Scope Document contributor contact points Revision history Future work Forward

OGC ® Engineering Report OGC 12-096 Copyright © 2013 Open Geospatial Consortium. 1 OGC ® OWS-9 Engineering Report: Use of SWE Common and SensorML for GPS Messaging 1 Introduction

1.1 Scope

This Engineering Report ER describes the approach and results of an OGC Interoperability Project supported under the OWS-9 Innovation thread. The purpose of this project has been to explore and demonstrate: - the potential for supporting ALL data files and data streams within GPS system using the OGC SWE Common Data standard - the ability to describe GPS processing workflows using the OGC Sensor Model Language SensorML standard - web-enabling the processing and application of corrected GPS data using the OGC Sensor Web Enablement SWE encodings and web services -

1.2 Document contributor contact points

All questions regarding this document should be directed to the editor or the contributors: Name Organization Dr. Mike Botts Botts Innovative Research Inc. mike.bottsbotts-inc.net Alex Robin Sensia Software alex.robinsensiasoftware.com Peter D. Kopcha National Geospatial Intelligence Agency Peter.D.Kopchanga.mil

1.3 Revision history

Date Release Editor Primary clauses modified Description 7252012 Initial draft Botts all Initial draft of the ER 11202012 mid draft Botts Message types Added sections describing format descriptions 2 Copyright © 2013 Open Geospatial Consortium. 01042013 Final draft Botts all Final draft

1.4 Future work

Future efforts in this project are desired to: ฀ Design consistent data models for all message types in the GPS system ฀ Incorporate SWE Common Data readerswriters in the GPSTk processing apps ฀ Create SensorML descriptions for GPSTk apps ฀ Demonstrate on-demand design and execution of SensorML-defined workflows for GPS correction ฀ Demonstrate on-demand precise geolocation of UAVs, ground vehicles, and hand-held sensors using SWE services and encodings

1.5 Forward

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The Open Geospatial Consortium shall not be held responsible for identifying any or all such patent rights. Recipients of this document are requested to submit, with their comments, notification of any relevant patent claims or other intellectual property rights of which they may be aware that might be infringed by any implementation of the standard set forth in this document, and to provide supporting documentation. 2 References The following documents are referenced in this document. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the normative document referred to applies. OGC 06-121r3, OGC ® Web Services Common Standard OGC 08-094r1, OGC ® SWE Common Data Model Encoding Standard OGC 12-000, OGC ® SensorML: Model and XML Encoding Standard In addition to this document, this report includes several XML Schema Document files as specified in Annex A. Copyright © 2013 Open Geospatial Consortium. 3 3 Terms and definitions For the purposes of this report, the definitions specified in Clause 4 of the OWS Common Implementation Standard [OGC 06-121r3] shall apply. In addition, the following terms and definitions apply. 3.1 ephemeris A list of coordinates or variables required to calculate the past, present, or future position of a celestial body, including a satellite. 3.2 Global Positioning System GPS A space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. 3.3 Pseudorange The calculated distance between a GPS satellite and a GPS receiver based on the time difference between when the signal was sent and when it was received. Because there are errors in the measured times, the term “pseudorange” is applied rather than “range”. 4 Abbreviated terms BINEX Binary Exchange format COTS Commercial Off The Shelf EPOCHA Estimation and Prediction of Orbits and Clocks to High Accuracy GPS Global Position System GPSIS Global Positioning System Information Service HDF Hierarchical Data File MSNCC Monitor Station Network Control Center NGA National Geospatial Intelligence Agency NMR Navigation Replacement Message NPAF Near-real time Performance Assessment File NSOF Near-real time Satellite Outage File PAF Performance Assessment File PRED Predicted EphemerisState Vector Data File PSF Prediction Support File SOF Satellite Outage File 4 Copyright © 2013 Open Geospatial Consortium. SensorML Sensor Model Language SWE Sensor Web Enablement 5 Conventions

5.1 UML notation