Ground mobile observation system for measuring multisurface microwave emissivity

Abstract. Large microwave surface emissivities with a highly heterogeneous distribution and the relatively small hydrometeor signal over land make it challenging to use satellite data retrieve precipitation be assimilated into numerical models. To better understand emissivity surfaces, we designed established ground observation system for in situ of several typical surfaces. The major components include dual-frequency polarized radiometer, mobile platform, auxiliary sensors measure temperature soil moisture; moreover, fields are comprising five different Based on observed from system, preliminarily investigated variations results show that horizontally is more sensitive variability than vertically is: former decreases 0.75 cement increases 0.90 sand bare up 0.97 grass. corresponding polarization difference obvious water (>0.3) (approximately 0.25) but reduces 0.1 0.05 almost 0.01 or close zero grass; this trend similar Tb difference. At elevation angles, horizontally/vertically surfaces obviously increase/slightly decrease increasing angles exhibit opposite water.