Conventional software frame synchronization methods are inefficient in processing huge continuous data without synchronization words. To improve the processing speed, a real-time synchronization algorithm is proposed based on reverse searching. Satellite data are grouped and searched in the reverse direction to avoid searching for synchronization words in huge continuous invalid data; thus, the frame synchronization speed is improved enormously. The fastest processing speed is up to 15445.9 Mbps when HJ-1C data are tested. This method is presently applied to the HJ-1C quick-look system in remote sensing satellite ground stations.%传统软件帧同步算法在处理不包含同步字的大量连续无效数据时，效率较低，为了提高帧同步处理速度，满足HJ-1C及后续高码率卫星实时处理要求，该文提出一种基于逆向搜索的实时软件帧同步算法，该算法通过数据分组和逆向搜索，避免了对大量连续无效数据的同步字检测，大大提高了帧同步处理速度，HJ-1C 卫星数据最大处理速度可达15445.9 Mbps。目前，该算法已成功应用于遥感卫星地面接收站HJ-1C快视系统中。
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