In　order　to　improve　the　safety　of　spacecraft,　the　research　on　artificial　neural　network　and　digital　twin　technology　based　on,　to　our　best　knowledge,　a　novel　fiber　Bragg　grating　(FBG)　sensor　array　is　proposed　for　intelligent　sensing　monitoring　of　spacecraft　on-orbit　collisions.　Femtosecond　FBG　arrays　were　fabricated　on　the　novel　oxide-doped　fiber　by　point-by-point　writing　technique.　The　femtosecond　FBG　is　analyzed　using　the　time-dependent　perturbation　theory　of　quantum　mechanics.　The　FBG　array　can　achieve　high-temperature　measurement　of　1100　°C　and　large　strain　measurement　of　15000　µε.　The　sensing　arrays　were　deployed　on　the　surface　of　the　spacecraft.　Constructed　the　multi-layer　perceptron　neural　network　structure　and　convolutional　neural　network　structure.　1200　samples　were　trained.　Conducted　model　accuracy　testing.　The　accuracy　rate　is　above　98%,　and　accuracy　verification　has　been　implemented.　The　digital　twin　model　was　designed　based　on　various　data　such　as　strain　and　temperature　of　the　spacecraft　structure　under　impact　monitored　by　FBG　sensors.　A　precise　mapping　has　been　formed　between　the　physical　entities　of　spacecraft　and　digital　twins.　Empower　spacecraft　with　functions　such　as　self-monitoring,　judgment,　and　response.　To　ensure　the　stable　and　safe　operation　of　spacecraft.　©　2024　Optica　Publishing　Group　under　the　terms　of　the　Optica　Open　Access　Publishing　Agreement.