Abstract: In order to study the systematic errors of MR/GNSS measurement system and improve its measuring frequency, a high-frequency measuring method for the projectile roll angle and angular rate, which is based on the assumptions of small angle-of-attack and single axis rotation, is established by using the flight characteristics of high-spin projectile. The systematic error equations of roll angle and angular rate are derived. The real-time systematic error of this combined measuring system in the global scope is calculated by establishing the simulation model with pitch angle as a variable. The results of 6-DOF exterior ballistic simulation show that the overall roll angle error is less than ±5° and the angular rate error is less than ±5°/s after the region of smaller angle between projectile axis and geomagnetic vector is excluded. In the condition of medium or small launching angle, the roll angle calculation method based on MR/GNSS can meet the needs of high-frequency and high-accuracy roll angle measurement for the high- spin projectile.

Key words: ordnance science and technology, geomagnetic field, GNSS, combined measurement, roll angle, trajectory correction projectile