The Application of Some Nonlinear Techniques for the Improvement of Aircraft Beam Following
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Report Number: WADC TR 53-74
Author(s): Markusen, David L., Norton, John S., Pomeroy, Orville P.
Corporate Author(s): Honeywell, Inc.
Date of Publication: 1953-02
Pages: 38
DoD Task:
Identifier: AD0020378
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.
Author(s): Markusen, David L., Norton, John S., Pomeroy, Orville P.
Corporate Author(s): Honeywell, Inc.
Date of Publication: 1953-02
Pages: 38
DoD Task:
Identifier: AD0020378
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.