NASA has completed testing of ground stations that will download data to Earth for the Nancy Grace Roman Space Telescope. Antennas in Japan, the USA and Australia managed to receive data at different speeds; The highest tested speed was 500 megabits per second. Such an infrastructure will gain importance when scientific studies begin. Roman is expected to send approximately 1.4 terabytes of data every day; This amount will be the highest daily flow among NASA’s astrophysics missions.
NASA’s September 25 statement states that the first attempt was made on September 7 at the Misasa station of the Japan Aerospace Exploration Agency. The team confirmed that the antenna could receive data at up to 500 megabits per second under favorable conditions. Moreover, there was a typhoon in Japan during the trial. Bad weather led to the planned top speed being tested in difficult conditions.
It was the turn of the White Sands ground station and backup antenna in New Mexico on September 8-11. Both downloaded data at the tested speeds. The final test took place on September 17 at the European Space Agency’s New Norcia station in Western Australia; The system met the highest speed there too. NASA says these three regions will form the main pipeline for Roman’s science data.
The important distinction here is that the completion of antenna testing does not mean that all the results of the telescope’s science program are ready. During the trials, system information such as temperature and power consumption and preliminary image data were transferred. NASA expects regular science studies to begin by early 2027. Today’s news is that the network that will meet this intense flow on the ground is ready.
Rain can make data transfer difficult
Roman operates in the L2 region, approximately 1.5 million kilometers away. At this distance, connecting every data to a single antenna or a single weather station would not be a good option. The fact that stations in Japan, Australia and the USA are located in different geographical conditions both increases access windows and limits the impact of local disruptions such as rainfall.
NASA engineers state that raindrops can scatter or weaken the radio waves used. The system will automatically detect any missing data during the transfer. The copy in the telescope’s internal recording area will then be asked to resend within a few hours. Therefore, a one-time outage does not necessarily mean that a piece of data is lost.
In addition to this network that receives science data, there is also a separate tracking and command infrastructure. NASA’s Deep Space Network stations in California, Spain, and Australia handle critical tracking, telemetry, and command missions. The roles of the different connections should not be confused: the daily target of 1.4 terabytes is related to carrying Roman’s science data to Earth.
Roman’s large sky scans could provide a rich source of data for dark energy, galaxies and exoplanets. To achieve this goal, it is not enough for the telescope to produce images; The data also needs to be delivered to researchers in a reliable way. Tests on three continents show that concrete preparations have been completed on the ground side of this long chain.