All-Weather, Low-Level Navigation and Implementation of a One-Way Ranging, Range-Range Navigation System.
Semi-annual rept. no. 4 Apr-Oct 71.
OHIO UNIV ATHENS DEPT OF ELECTRICAL ENGINEERING
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A third-generation RF receiver for navigation uses was designed using digitally-tuned superheterodyne techniques. This approach allows more flexibility and stability in tuning and reduced harmonic and crossmodulation distortion providing greater spectral purity of the output waveform. Four approaches are under investigation leading to an optimized state-of-the-art dedicated digital processor whose architecture is structured specifically for navigation tasks. A rate-gyro stabilized flight director was also designed, simulated, and implemented onboard the DC-3 Flying Laboratory and successfully provided anticipatory command information to the pilot for a stored-route flight plan. Flight experiments with the breadboard system have demonstrated position location accuracies of better than 200 feet, for one standard deviation, for 11 independent flights. Investigation of autocorrelation signal processing techniques for elimination of the onboard clock requirement shows that delay-line stabilities of the order of plus or minus 100 picoseconds for range errors of plus or minus 10 feet are required and presently not technically feasible. Author
- Air Navigation and Guidance