Abstract: The software design of “Locked Azimuth-Gimbal and Little Rotation Angle Alignment”is discussed. The software is worked out with Intel 8086 assembly language. Thereby, an utility program has been obtained that will be widely fit for the design of the alignment and navigation of platform inertial navigation system. At the same time, some problems on programming are specially studied, such as calculating the modulation-width pulse number of current applied to gyro torquer, salving differential equation with assembler and compensating the double precision with variational proportionality factor. The test results obtained from an actual inertial navigation are given at the end of this paper.

Key words: platform INS, assembly language, software design