METHOD FOR DETERMINING NAVIGATIONAL PARAMETERS AND STRAPDOWN INERTIAL NAVIGATION SYSTEM FOR ITS IMPLEMENTATION

摘要

FIELD: physics.;SUBSTANCE: method based on the use of accelerometer signals and angular velocity sensors includes measuring the specific external force vector in the projections on the axis of the instrumental trihedron on board a moving object using accelerometers, calculating the matrix of the guiding cosines between the instrument and navigation trihedrons, recalculating the specific external force vector in the projection on the axis of the navigation trihedron, and integrating these indications for calculating the current velocities and coordinates in the form of a vector of relative linear velocity trihedron axes navigation and position vector, wherein while calculating the matrix of the guiding cosines, the absolute angular velocity of the instrumental trihedron measured by the angular velocity sensors, and the absolute angular velocity of the navigation trihedron, calculated as a function of current calculated velocities and coordinates are used. Based on the input parameters of the current velocities and coordinates, the specific external force vector corresponding to the one measured with accelerometers is calculated in the projections on the axis of the navigation trihedron. The specific external force vector measured in the projections on the axis of the instrumental trihedron is compared with the corresponding specific external force vector calculated in the projections on the axis of the navigation trihedron. As a result, the error in compensating the gravity vector corresponding to the difference in the measured and calculated vectors, and, therefore, the possibility of compensating for the dynamic errors of inertial coordinates and height measurement errors are calculated.;EFFECT: significant increase in the accuracy of the autonomous numbering of navigation parameters.;2 cl, 2 dwg