A Novel Storage-Period Self-Calibration Method of Missile-Borne SINS With Redundant Configuration

The periodic-calibration of missile borne strap-down inertial navigation system(SINS) is the key to realize missile precision attack, especially for strategic missile. However, the traditional periodic-calibration method can only be realized on the three-axis turntable by disassembly, which affects the fast launch ability. It is urgent to propose a periodic free disassembly self-calibration method for strap-down inertial navigation. The assembly strap-down inertial navigation system can only be sensitive to one-degree-of-freedom rotation in the storage period with the help of the rolling maneuver of the missile. It has so far been thought to be impossible in the absence of bi-axial rotation to realize the self-calibration of missile-borne SINS. In this paper, the skewed six axis redundancy configuration mode for strap-down inertial navigation system and observability optimal allocation method have been proposed to solve the self-calibration problem of strap-down inertial navigation. Multiple calculations of variety configurations are conduct to accomplish the calibration, instead of single calculation in traditional method. Eventually, the hardware-in-the-loop simulations results, including the quantities of calibrated sensors and observability degree of main errors, were superior to traditional calibration method reported so far. The method presented here provides a new perspective to realize self-calibration of missile-borne INS during the storage period in pure strap-down way.