Abstract
A VLSI circuit for demodulating the microwave landing system data format is presented. The approach is based on a second- order all-digital phase locked loop. The primary goal of the work is to find a cost effective way of embedding the demodulator within an integrated navigation receiver built around a customised application specific processor (ASP). While the fully digital nature of the design increases the demodulator's immunity to analogue-related problems, the dedicated hardware approach relieves the ASP from computationally complex tasks, such as carrier acquisition and clock synchronisation.
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