Doppler microwave landing system signal simulator

摘要

A signal simulator for artificially providing the Doppler-type signals as they would be sensed by a receiver at any point within the coverage volume of a Doppler-type air navigation beacon. A plurality of voltage controlled phase shifters providing instantaneous phase shifts precisely controlled by a digital programmer, are employed. The device is capable of simulating the complex Doppler Microwave Landing System transmitted beacon signal at any point within the coverage volume for either the azimuth or elevation coordinate functions, and for this purpose, generates a direct commutated signal, a multipath signal of independently controlled Doppler frequency, and reference signals both direct and reflected. The device is particularly useful for bench testing of the airborne Doppler-type navigation equipment normally used with the ground Doppler Microwave Landing System beacon transmitters.