Revision as of 02:54, 30 September 2007 edit Dawnseeker2000 (talk \| contribs) Autopatrolled, Extended confirmed users, File movers, New page reviewers, Pending changes reviewers, Rollbackers 535,883 edits wikify radio frequency ← Previous edit		Revision as of 23:52, 17 October 2007 edit undo Read-write-services (talk \| contribs) Extended confirmed users 1,881 edits m →Method: added link Next edit →
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. The difference between the two modulation depths produce an error current signal in the airborne receiver. When an aircraft follows the courseline, the difference between the two frequencies is zero percent (0%). The DDM for a Localizer at the outer extremity of the course sector is 15.5% or a current equivalent of 150 microAmperes.

Difference in the depth of modulation: Difference between revisions