LONG PERIOD ERROR MODES OF A DOPPLER RADAR/FREE DIRECTIONAL GYRO NAVIGATION SYSTEM

F. C. Sakran, Jr.

Peer Reviewed

Abstract:	Error equations are derived for a self-contained aircraft navigation system comprised of (a) a Janus-mixed doppler radar ground velocity sensor (b) a three-axis gyroscopic reference platform, used as an artificial horizon and untorqued directional gyro, and (c) a computer. Except for dynamic inaccuracies in the indication of the local vertical, the navigation system is dynamically exact. Propagation of error is dependent on aircraft velocity and latitude, and for northerly flight (in the northern hemisphere) the system becomes unstable. However, for flights of short duration and/or at low speeds the system remains usable.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 17, Number 1
Pages:	39 - 46
Cite this article:	Sakran, F. C., Jr.,, "LONG PERIOD ERROR MODES OF A DOPPLER RADAR/FREE DIRECTIONAL GYRO NAVIGATION SYSTEM", NAVIGATION: Journal of The Institute of Navigation, Vol. 17, No. 1, Spring 1970, pp. 39-46.
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