( ( ( ( i ( Global ( Positioning System ) ) ) ( The ( Global ( Positioning System ) ) ) ) ( -LRB- ( GPS -RRB- ) ) ) ( ( is ( ( a constellation ) ( of ( ( ( ( 24 or ) more ) satellites ) ( used ( for ( ( ( navigation and ) precise ) ( geodetic ( position measurements ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP i) (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 constellation)) (PP (IN of) (NP (NP (QP (CD 24) (CC or) (JJR more)) (NNS satellites)) (VP (VBN used) (PP (IN for) (NP (ADJP (JJ navigation) (CC and) (JJ precise)) (JJ geodetic) (NN position) (NNS measurements)))))))) (. .)))
i Global Positioning System The Global Positioning System (GPS) is a constellation of 24 or more satellites 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))) (. .)))