Availability benefit of future dual frequency GPS avionics under strong ionospheric scintillation

Jiwon Seo, Todd Walter, Per Enge

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

6 Citations (Scopus)

Abstract

A Global Positioning System (GPS) receiver may lose carrier tracking lock to the GPS signal under deep and frequent fades due to ionospheric scintillation. The frequent loss of lock observed during a strong scintillation period from the past solar maximum can significantly reduce GPS aviation availability. However, the frequency diversity (L1 and L5 frequencies) from the future GPS is expected to mitigate scintillation impact on GPS aviation. In order to assess its mitigation effectiveness, we propose a way to generate correlated fading processes based on our definition of a correlation coefficient between fading channels. Using the correlated fading process model that we propose, navigation availability of Localizer Performance with Vertical guidance (LPV)-200 during severe scintillation is parametrically studied. We then present results showing that high navigation availability is attainable if a receiver reacquires the lost channel within 1 or 2 seconds. Based on this result, we propose a new performance requirement for the future dual frequency GPS aviation receiver performance standards to guarantee high navigation availability during strong scintillation. strong scintillation are much shorter than 30 s and are actually shorter than 1 s. In order to provide high navigation availability under strong scintillation, we suggest an additional requirement for a future dual frequency MOPS. The new requirement that we propose is, "For satellite signal outages of 1 second or less ... the equipment shall reacquire the satellite within 1 second from the time the signal is reintroduced [17]." If a receiver is propagating its tracking loop for brief outages instead of going through its full reacquisition procedures, it can immediately retrack the lost channel when the signal comes back. Hence, fast reacquisition after a brief outage is technically possible. However, if a receiver performs extensive safety checks before reintroducing the lost channel into position solutions, the reacquisition time can be much longer. Therefore, this new proposal needs to be evaluated against RFI threats as well. This new requirement was proposed at the RTCA Special Committee-159 (GPS) Working Group-2 (GPS/WAAS) Meeting on 24 June 2009.

Original languageEnglish
Title of host publication22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009
Pages884-892
Number of pages9
Publication statusPublished - 2009 Dec 1
Event22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009 - Savannah, GA, United States
Duration: 2009 Sep 222009 Sep 25

Publication series

Name22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009
Volume2

Other

Other22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009
CountryUnited States
CitySavannah, GA
Period09/9/2209/9/25

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Availability benefit of future dual frequency GPS avionics under strong ionospheric scintillation'. Together they form a unique fingerprint.

  • Cite this

    Seo, J., Walter, T., & Enge, P. (2009). Availability benefit of future dual frequency GPS avionics under strong ionospheric scintillation. In 22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009 (pp. 884-892). (22nd International Technical Meeting of the Satellite Division of the Institute of Navigation 2009, ION GNSS 2009; Vol. 2).