Browse Prior Art Database

USE OF PAGING SYSTEM INFRASTRUCTURE TO BROADCAST REAL TIME DIFFERENTIAL GPS CORRECTION DATA

IP.com Disclosure Number: IPCOM000006533D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-11
Document File: 2 page(s) / 85K

Publishing Venue

Motorola

Related People

Chris Moyer: AUTHOR

Abstract

The Global Positioning System (GPS) is a network of satellites owned and operated by the Department of Defense. The GPS satellites are used for worldwide nav- igation and surveying. The accuracy of this system for commercial users is 15-100 Meters (using a single auton- omous GPS receiver).

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 2

MOTOROLA INC. Technical Developments Volume 16 August 1992

USE OF PAGING SYSTEM INFRASTRUCTURE TO BROADCAST REAL TIME DIFFERENTIAL GPS CORRECTION DATA

by Chris Moyer

INTRODUCTION

  The Global Positioning System (GPS) is a network of satellites owned and operated by the Department of Defense. The GPS satellites are used for worldwide nav- igation and surveying. The accuracy of this system for commercial users is 15-100 Meters (using a single auton- omous GPS receiver).

  Accuracy can be greatly improved by providing a differential correction signal from a known reference (via RF data link) to single autonomous receiver. This now allows the autonomous receiver user to enjoy accuracies of l-5 Meters.

  Differential correction is an industry standard method to increase GPS positional accuracy. This discussion deals with a unique method of distributing this data on existing infrastructures.

PROBLEM

  The user community requires reliable real time dii- ferential correction data available 24 hours a day through- out the operational area.

SOLUTION

  The differential correction data can be broadcast uti- lizing current wide coverage area Paging system infra- strutires. Referring to Figure 1, a GPS receiver is added to an existing paging base station (where its location has been surveyed to known geographical coordinates). This

GPS receiver acts as the reference receiver which meas- ures and calculates errors from the GPS satellites based on its known position. The GPS reference rec...