Global Positioning System (GPS) is based on a satellite system. Much
work has been carried out on a non-satellite positioning systems using the
existing Global System of Mobile Communications (GSM) infrastructure.
This leads to a hybrid GPS/GSM positioning systems in the paper. We
purpose to adopt GSM for positioning via an integrated switch design with
fuzzy logic, if GPS lose efficacy. This induces four main research features in this paper: (1) Designs with optimal-based Fourier analyzer to achieve error of GPS decrease is presented. (2)New applications of fuzzy set theory are presented to solve the problem of GPS accuracy. (3)An integrated switch of fuzzy logic is designed for selecting GPS or GSM positioning systems. (4)Discussions on various GSM positioning methods are adopted with different error and location parameters of environment.