TY - Journal of Arid Meteorology A1 - XU  Yan T1 - Applica tion of Ka lman Filter in Prec ip ita tion Estima tion by Radar Y1 - 2008-03-31 JF - Journal of Arid Meteorology JO - Journal of Arid Meteorology SP - 78 EP - 82 VL - 26 IS - 1 UR - http://www.ghqx.org.cn N1 - ER -