Implementation of Low Complexity Signal Tracking Loop of a GPS Receiver Using CORDIC Algorithm

Abstract

Global Positioning System (GPS) receivers constitute a topic of great importance since they have applications in many fields of science and industry to determine the users position, velocity and time. In order to determine position, GPS receivers needs to know the navigation message which is obtained by demodulating the received signal. Demodulating process requires the local harmonic signal and the received signal to have a phase alignment of relatively high accuracy. In this paper we focus on the digital design of the Signal Tracking Loop of a customized GPS receiver. We present a novel implementation of the Carrier Discriminator used in the signal tracking loop using CORDIC Algorithm which reduces the computational complexity of mathematical operations.