Edit area algorithm for navigation display of an electronic flig

Details Edit area algorithm for navigation display of an electronic flig Edit area algorithm for navigation display of an electronic flig

1990-10-09

1991-08-20

Lall, Parshotam S.

Boots, shoes, and leggings

364460, 364449, 340995, G08G 112

Patent

active

050419820

ABSTRACT:
In the navigation display of the electronic flight instrument system, the arc mode and Rose Nav mode of a navigation display require computation of parameters for a greater surface (modified Edit) area than the Edit area for each display scale. When the icons representing selected navigational features are included on the navigation display, the retrieved and stored icons can be positioned external to the viewable Edit area. Because access to a dictionary defining the position of the icons is sequential and because the display buffer storage unit from which the screen display is created has a limited capacity, the arc or Rose Nav display can include features in the non-viewable modified Edit area while not including important features in the Edit area. An algorithm is described that determines when a feature with which an icon is associated is in the Edit area and selects the data associated with those features in the Edit area to be stored in the display buffer storage unit. Data associated with features only in the modified Edit area are not stored in the display buffer storage unit. In the arc display mode and the Rose Nav display mode, the display screen can be continuously updated requiring the algorithm to operate with a dynamically changing display.

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patent: 4994974 (1991-02-01), Cummings

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