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Wide Area Inverse DGPS For Fleet Operations
| 题名： | Wide Area Inverse DGPS For Fleet Operations |
| 作者： | James W. Bradley; H. Keith Smith; Anil Tiwari |
| 关键词： | Wide Area; Inverse; DGPS; Fleet Operations |
| 摘要： | Noting that fleet tracking was beginning to implement the use of Global Positioning System (GPS) information, and recognizing that such information would require accuracy at a reasonable cost, Differential Corrections Inc. (DCI) developed a wide area Inverse Differential GPS (I-DGPS) product offering. Numerous clients have successfully integrated DCI’s I-DGPS into their fleet/asset tracking and dispatching operations. TechnoCom, who acted as the DGPS system integrator for Teletrac, is one of these clients. This paper describes some of the technical aspects of the I-DGPS, and the integration that TechnoCom performed for Teletrac. Commercial GPS users have leveraged the GPS technology that has been put in place by the U.S. Department of Defense (DoD). Through triangulation from GPS satellites latitude/longitude/elevation position information can be determined anywhere in the world. However, the commercial GPS positions can be off by as much as 100 meters due to the cumulative errors of Selective Availability (SA), ephmeris, ionospheric effects, and tropospheric effects. Knowing that users would require accuracies far better than 100 meters DCI was formed as a company in 1992 to provide differential corrections for commercial users of the GPS system. The first DCI products were Radio Data System (RDS) receivers that plug directly into the users GPS receiver. The I-DGPS product does not require receivers at the GPS units. Corrections are satellite downlinked to the clients control center where they are fed to a computer using Windows 98 or NT, and containing the software that allows for corrections to be applied to thousands of positions coming into the control center from remote vehicles. TechnoCom recognized the accuracy and economies that were applicable for Teletrac. The IDGPS was integrated into the Teletrac system, and performed very well during testing. It is now being rolled out throughout the Teletrac market areas. This integrated system not only provides accurate reliable tracking, but also allows for expanded operational coverage for Teletrac clients. These same benefits are being realized by other users of the DCI I-DGPS service. |
| 总页数： | ITS America. Meeting (9th : 1999 : Washington, D.C..). New thinking in transportation : conference proceedings. 1999. pp10 |
| 报告类型： | 科技报告 |
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