"laser-retroreflector-array" . "Laser Retroreflector Array"^^ . . . . "This passive sensor of JPL is used by a ground laser network (of 10-15 SLR stations) to track the position of the satellite for precision orbit determination (verification of altitude measurements). The mass of LRA is 29 kg; the LRA accuracy depends on laser station characteristics. The LRA is used to calibrate the other location systems on the satellite (DORIS, GPSDR) with a very high degree of precision.\n"^^ . . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid2 . _:genid2 . _:genid2 . _:genid2 . _:genid3 . _:genid3 . _:genid3 . _:genid3 . "106" . "http://database.eohandbook.com/database/instrumentsummary.aspx?instrumentID=106" . . "LRA" . "http://database.eohandbook.com/database/instrumentindex.aspx#L" . . "LRA" . .