TY  - BOOK
AU  - Kaplan,Elliott D.
AU  - Hegarty,C.
TI  - Understanding GPS: principles and applications 
SN  - 1580538940 (alk. paper)
PY  - 2006///
CY  - Boston
PB  - Artech House
KW  - Global positioning system
N1  - Includes bibliographical references and index
ER  -