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Line 4: 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 wave\|carrier]] and [[sideband]] (CSB), and [[Double-sideband suppressed-carrier transmission\|sideband only]] (SBO) signal, transmitted from [[Instrument landing system localizer\|localizer]] and [[~~glidepath~~Instrument landing system glide path\|glide path]] 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. The difference between the two modulation depths produce an error current signal in the airborne receiver. When an aircraft follows the course line, the difference between the two frequencies is zero. This difference is conventionally displayed by the deflection of a moving coil indicator or needle on an instrument known as a [[horizontal situation indicator]] (HSI). Line 10: ==See also== [[Amplitude modulation]] [[Instrument landing system]] [[International Civil Aviation Organization]] (ICAO) [[Radio navigation]] * [[Space modulation]] ==References==

Difference in the depth of modulation: Difference between revisions