Dictionary:Doublet modulation

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{{#category_index:D|doublet modulation}} A phase-modulation scheme. Used to encode the message broadcast in transit satellite navigation. A phase shift of +60° for 2.5 ms (Figure D-23) is followed by a phase shift of –60° so that there is no net phase shift. A bit consists of two such doublets in opposite sense following each other by 5 ms.