Distance-inertial guidance of launch vehicle described

The basic principle of a distance-inertial guidance system is summarized, the affine coordinate inertial coordinate system is defined, and coordinate transformation is discussed. Simulation and flight test results show that during the boost phase, the accuracy of a distance-inertial guidance system is considerably higher than a pure inertial guidance system with the same inertial components. Since the system requires only simple ranging equipment near the launch site and is only to be used during the boost phase of the launch vehicle, launch preparation is easy and the likelihood of outside interference is very small. Since the pure inertial guidance section and the distance-inertial navigation section are independent of each other, the correction given by the composite navigation is applied after the identification calculation. Introduction of the distance information does not affect the autonomy or the reliability of the inertial guidance system.