A dual redundant flexible strapdown inertial measurement system

The invention discloses a dual-redundancy flexible strapdown inertial measurement system. According to the invention, redundancy design is conducted on strapdown inertia units. Two groups of flexible strapdown inertial measurement systems are mounted on a rocket body in parallel through a vibration reduction support; each group of flexible strapdown inertial measurement system comprises three dynamically-tuned gyroscopes with two degrees of freedom, four quartz accelerometers, servo loops and I/F change-over circuits; the servo loops are matched with the dynamically-tuned gyroscopes and the quartz accelerometers. The dual-redundancy flexible strapdown inertial measurement system has the advantages as follows: the reliability and precision are increased; the operating requirements of high reliability and precision of manned space flight are met; the vibration reduction support is designed according to structure symmetry and temperature fields; collimation prisms are mounted at the symmetry positions of structures and the temperature fields, so that deformation caused by stress and temperature is efficiently prevented from affecting azimuth deviation.