Pre-detection recording device for satellite data transmission downlink signal

The invention discloses a pre-detection recording device for a satellite data transmission downlink signal, and relates to pre-detection recording under the abnormal condition of a satellite signal in the field of satellite remote sensing and communication, and reason analysis and troubleshooting and positioning of the abnormal signal can be quickly realized by means of signal playback, data analysis and the like afterwards. According to the invention, the pre-detection data recording at the moment is realized by adopting locking signal unlocking triggering and level signal abrupt change triggering, and the method has the characteristics of 24-hour continuous and uninterrupted automatic detection, automatic triggering and no missing recording, so that manpower and material resources can be greatly saved, and the signal abnormal fault detection and positioning efficiency is improved. 本发明公开了一种卫星数传下行信号的检前记录装置，它涉及卫星遥感、通信领域中的一种用于卫星信号异常情况下的检前记录，可事后通过信号回放、数据分析等手段快速实现异常信号的原因分析和故障排查定位。本发明采用锁定信号失锁触发和电平信号突变触发实现该时刻检前数据记录