Hardware Design For Cannon Shell Inertial Measurement System Based On Accelerometers

Since V-2 ballistic missile, the first one using inertial guidance system in human history, launched successfully in 1942 by Germany, people have never stopped their paces in developing guided weapons. In the seventies to eighties of the twentieth century, USA and Soviet Union both developed a new-style guided weapon independently—guided cannon shell, which blazed a trail of introducing guidance technique to conventional arms. As for conventional weapons, it's low cost, easy to maintain, flexible to use and consumed heavily; especially when there are multi small targets, cannon shell could be superior to missile in damaging effect, so many countries make precision guided munitions as the primary developing direction of the conventional arms. Compare to that, our country has lagged behind; in order to accelerate army's modernization course and improve the level of conventional arms guidance technique, our government puts forward the idea of developing cannon shell guidance system.Based on Gyro-Free Inertial Navigation theory while revolve about MEMS accelerometer and DSP, this dissertation mainly focuses on the research of Gyro-Free Inertial Measurement Unit for shell flight path measurement-the first step for guidance. Firstly, the text introduces the general circs of guided weapon and the principle of GFIMU theory, then discusses the way, as well as the reason, to design the hardware of the system, which is composed of accelerometer configuration, compensating circuit, signal regulating circuit planning, and signal processing unit designing; thereon is about software design philosophy, including data acquisition, compensation algorithm, digital filter, GFIMU algorithm and data transmission method; during the design procedure, accuracy and speed are fully been considered; Finally, through experiment and analysis we reveal the problems exist in the system and bring forward the corresponding improvements. It has been proved that through these improvements, system performance advances greatly in accuracy, speed and stabilization. These, walk out a surefooted step toward the realization of guided cannon shell.