Iridium/GPS carrier phase positioning and fault detection over wide areas

Mathieu Joerger, Jason Neale, Boris Pervan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Scopus citations

Abstract

The iGPS high-integrity precision navigation system combines carrier phase ranging measurements from GPS and low earth orbit Iridium telecommunication satellites. Large geometry variations generated by fast moving Iridium spacecraft enable the rapid floating estimation of cycle ambiguities. Augmentation of GPS with Iridium satellites also guarantees signal redundancy, which enables fault-detection using carrier phase Receiver Autonomous Integrity Monitoring (RAIM). Over short time periods, the temporal correlation of measurement error sources can be exploited to establish reliable error models, hence relaxing requirements on differential corrections. In this paper, a new ionospheric error model is derived to account for Iridium satellite signals crossing large sections of the sky within short periods of time. Then, a fixed-interval positioning and cycle ambiguity estimation algorithm is introduced to process Iridium and GPS code and carrier-phase observations. A residual-based carrier phase RAIM detection algorithm is described and evaluated against single-satellite step and ramp-type faults of all magnitudes and start-times. Finally, a sensitivity analysis focused on ionosphere-related system design variables (ionospheric error model parameters, code-carrier divergence, single and dual-frequency implementations) explores the potential of iGPS to fulfill some of the most stringent navigation integrity requirements with coverage at continental scales.

Original languageEnglish (US)
Title of host publication22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009
Pages1685-1699
Number of pages15
StatePublished - Dec 1 2009
Externally publishedYes
Event22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009 - Savannah, GA, United States
Duration: Sep 22 2009Sep 25 2009

Publication series

Name22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009
Volume3

Conference

Conference22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009
CountryUnited States
CitySavannah, GA
Period9/22/099/25/09

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems
  • Electrical and Electronic Engineering
  • Communication

Fingerprint Dive into the research topics of 'Iridium/GPS carrier phase positioning and fault detection over wide areas'. Together they form a unique fingerprint.

  • Cite this

    Joerger, M., Neale, J., & Pervan, B. (2009). Iridium/GPS carrier phase positioning and fault detection over wide areas. In 22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009 (pp. 1685-1699). (22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009; Vol. 3).