rolling directions of every two adjacent roller assemblies of the first roller assembly, the second roller assembly, the third roller assembly and the fourth roller assembly are perpendicular to each other. An air-cushion platform is arranged on the upper plane of the platform. A gyroscope sensor is arranged on the air-cushion platform. A first laser displacement sensor, a second laser displacement sensor, a third laser displacement sensor, and a fourth laser displacement sensor are uniformly distributed on the platform along the circumference. A method combining distance measurement through the laser displacement sensors and angular velocity measurement through the gyroscope sensor is adopted in the invention. The measuring method is high in precision and simple in structure. The problem that a traditional secondary platform has the defects of poor real-time performance, complex structure and low precision in tracking a six-degrees-of-freedom air-bearing table-orbiter is solved.