Challenge upon challenge
While the NSPO was thrilled with the successful launch of Formosat-5, their joy didn’t last. The data the satellite sent after its second orbit indicated that the satellite was experiencing difficulties.
Chang is in the habit of calling Formosat-5 “our satellite.” He explains: “Our satellite adjusts its angle to the sun to generate electricity.” But just 100 minutes after its launch, the NSPO team discovered that its power levels were dropping so rapidly that the satellite had switched into its dormant mode.
When the team heard the news, their mood plummeted. NSPO deputy director-general Yu Shiann-jeng even wept, because if Formosat-5 couldn’t detect the sun to generate its own power, the mission and the whole program were done.
“When I returned to Taiwan from the US three days later, they told me they had found the problem. It turned out that two of the satellite’s four reaction wheels had wiring issues, which caused our satellite to return to its ‘phoenix’ mode. This is a protective mode that the satellite puts itself into when it encounters a problem. We borrowed it from Formosat-3’s design.”
Chang says, “Our team is amazing. Since we had written every line of the flight software ourselves, our software engineers were able to look at the original wiring diagram, find the cause of the problem, and resolve the problem from the ground by rewriting the program to correctly control the two miswired reaction wheels.”
Having solved the issue, the control team told him that the experience had left them feeling as if they could take on any problem, no matter how difficult.
John Glenn, the first American astronaut to orbit the Earth, once said that real heroes are people who, when faced with a difficult obstacle, try one more time before giving up. Formosat-5 demonstrated that Taiwan’s space technology is up to the test.
Formosat-5 passes over Taiwan every other day, enabling the satellite operations control center to download images the satellite has captured from all over the globe.