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Line 2: ==Method== A [[Modulation Depth Comparison Navigational Aid]] (MDCNA), also known as an Instrument Landing System uses the concept of [[space modulation]] to provide guidance to aircraft when on final approach. A [[Carrier]] and [[Sideband]] CSB, and Sideband Only [[Double-sideband_suppressed-carrier_transmission\|SBO]] signal, transmitted from [[Localizer]] and [[Glidepath]] antennas produce a space modulated signal resulting from the vectorial addition of two or more audio signals that vary according to position of the receiving aircraft. Line 8: This difference is traditionally displayed by the deflection of a moving coil indicator or needle/s on an instrument known as an [[horizontal situation indicator]], HSI. ==See also==

Difference in the depth of modulation: Difference between revisions