Citation
Abstract
Predetection recording of spacecraft telemetry data allows for possible future analysis of data records in the event of failures of transmitted signals. Dropouts occurring in the playback process necessarily cause loss of information and, more importantly, loss of time synchronization with the remaining data. The object of this study is to show that, with proper digital handling of a timing signal initially recorded along with telemetry data using a device incorporating a proposed digital dropout detector, time synchronization can be maintained throughout dropouts of lengths less than 100 ms, within some small probability of error. Uses extend to recording of planetary entry low-rate and very long baseline interferometry data and, in particular, to planetary radio occultation information, which is already recorded with a timing signal on the same tape track.
Details
- Volume
- IX
- Published
- June 15, 1972
- Pages
- 115–118
- File Size
- 401.6 KB