Laser Gyro Strapdown Inertial Navigation System Data Acquisition Circuit Analysis And Design

Being the main aspect of inertial navigation system, strapdown inertial navigation system (SINS) based on ring laser gyroscope (RLG) has been applied in the refitment of service weapons and the development of new weapons. Along with the improvement of RLG and accelerometer and the coming forth of high speed digital processor, the key technique of SINS is carried out. Then the coming problem is how to gain higher navigation accuracy by using current inertial instrument.In this dissertation, the data collection circuitry of SINS is studied. The influence of data from the inertial measure unit(IMU) to the precision of navigation computing is analyzed. The analysis is taken from two aspects, signal bandwidth curtailment and time delay. First, theory analysis and simulation is carried through for researching one-dimensional motion. Then, three-dimensional motion is simulated to get the influence of time delay to navigation computing, so does the improvement of signal bandwidth to navigation accuracy.The filter composing and time delaying of the data collection circuitry of the inertial navigation system is researched. The frequency character of inertial measure data is analyzed according to the static and dynamic experimental data of the inertial navigation system. Finally, the data collection circuitry of the SINS is redesigned, basing on the analyse in this thesis.