Abstract :
The theory of operation, practical applications, and technical performance of a Global Positioning System (GPS) receiver designed for urban area use are explained. Component-level system design choices are shown to support superior automotive vehicle location (AVL) performance, including optimum mobile communications with satellites and ground-based relays. The Humminbird GPS can be viewed as a mobile data system by virtue of its several optimization features for the AVL market. The design-to-cost and design-to-market philosophy behind the Humminbird GPS has resulted in a product uniquely able to satisfy the vehicle location needs of millions of buses, taxis, and cars
