Abstract: To address the challenge of the multichannel SerDes data of the star sensor detector failing to synchronize with the clock, resulting in the inability to acquire image data, a four-step correction algorithm was proposed at the bit, half-word, word, and channel levels. Xilinx Kintex-7 was used as the main control chip. On-chip synchronization and interface expansion resources were utilized to convert single-channel DDR serial inputs into dual-channel SDR parallel inputs to realize synchronous acquisition for 8 channel 12 bit serial outputs with a 540° phase offset. The four-step correction algorithm eliminated the constraint that multichannel SerDes data channels must be strictly aligned with the clock at the output end. The star sensor achieved stable and clear imaging under various operating conditions, and its anti-temperature drift performance was improved.