Accession Number : AD0020378


Title :   THE APPLICATION OF SOME NONLINEAR TECHNIQUES FOR THE IMPROVEMENT OF AIRCRAFT BEAM FOLLOWING


Descriptive Note : Rept. for 1 Spe 1952-15 Feb 1953


Corporate Author : HONEYWELL INC HOPKINS MN


Personal Author(s) : MARKUSEN, DAVID L ; NORTON, JOHN S ; POMEROY, ORVILLE P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/020378.pdf


Report Date : Feb 1953


Pagination or Media Count : 38


Abstract : The beam-following study was devoted to bracketing improvement and noise reduction. Nonlinear systems in the bracketing-improvement study were investigated in which: (1) the system gain was a nonlinear function of the coupler output, (2) the time constant of the lead network was a function of the distance from the localizer transmitter, and (3) a beam position sensor automatically engaged at the moment the rate signal became larger than the displacement signal. Typical REAC solutions are included. A perception filter characterized as a low-pass filter with a variable cut-off frequency and a controlled limit on the second-derivative of the output was developed in the nonlinear program for minimizing beam-noise effects on the ILS-A/P-A/C control system. Data taken on the REAC are presented as evidence that the performance of passive (RC) integrators in a second-order low-pass filter with limiting on the second derivative of the output is similar to corresponding portion of the perception filter.


Descriptors :   *ANTIAIRCRAFT DEFENSE SYSTEMS , *BEAM RIDER TRAJECTORIES , DISPLACEMENT , RATES , LIMITATIONS , INTEGRATORS , NONLINEAR ANALYSIS , NOISE REDUCTION , FIRE CONTROL SYSTEMS , BEAM STEERING , PERCEPTION , LOW PASS FILTERS


Subject Categories : Antiaircraft Defense Systems
      Fire Control and Bombing Systems


Distribution Statement : APPROVED FOR PUBLIC RELEASE