Abstract
THE COMPOSITION of a self-contained navigation system is discussed. It is shown that the over-all accuracy of the system is dependent on the accuracy of its major components, the velocity sensor, the computer, and the heading reference, and can be no better than that of its poorest component. A method of determining the position error of Doppler navigation systems is described which is based on the component errors and on statistical considerations. Sample calculations for four typical systems are presented. The maximum (95% probability) position errors are found to range from 0.54 to 3.24% of distance traveled for the systems selected. The historical behavioral performance of the three major components of a Doppler navigation system are analyzed and presented graphically. The weight trends of the components of Doppler navigation systems and of the complete systems are described. Possibilities of certain combinations of self-contained and ground-referenced navigation systems are discussed.
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