Welcome Guest. Sign in or Signup

2 Answers

GPS RAIM

Asked by: 4826 views Airspace, FAA Regulations

I am somewhat confused with RAIM regarding WAAS GPS navigators and IFR approved non-WAAS GPS navigators.

After reviewing the AIM, my interpretation is that WAAS  GPS units do not use RAIM but a non-WAAS IFR approved GPS navigator uses RAIM? Is this correct? If WAAS units do not use RAIM, what do WAAS use for GPS signal integrity?

Any feedback always appreciated.

Excerpt below from AIM 1-1-19:

Receiver Autonomous Integrity Monitoring (RAIM). When GNSS equipment is not using integrity information from WAAS or LAAS, the GPS navigation receiver using RAIM provides GPS signal integrity monitoring. RAIM is necessary since delays of up to two hours can occur before an erroneous satellite transmission can be detected and corrected by the satellite control segment. The RAIM function is also referred to as fault detection. Another capability, fault exclusion, refers to the ability of the receiver to exclude a failed satellite from the position solution and is provided by some GPS receivers and by WAAS receivers.

 

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

2 Answers

  1. Best Answer


    John D. Collins on Apr 19, 2013

    WAAS GPS don’t use RAIM when they are in the coverage area for WAAS. This is because part of the WAAS satellite transmissions include integrity data for each satellite.

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes



  2. Dan Chitty on Apr 19, 2013

    Thank you for the feedback.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.