CHINA’S IMPORT AND EXPORT IN THE FIRST TWO MONTHS OF 2011 TOTALED US$495.83 BILLION, UP BY 28.3%.IN DETAIL,THE EXPORT REACHED US$247.47 BILLION,UP BY 21.3%;AND
TOPS (terrain observation by progressive scans) is a recently proposed SAR mode for wide swath acquisition, which aims at achieving the same coverage and resolu