| 摘要 |
A system for deriving electrical signals to operate simulated radio and navigation equipment in a fixed-base aircraft trainer in accordance with assumed fixed data and variable flight information. Data associated with the transmitting stations is programmed on punched cards which are inserted in a static card reader and supplied in digital form to other components for operations combining or comparing such data with digital flight data. Signals representing the difference between station and aircraft reference coordinates are provided in digital form, as opposed to the analog signals in all prior forms of such apparatus. These digital signals are then applied to a D/A converter, along with other digital signals representing other navigational information, and commensurate analog voltages are produced and sampled at appropriate times to provide signals for computation in the aircraft trainer radio aids analog computer. The D/A converter is time-shared so that it provides, in addition to the aforementioned analog outputs, a ramp voltage generated in response to an input from a free running digital counter.
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