Abstract: A magnetic heading signal simulator that simulates the analog electrical signals representative of magnetic heading produced by a conventional flux value of an aircraft and provides the simulated signals to the magnetic heading reference system of the aircraft for test purposes receives digitally-encoded information representative of a desired value of heading and a rate at which that heading is to be reached. The simulator includes a logic circuit that receives the digital heading information from a programmable digital computer and assembles the heading value information in a form compatible with the input of a digital-to-synchro converter in accordance with the provided rate information. The digital-to-synchro converter decodes the digital information and provides an output simulative of a three-wire synchro signal representative of the desired heading value.

Abstract: Aircraft navigation testing apparatus includes circuitry which produces digital signals on an output bus corresponding to a desired simulation of aircraft glideslope, localizer and very high frequency, omnidirectional (VOR) positions. Localizer and glideslope circuitry respond to the signal on the bus to produce the desired final value signal at the dictated rate. VOR circuitry responds by activating selected switches in a switchbank, thereby programing a conventional VOR generator to produce the VOR signal at the desired rate.