Instrument Landing System Improvement Program Gradient Clearance Monitor.
Final rept. 1 Jul 71-1 Oct 72,
OHIO UNIV ATHENS DEPT OF ELECTRICAL ENGINEERING
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Selected monitoring techniques to obviate the need for glide slope clearance flight checks have been identified. Of those investigated, the gradient clearance monitor concept appears to be the most promising technique for practical solution to the problem of ascertaining glide slope clearance signal. Feasibility is demonstrated through Fresnel zone commonality analysis and the design, fabrication, and experimental evaluation of the proposed monitor in operation with the null-reference, glide-slope system. The results of the study are reported. Details include the development of three methods for the evaluation of gradient clearance monitor data involving both manual and computer solutions. Flight measurements to verify the monitoring of controlled, system faults have been used to investigate monitor credibility. A preliminary theoretical investigation indicates this monitoring concept is also compatible with sideband-reference and capture-effect systems. Results of this study support the concept of a far-field, environmental, glide-slope monitor. Author
- Air Navigation and Guidance