Reduction Requirements for Data Acquired by an Airborne Data Logger

摘要

Methods to be used for reducing data recorded with an airborne magnetic tape recorder, in both analog and digital form, are described. Most of the analog recordi ng uses frequency modulation techniques and the digital recording uses either a special serial format or a parallel format. Digital computer interface equipment, which has been developed to handle the format of the digitally recorded data, is described in detail. Included is a description of a novel electronic flywheel circuit which detects data gaps, used for word and frame synchronization, over a wide range of data rates. The recording of time-of-day in digital form allows for correlation of data reduced at different times. Data recorded in analog form may be readily correlated with data recorded in digital form. Location of any point of interest fox atdos on the recorded tape is simplified by a preset stop facility which allows the analog tape machine to be stopped at any preset time of recording. (Author)