Read e-book online Aircraft Navigation (transl. from Russian) [NASA TT F-524] PDF

By S. Fedchin

NASA Technical Translation. Translation of «Самолетовождение», Москва, 1966.

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Additional info for Aircraft Navigation (transl. from Russian) [NASA TT F-524]

Sample text

S i n c e m # n a n d mn # 1, t h e p r o ­ j e c t i o n i s n o t i s o g o n a l and n o t e q u a l l y l a r g e , e x c e p t f o r t h e equa­ t o r i a l band i n t h e l i m i t s from 0 t o + 5 O a l o n g t h e l a t i t u d e , where it i s p r a c t i c a l l y p o s s i b l e t o c o n s i d e r i t i s o g o n a l and e q u a l l y l a r g e . Maps i n n o r m a l ( e q u i v a l e n t ) a n d s i m p l e , e q u a l l y d i s t a n t c y l i n ­ maps d r i c a l p r o j e c t i o n s are u s e d i n a v i a t i o n o n l y as r e f e r e n c e s : o f h o u r z o n e s , maps o f n a t u r a l l i g h t , e t c .

I n t h i s case, t h e c o o r d i n a t e s 37 o f t h e p o s i t i o n o f t h e a i r c r a f t a r e v e r y e a s i l y d e f i n e d as t h e i n ­ t e r s e c t i o n o f t w o s t r a i g h t orthodrome b e a r i n g s ( l i n e s ) extended from t h e radiogoniometers. Maps o f t h e d i f f e r e n t i a l r a n g e f i n d i n g ( h y p e r b o l i c ) s y s t e m o f l o n g - r a n g e n a v i g a t i o n ( D S L N - 1 ) a r e made o n s u c h a p r o j e c t i o n , s i n c e t h e s p h e r i c a l h y p e r b o l a on t h e p r o j e c t i o n i s a l s o e x p r e s s e d by a hyperbola.

Division of Projections b y the Nature of the Distortions The c h o i c e o f c a r t o g r a p h i c p r o j e c t i o n s d e p e n d s on t h e p r o b l e m s f o r whose s o l u t i o n t h e y a r e i n t e n d e d . According t o t h e n a t u r e of t h e e l e m e n t s w h i c h h a v e t h e l e a s t d i s t o r t i o n on a map, c a r t o g r a p h i c projections are divided i n t o t h e following groups: 1. Isogonal o r conformal p r o j e c t i o n s These p r o j e c t i o n s must s a t i s f y t h e r e q u i r e m e n t o f e q u a l i t y o f a n g l e s and s i m i l a r i t y o f f i g u r e s ( c o n f o r m a b i l i t y ) w i t h i n t h e l i m i t s o f u n i t areas of t h e E a r t h ' s s u r f a c e , i .

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Aircraft Navigation (transl. from Russian) [NASA TT F-524] by S. Fedchin


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