( ( G ( PS ( T ( IME S ) ) ) ) ( ( ERIES ( ( ( The ( Global ( Positioning System ) ) ) ( -LRB- ( GPS -RRB- ) ) ) ( is ( ( a constellation ) ( of ( ( 24 satellites ) ( which ( is ( used ( for ( ( ( navigation and ) precise ) ( geodetic ( position measurements ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP G) (NNP PS) (NNP T) (NNP IME) (NNP S)) (VP (VBZ ERIES) (SBAR (S (NP (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 constellation)) (PP (IN of) (NP (NP (CD 24) (NNS satellites)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN used) (PP (IN for) (NP (ADJP (JJ navigation) (CC and) (JJ precise)) (JJ geodetic) (NN position) (NNS measurements)))))))))))))) (. .)))
G PS T IME S ERIES The Global Positioning System (GPS) is a constellation of 24 satellites which is used for navigation and precise geodetic position measurements.
(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))) (. .)))