Derivation of Groundspeed Information from Airborne Distance Measuring Equipment (DME) Interrogators.

摘要

Laboratory and flight tests were conducted to investigate the derivation of aircraft groundspeed from the range rate pulse information obtained from ARINC 568 distance measuring equipment (DME) interrogators. Initial tests determined the limitation of the range rate pulse output from the two interrogaters tested. Subsequent effort was directed toward digital filtering techniques to improve accuracy and response time of the DME-derived groundspeed. Best results were obtained with either accelerometer complementation or Kalman filtering with velocity and acceleration observations. Both techniques achieved standard deviations of about 3 knots when compared to Inertial Navigation System (INS) groundspeed. (Author)