Strapdown Navigation Algorithms Implemented in the Inertial and Geographic Frames.
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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This Canadian report presents two strapdown navigation software processing algorithms, one implemented in the inertial frame and the other in the local-level geographic frame. The presentation includes derivation of various mechanization equations to obtain positional and navigational information from input data provided by three gyros and accelerometers. Directional cosine matrix and quaternion update procedures together with initialization schemes are also presented. In the inertial frame implementation a new exact algorithm was derived to transform inertially referenced data into geographic coordinates. Simulation results of a C-141 race-track flight profile are presented to indicate the level of performance accuracy for the above two processing algorithms. Complete listings of software programs are also presented in the Appendices. Originator-supplied keywords include Geographical computational frame, and Inertial navigation frame.
- Air Navigation and Guidance