GPS CNAV Civil Capabilities Now Being Tested

June 17, 2013  - By 0 Comments

CNAV-logoU.S. Air Force Space Command is now testing CNAV capabilities on the GPS L2 and L5 signals. The initial CNAV Live-Sky Broadcast began June 15 and will take place until June 29. Civil users and manufacturers are invited to participate.
The GPS Directorate (SMC/GP) is implementing the CNAV (Civil Navigation) Test Program, conducting Live-Sky CNAV testing before deployment of the Next Generation Operational Control System (OCX). CNAV is a capability to be provided by Civil Navigation message types for the purpose of improved GPS navigation through the use of signals L2C and L5.

According to the GPS Directorate, the CNAV Live-Sky testing program will span several years and will evolve to support GPS enterprise and modernized civil navigation performance objectives. Objectives include:

  1. Verify and validate the CNAV requirements specified IS-GPS-200F and IS-GPS-705B.
  2. Facilitate the development of robust IS-compliant L2C and L5 civil receivers.

Below is the latest Notice Advisory about the upcoming test issued to NAVSTAR users. More information can be found in the NAVCEN test plan PDF.


NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2013034 NANU TYPE: GENERAL

*** GENERAL MESSAGE TO ALL GPS USERS ***

The purpose of this notification is to inform users of an upcoming event related to the GPS satellite constellation.  Air Force Space Command will be
testing CNAV capabilities on the GPS L2C and L5 signals on Jdays 2013/166-2013/182.  There are no planned GPS satellite outages or degradations for this activity. L2C and L5 CNAV message testing should be transparent to GPS receivers that do not process L2C or L5 CNAV.  These test events will provide an opportunity for civil users and manufacturers to participate in L2C and L5 evaluation. Details on the test plan are located at the NAVCEN web page. Any military or civil users who encounter user equipment problems during or after testing should contact the applicable POCs identified below as soon as possible.  Aviation users should file reports consistent with FAA-approved procedures. Users are cautioned that L2C and L5 signals are not operational.

*** GENERAL MESSAGE TO ALL GPS USERS ***

POC: CIVILIAN – NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
MILITARY – GPS OPERATIONS CENTER at
HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
COMM 719-567-2541, gpsoperationscenter@us.af.mil,
HTTPS://GPS.AFSPC.AF.MIL
MILITARY ALTERNATE – JOINT SPACE OPERATIONS CENTER, DSN    276-3514,
COMM 805-606-3514, JSPOCCOMBATOPS@VANDENBERG.AF.MILttt

 

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GPS World staff

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