RAIM Prediction Service Introduction GNSS is considered a main - - PowerPoint PPT Presentation

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RAIM Prediction Service Introduction GNSS is considered a main - - PowerPoint PPT Presentation

Sep 25, 2023 28 likes •370 views

Agenda Item 3.3a RAIM Prediction Service Introduction GNSS is considered a main navigation infrastructure. GNSS is now becoming a critical component of surveillance system, such as ADS-B Unpredicted outages of GNSS services can cause

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Agenda Item 3.3a RAIM Prediction Service

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Introduction

  • GNSS is considered a main navigation infrastructure.
  • GNSS is now becoming a critical component of

surveillance system, such as ADS-B

  • Unpredicted outages of GNSS services can cause

undesired interruptions on aircraft operations

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GNSS

  • GNSS: Global Navigation Satellite System
  • GNSS = System Satellite Constellation +

Augmentations + Aircraft Receivers

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What is RAIM?

  • Receiver Autonomous Integrity Monitoring (RAIM)

provides integrity monitoring of GNSS satellites for aviation applications.

  • RAIM utilizes redundancy of satellite signal

measurements combined with aircraft barometric altitude equipment to detect any faulty satellite signal based on satellite geometry and probability analysis.

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True Position Estimated Positions, No Faulty Satellites Estimated Positions, 1 Faulty Satellite

Checks the integrity of the position fix:

  • Includes local errors, such as

interference

  • Based on the consistency of

measurements

Requires:

  • no data from outside the satellite

receiver

  • redundant satellite measurements

A “rule of thumb”:

  • 5+ satellites to detect a problem
  • 6+ satellites to detect & isolate

problem

Most analyses assume only 1 faulty satellite Multiple failures may be more difficult to detect

What is RAIM?

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Operational Requirements

  • ICAO Annex 10 and ICAO Doc 9613 PBN Manual

require States and Air Navigation Service Providers (ANSPs) to provide timely warnings of GNSS RAIM

  • utages.

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Operational Requirements

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ICAO APANPIRG 22 – September 2011 Conclusion 22/24 – Endorsement of minimum Technical and Operational Requirements for a Regional RAIM Prediction System

That, the States in the Asia/Pacific Region be encouraged to participate in the Regional RAIM Prediction System and the Minimum Technical and Operational Requirements for ASIA/PAC Regional RAIM Prediction System provided be adopted.

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Operational Requirements

  • RAIM prediction results are needed daily by pilots,

flight dispatchers, air traffic controllers and airspace planners.

  • The use of appropriate RAIM prediction services is

considered a necessary part of GNSS approvals.

  • RAIM prediction is required for en-route, terminal

area, and approach operations.

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Thailand’s Progress

  • As of September 2013, AEROTHAI has finished the

procurement and testing of the RAIM prediction system.

  • AEROTHAI’s RAIM Prediction System utilizes the same

engine as EUROCONTROL’s AUGUR RAIM Prediction Service.

  • The service can be accessed at www.netra.aero
  • Expect trial operations for Bangkok FIR in Oct 2013.
  • Expect full operations for Bangkok FIR in Oct 2014.

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Login Page

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Welcome Page

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RAIM Prediction Process Diagram

Satellite Positions

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GPS Status: Current NANUs

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Visibility Tool

(skyplot)

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Visibility: Inputs

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Visibility: Satellite Sky Plot

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Visibility: GPS Visibility Table

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Aerodrome Tool

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RAIM Predictions: by Aerodrome

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RAIM Predictions: by Aerodrome

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RAIM Aerodrome Prediction: Summary

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RAIM Aerodrome Prediction: Details

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RAIM Aerodrome Prediction: Outage Chart

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Route Tool

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RAIM Route Prediction

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RAIM Route Prediction: Waypoint Selection

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RAIM Route Prediction: Waypoint Selection

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RAIM Route Prediction: Waypoint Selection

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RAIM Route Prediction: Route Creation

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RAIM Route Prediction: Summary

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RAIM Route Prediction: Details by Legs

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RAIM Route Prediction: Details by Outage

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RAIM Route Prediction: Outage Chart

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RAIM Aerodrome Prediction: Outage Chart