Two-frequency glidepath transmitter station for the standardised instrument landing system ILS

摘要

There is provided a two-way Gleitwegsendestation for the standardized ILS, which includes means to monitor the effective far-field course and clearance signals. Signals from the antenna radiator groups (A1 ... A3) located Auskoppelsonden (KS1 KS3 ...) are supplied together with a reference signal to an I / Q converter (IQ). The real and imaginary components of the modulation frequencies supplied by this are subjected to a downstream signal processor (SP) of a Fourier transform, and in the frequency domain with reference values ​​for the bottom reflected portions of the radiated signals by the antennas linked. The resulting far-field equivalent signals are compared with stored reference values. In impermissible deviation, the conversion or shutdown of the system is initiated.