VLSI data demodulator for a microwave landing system

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.