NRL MARK III AIRCRAFT OMEGA RECEIVER.
NAVAL RESEARCH LAB WASHINGTON DC
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Omega is a very-low-frequency radio navigation system characterized by very-long-range capability and relatively high accuracy. The Mark III is the third Omega aircraft receiver equipment designed and developed. It consists of an NRL receiver section and a navigation computer. The Mark III will operate on the 10.2 kiloHertz kHz carrier or the 11-13 kHz carrier or the difference between the two carriers 1.1-13 kHz. The receiver consists of timing and signal processing circuits which supply information derived from transmissions at two frequencies from each of four Omega stations to a navigation computer. The receiver includes antenna couplers for loop and blade antennas, filters to eliminate adjacent channel interference, limiters to suppress impulse noise and provide constant output amplitude from the receiver, conversion of the signal frequencies to an intermediate frequency convenient for the computer, and timing circuits to produce gating waveforms which identify the incoming Omega signals to the computer. The receiver controller contains facilities for synchronization of the receiver timer with the incoming signals and for testing the receiver performance. The computer processes the phase information contained in the signals to provide information useful for navigation. The computer outputs include present position in latitude and longitude, distance and bearing to a destination, and cross-track error which can be coupled to an autopilot. Author
- Air Navigation and Guidance