The GPM team has made up the time lost due to weather delays

After a holiday break, final tests for the Global Precipitation Measurement Core Observatory resumed on Dec. 30, 2013, with alignment measurements. The spacecraft's instruments and components, such as star trackers and thrusters, are attached to the main body in specific configurations. Spacecraft alignment measurement is analogous to alignment for the wheels of a car. The Core Observatory measurements ensure that no parts have shifted during its transportation from the United States to Japan, so they will work as expected.

Global Precipitation Measurement (GPM) is an international satellite mission to provide next-generation observations of rain and snow worldwide every three hours. NASA and the Japanese Aerospace Exploration Agency (JAXA) will launch a “Core” satellite carrying advanced instruments that will set a new standard for precipitation measurements from space. The data they provide will be used to unify precipitation measurements made by an international network of partner satellites to quantify when, where, and how much it rains or snows around the world.

The GPM mission will help advance our understanding of Earth's water and energy cycles, improve the forecasting of extreme events that cause natural disasters, and extend current capabilities of using satellite precipitation information to directly benefit society. The GPM Core Observatory is currently being built at NASA Goddard Space Flight Center in Greenbelt, Md., which is home to a Class 10,000 High Bay Cleanroom.

For the test, small cubes are placed at each part that needs checking and an instrument called a theodolite, similar to a surveyor's instrument, makes exact measurements. Measurements are taken in both the horizontal and vertical orientations of the spacecraft, in order to "see" each cube, and were completed as expected with no problems.

In addition, the GPM team has made up the time lost due to weather delays during the satellite shipment in November. They are currently on schedule for the remainder of testing, which continues with a check of the propulsion system. The GPM Core Observatory is scheduled for launch from JAXA’s Tanegashima Space Center between 1:07 p.m. and 3:07 p.m. EST on Thursday, Feb. 27 (3:07 a.m. to 5:07 a.m. Japan Standard Time on Friday, Feb. 28).