( ( The ( NAVSTAR GPS ) ) ( ( is ( ( a ( space-based ( , ( radio-positioning constellation ) ) ) ) ( of ( ( 24 ( orbiting satellites ) ) ( that ( ( ( provide ( navigation ( and ( timing information ) ) ) ) ( to ( military ( and ( civilian users ) ) ) ) ) worldwide ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP NAVSTAR) (NNP GPS)) (VP (VBZ is) (NP (NP (DT a) (JJ space-based) (, ,) (JJ radio-positioning) (NN constellation)) (PP (IN of) (NP (NP (CD 24) (JJ orbiting) (NNS satellites)) (SBAR (WHNP (WDT that)) (S (VP (VBP provide) (NP (NN navigation) (CC and) (NN timing) (NN information)) (PP (TO to) (NP (JJ military) (CC and) (JJ civilian) (NNS users))) (ADVP (RB worldwide))))))))) (. .)))
The NAVSTAR GPS is a space-based, radio-positioning constellation of 24 orbiting satellites that provide navigation and timing information to military and civilian users worldwide.
(ROOT (S (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT the) (JJ worldwide) (JJ radio-navigation) (NN system)) (VP (VBN formed) (PP (IN from) (NP (NP (DT a) (NN constellation)) (PP (IN of) (NP (CD 24) (NNS satellites))))))))) (CC and) (S (NP (PRP$ their) (NN ground) (NNS stations)) (VP (VBP gps))) (. .)))