Accession Number : AD0713420

Title :   ALL-WEATHER, LOW-LEVEL NAVIGATION.

Descriptive Note : Semi-annual rept. no. 1, Oct 69-Apr 70.

Corporate Author : OHIO UNIV ATHENS DEPT OF ELECTRICAL ENGINEERING

Report Date : SEP 1970

Pagination or Media Count : 33

Abstract : The multifaceted work associated with the early phases of the Ohio University Themis project has gradually been consolidated into the broad areas of receiver and computer technology as applied to producing the All-Weather, Low-Level Navigation System. The design and breadboarding of a tuned radio frequency (TRF) receiver has been completed. Results of laboratory tests of the TRF breadboard indicate the receiver is phase-stable to within one electrical degree; its design objective. Effort on the maximum likelihood estimator (MLE) has been divided into two efforts. First, verification of earlier theoretical investigation comparing phase-locked loop and MLE receiver structures was accomplished. Second, refinements in the physical realization of the MLE were achieved and a brassboard design frozen. The airborne reference frequency synthesizer has been designed and is being fabricated. In addition, precision stability measurements are being accomplished on a new crystal standard to ascertain its suitability for future airborne use. Work continues in the area of system integration and analysis, particularly in the application of Kalman filtering techniques for estimating position accurately and in the broad area of man-machine relationships required in the low-level, all-weather navigation system. (Author)

Descriptors :   *ALL WEATHER AVIATION, *NAVIGATION COMPUTERS, SYSTEMS ENGINEERING, POSITION FINDING, LOW ALTITUDE, RADIO RECEIVERS, FREQUENCY SYNTHESIZERS, DISPLAY SYSTEMS, GROUND POSITION INDICATORS, FLIGHT SIMULATORS, COMPUTERS.

Subject Categories : Air Navigation and Guidance
      Commercial and General Aviation
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE