| Stable platform, which is the important component of CHZ marine gravimeter, provides a stable base-level to the test apparatus of gravity, and is also widely used in the fields of military, geophysical, aerospace for inertial navigation systems and inertial measurement systems.In the absence of reference manuals and resources, to analyze and test the working principle of gravimeter system is same as to explore a "black box". It takes much research time on study of the basic principles. In this thesis, it is discussed in detail the working principle of a stable platform, and a reform method for the original stable platform; with a combinative method of the theoretical analysis and experiment, the function of the interface of the core components of original stable platform, liquid floated gyroscope, is calibrated, and a design of signal converter circuit is made; Instead of the original analog control circuit, the PMAC-based digital control part has more advantages in some aspects, such as maintenance, debugging and application of the system. Moreover, it is easy to achieve more complex control strategy. The new reform method makes full use of the mechanical parts of the original system and the core liquid floated gyroscopes, saves a lot of money, and improves the function of some system performance indicators while it retains the function of the original equipment.The problems from the following aspects are discussed in the thesis:(1) To introduce the development and the present situation about gravimeter, and to provide reference for experiment of stable platform.(2) To ascertain the system of gyroscopes, and to focus on the principle of work of double-degree-of-freedom gyroscopes.(3) To ascertain the source and features of declination signal and to find out the output interface of the angle sensor by experiment. (4) To design the electric circuit of signal detection.(5) To bring forward to the future study of the design for the control system of stable platform.
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