Accession Number : AD0523014

Title :   Direct Ranging Loran. Volume I. Flight Test.

Descriptive Note : Final rept. 30 Jun 70-1 Mar 72 on Phase 2,

Corporate Author : TELEDYNE SYSTEMS CO NORTHRIDGE CALIF

Personal Author(s) : Culver,Calvin O. ; Dowell,John A. ; Hautzik,Andrew M.

Report Date : MAY 1972

Pagination or Media Count : 298

Abstract : A Direct Ranging LORAN Navigation System was constructed using a LORAN receiver, an interface unit, a digital computer and a control/display unit. The receiver and system output data were recorded by a digital magnetic recorder, together with time from a precision time code generator. The system was tested during 44 flights of three hours average duration during 1971 and 1972 at Eglin AFB. The C-131B test aircraft was beacon tracked by FPS-16 and MSQ-77 radars on the Eglin test ranges and used a stabilized downward-looking camera for off-range flights. The system data and radar position data were synchronized by 150-millisecond radio tones to permit post-flight evaluation of the system performance. The system digital computer performed real-time direct ranging navigation by implementing partitioned Kalman filters developed by Teledyne Systems. No velocity-aiding was used. A temperature-controlled crystal oscillator was used as the receiver oscillator. A simplified program (DRL-1) and a more complex, fully modeled program (DRL-2) were tested, along with a hyperbolic program operated in parallel for comparison.

Descriptors :   (*LORAN, *COMPUTER PROGRAMS), (*ALGORITHMS, LORAN), LORAN, HYPERBOLIC NAVIGATION, RADIO SIGNALS, NAVIGATION COMPUTERS, INTERFACES, DIGITAL COMPUTERS, MAGNETIC RECORDING SYSTEMS, CRYSTAL OSCILLATORS, ERRORS, RADAR TRACKING, SPECTRUM ANALYZERS, RADIO TRANSMITTERS, REAL TIME, INSTRUMENTATION, SIGNAL-TO-NOISE RATIO, AUTOMATIC, AIRBORNE, AIRCRAFT ANTENNAS, SIMULATION, FLIGHT TESTING

Subject Categories : Computer Programming and Software
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE