The CTS is an upper stage developed by the China Academy of Launch Vehicle Technology (CALT) to improve the performance of the Long March 2C to high (>400 km of altitude) LEO missions like SSO.
The two stage LM-2 delivers the payload and stage to an elliptical orbit with the desired apogee and the CTS points the stack in the direction of the correct vector and activates the solid rocket motor (SRM) main engine to circularize it.
[6] In 1999, LM-2C User Manual was offered as the CTS option and flew to deploy the Double Star mission.
[8][9] It is composed of the Spacecraft Adapter and Orbital Maneuver System (OMS).
The Spacecraft Adapter is customized to the user's requirement, particularly in the separation environment and pointing accuracy.