Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 06-02-2019, 13:28   #1
Registered User

Join Date: Sep 2013
Location: Virginia
Boat: Jeanneau SO469
Posts: 67
GPS Jamming Feb 2019

This was just announced by the US government for pilots that use the same GOS signals as GPS, ADS-B outages
“GPS air navigation and automatic dependent surveillance-broadcast service may be unreliable or unavailable in a vast swath of airspace in the eastern US and the Caribbean during a military exercise involving GPS jamming today through Feb. 10. “
Peeew is offline   Reply With Quote
Old 06-02-2019, 14:18   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2005
Location: Bellingham
Boat: Outbound 44
Posts: 6,707
Re: GPS Jamming Feb 2019

It sounds like this is primarily a degrading of the GPS signal, such as disabling WAAS.
The airlines have an interesting out:
Quote:
Pilots who encounter hazardous interruption of GPS navigation or who have flight-control issues should be aware that they can say the phrase “Stop buzzer” to air traffic control, which initiates the process of interrupting the testing to restore navigation signal reception, Duke said.

During previous GPS-interference events, pilots declared emergencies, but the jamming continued because ATC did not understand that the emergency was related to the GPS interference. According to the Pilot/Controller Glossary, “stop buzzer” is a term used by ATC to request suspension of “electronic attack activity.” Pilots should only use the phrase when communicating with ATC, or over the emergency frequency 121.5 MHz, if a safety-of-flight issue is encountered during a known GPS interference event. Using this unique phrase when experiencing an unsafe condition related to GPS interference will ensure that ATC and the military react appropriately by stopping the jamming, Duke said.

“Pilots should only say ‘stop buzzer’ when something unsafe is occurring that warrants declaring an emergency. They should make sure ATC knows that the emergency is GPS-related and that halting the GPS interference will resolve the emergency,” he said.
https://www.aopa.org/news-and-media/...rference-tests
__________________
Paul
Paul L is online now   Reply With Quote
Old 22-02-2019, 17:33   #3
Registered User
 
flyingfin's Avatar

Join Date: Oct 2016
Location: Cape Haze,FL
Boat: Carver,Cobia,Nacra
Posts: 352
Re: GPS Jamming Feb 2019

SUMMARY:
This notice informs the public that the Space and Missiles Center Global Positioning Systems (GPS) Directorate Engineering (SMC/GPE) Systems Integration Demonstration (SI Demo) team plans to execute a test in February 2019 to investigate legacy receiver week roll-over behavior and analyze any off-nominal behavior exhibited. Additonal details about the test and how interested civil vendors may participate is detailed below.

DATES:
Questionaire due by February 4, 2019.

ADDRESSES:
SMC/GPE, 483 North Aviation Boulevard, El Segundo, CA 90245-2808.

SUPPLEMENTARY INFORMATION:
The Global Positioning System (GPS) week number rollover occurs in the GPS legacy navigation (LNAV) message every 1024 weeks due to the GPS week number being represented by only 10 bits within the LNAV message. The next GPS week number roll over will occur 18 seconds prior to the 0000Z boundary (Coordinated Universal Time) between April 6/7 2019. In most cases, any negative response from a GPS receiver caused by a problem accounting for the 10-bit week number week roll over would likely affect the calendar conversion from GPS time to UTC date/time and could result in the GPS receiver thinking it had jumped backward in time by 1024 weeks to 21/22 August 1999. Many receiver-specific design documents contain requirements that ensure proper handling of a rollover event. However, SMC/GPE does not control, maintain, or even have an awareness of the software and requirements baseline of every GPS receiver in operation. Many performance conditions, especially those in older GPS receivers, may differ from expectations laid out in modernized receiver-specific design documents. It should be noted that the modernized civil navigation (CNAV) signals all utilize a 13-bit week number representation and the use of those CNAV signals can delay potential week number roll-over problems to 5/6 January 2137. Below are a few questions whose answers would help SMC/GPE understand your receiver's expected behavior during the upcoming GPS 10-bit week number roll-over:
flyingfin is offline   Reply With Quote
Reply

Tags
gps

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Advisory: GPS jamming - Eastern Mediterranean and Red Seas Cpt Pat Navigation 2 25-11-2018 08:38
Want to Rent: A monohull in FL. 1 or 2 weeks in Jan/Feb 2019 BozSail Boats For Sale and Wanted 0 24-11-2018 08:37
Family crew available AU/NZ Feb/Mar/Apr 2019 Kaskazi Oceania - Australiana 1 28-10-2018 12:47
Crew Available: Eastern USA- Jan or Feb 2019 OdieNCici Crew Positions: Wanted & Available 0 09-10-2018 13:15
GPS Jamming CarlF Navigation 2 12-07-2011 19:46



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:53.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.