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The Use of Composite Omega and the 3.4 kHz Difference Frequency for Aircraft Navigation.

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Final rept.,

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The Federal Aviation Administration FAA furnished the National Hurricane Research Laboratory with an Omega aircraft receiving system which was manufactured by Tracor, Inc. This system was installed in a hurricane watch aircraft operating out of Miami, Flordia. FAA was interested in obtaining data on the usefulness of Composite Omega and the uncorrected difference frequency 3.4 kHz for aircraft navigation. The Naval Research Laboratory NRL was requested by FAA to recommend procedures for obtaining data and methods for data reduction. Data was to be collected on routine flights and reduced by the National Hurricane Research Laboratory and then sent to NRL for analysis. Results that were submitted show extremely large errors in position that could only have been caused by receiver malfunctions or in the data reduction. Therefore no significant conclusions could be drawn from the information that was submitted. Since the main purpose of the study was not achievable it was felt that fixed site data could also be used to evaluate the composite Omega concept. However, whithin the funds available only a limited amount of fixed data could be analyzed and therefore the results are not conclusive. The limited data show no significant improvement in the errors due to diurnal variations of composite Omega over the 3.4 kHz difference frequency. The data did show however that the fluctuations due to noise were reduced by the composite Omega method over what was shown by the 3.4 kHz difference frequency data. Author

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  • Air Navigation and Guidance

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