( ( ( ( Global ( Positioning System ) ) ( The ( Global ( Positioning System ) ) ) ) ( -LRB- ( GPS -RRB- ) ) ) ( ( is ( ( a ( world ( wide ( radio-navigation system ) ) ) ) ( formed ( from ( ( a constellation ) ( of ( ( ( 24 satellites ) and ) ( their ( ground stations ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Global) (NNP Positioning) (NNP System)) (NP (DT The) (NNP Global) (NNP Positioning) (NNP System))) (PRN (-LRB- -LRB-) (NP (NNP GPS)) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT a) (NN world) (JJ wide) (NN radio-navigation) (NN system)) (VP (VBN formed) (PP (IN from) (NP (NP (DT a) (NN constellation)) (PP (IN of) (NP (NP (CD 24) (NNS satellites)) (CC and) (NP (PRP$ their) (NN ground) (NNS stations))))))))) (. .)))
Global Positioning System The Global Positioning System (GPS) is a world wide radio-navigation system formed from a constellation of 24 satellites and their ground stations.
(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))) (. .)))