R-Mode Baltic - Status info for Helcom AIS EWG30 Helcom AIS EWG30 - - PowerPoint PPT Presentation

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R-Mode Baltic - Status info for Helcom AIS EWG30 Helcom AIS EWG30 - - PowerPoint PPT Presentation

Jul 23, 2023 27 likes •223 views

R-Mode Baltic - Status info for Helcom AIS EWG30 Helcom AIS EWG30 Marek Dziewicki, MOG Stefan Gewies, DLR, Michael Hoppe, WSV Helsinki 2019 Outline R-Mode concept R-Mode testbed plan for the Baltic Sea Signal-of-opportunity

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SLIDE 1

R-Mode Baltic - Status info for Helcom AIS EWG30 Helcom AIS EWG30

Marek Dziewicki, MOG Stefan Gewies, DLR, Michael Hoppe, WSV

Helsinki 2019

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SLIDE 2
  • R-Mode concept
  • R-Mode testbed plan for the Baltic Sea
  • Signal-of-opportunity coverage predictions for the Southern Baltic Sea

Outline

Chart 2

  • R-Mode user & service requirements on a backup system
  • Ongoing R-Mode Baltic activities
  • Conclusions

R-Mode Baltic – status info for AIS EWG30

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SLIDE 3

R(anging)-Mode Idea - Signals-of-Opportunity

Concept

  • Add ranging capability to existing

maritime: DGPS radio beacons MF (300 kHz) and AIS VHF (162 MHz)

  • Synchronized stations provide

Time

Chart 3

signals with well known time and phase dependency.

  • Range estimation based on time of

arrival (TOA) and phase.

  • Positioning using method of

trilateration Feasibility studies and ongoing tests confirmed this approach

R-Mode Baltic – status info for AIS EWG30

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SLIDE 4
  • deliver R-Mode system justification – why, what for, how ?
  • perform an analysis and evaluation of international legal documents

treating about maritime radionavigation systems in the light of e-Navigation strategy looking for back-up to GNSS (IMO, IALA, ITU, IEC, RTCM, EMRF)….

  • review of Terrestrial Radionavigation Systems (TRS) and their ranging

General Tasks of WP 3.1 Baseline and Priorities

Document was created to:

Chart 4

  • review of Terrestrial Radionavigation Systems (TRS) and their ranging

methods, historical and contemporary (from Decca to GSM, UMTS, LTE networks)

  • review impact from other Projects: ACCSEAS, MF R-Mode or AIS+VDES

(Germany, Netherlands, UK, Canada, China, Korea )

  • define service and user requirements also taking into account VDES

R-Mode Baltic – status info for AIS EWG30

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SLIDE 5
  • Identify sources of possible errors and mitigation methods

(positioning, timing, ambiguity algorithms, propagation, spoofing, jamming)

  • Combine services: MF ( MSK+2CW radiobeacon) and VHF

(AIS, VDES)

General Tasks of WP 3.1 Baseline and Priorities

Chart 5

  • Develop general specification of new components for the

R-Mode positioning system (MF modulator, AIS BS time slots combination, sources of time and frequency).

R-Mode Baltic – status info for AIS EWG30

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SLIDE 6
  • A redundant system provides the same functionality as the primary system,

allowing a seamless transition with no change in procedures.

  • A backup system ensures continuation of the navigation application, but not

necessarily with the full functionality of the primary system and may necessitate some changes in procedures by the user.

Types of alternative R-Nav system

Definitions in IALA Recommendation R-129

R-Mode

Chart 6

  • A contingency system allows safe completion of a manoeuvre, but may not

be adequate for long-term use.

R-Mode

  • GNSS independent time synchronisation
  • GNSS dependent time synchronisation

R-Mode Baltic – status info for AIS EWG30

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SLIDE 7

Signal of MF Beacon as source for R-Mode ranging

  • Spectrum of F+/-CW

Approach: To solve ambiguity - add two 2 continuous wave (CW) signals 225 Hz beside main F carrier of legacy MSK signal . First results (measured)

  • Range : <10 m day ; <50 m night

Challenges

Chart 7

Standard DGNSS (MSK) bandwidth is +/- 250Hz

R-Mode Baltic – status info for AIS EWG30

Challenges

  • Mitigate skywave induced fading
  • Accurate estimation of beat signal

E-layer night

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SLIDE 8

Signals of AIS as source for R-Mode ranging

Approach: Range estimation using bit edge of AIS message transmitted from base station

  • GMSK signal

Challenges:

Chart 8

Lower boundary for range stdev. 5 slot AIS

Challenges:

  • Design AIS message with sufficient

length and autocorrelation (#26)

  • Additional channel load (VDL)

R-Mode Baltic – status info for AIS EWG30

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SLIDE 9

Build a testbed for R-Mode System that

  • ffers:
  • use of R-Mode enabled IALA beacons
  • use of R-Mode enabled AIS base stations
  • Baltic first test for both signal types

R-Mode Baltic: Goals of the Project

First testbed for R-Mode with two signal types MF , VHF

IALA Beacon AIS Base Station

Sweden

Chart 9

  • Baltic first test for both signal types
  • transnational synchronized network
  • prototypes of adapted BS and new onboard

R-Mode receiver

  • preliminary model of global system ?

Show R-Mode is able to meet maritime user requirements for a positioning and timing backup system.

Beacon

Germany Poland

R-Mode Baltic – status info for AIS EWG30

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SLIDE 10
  • Selection of testbed area based on
  • Requirements based on IMO def of backup

system

  • Detailed coverage prediction, which

considers disturbances of signal propagation and station geometry (HDOP)

R-Mode testbed implementation

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  • Up to 6 radio beacons and 4 AIS base

stations will be equipped with R-Mode enabled signal generators

  • Monitor stations will be used to monitor the

proper work of the R-Mode transmitter sites

  • Perform static and dynamic measurements for

position validation The testbed will be available from 2020.

R-Mode Baltic – status info for AIS EWG30

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SLIDE 11

Coverage of the Baltic Sea with MF radio beacon signals

Based on given nominal range

Number of available sites

Chart 11

Sufficient (>3) number of beacons for positioning in wide areas of the Southern Baltic Sea Number of available sites

R-Mode Baltic – status info for AIS EWG30

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SLIDE 12

Coverage of the Baltic Sea with VHF AIS signals

Based on geometrical range (vessel: 10 m antenna height)

Number of available sites

Chart 12

Insufficient (<4) number of stations for positioning in wide areas of the Southern Baltic Sea Number of available sites

R-Mode Baltic – status info for AIS EWG30

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SLIDE 13

Coverage of the Baltic Sea with VHF and MF signals

Considers not disturbances of signal propagation

Number of available sites

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Sufficient number of available signals (>3) for positioning in the Southern Baltic Sea – R-Mode based positioning requires both signals-of-opportunity Number of available sites

R-Mode Baltic – status info for AIS EWG30

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SLIDE 14

Minimum user requirement on a backup system

IALA R-129 based on IMO Resolution A.915(22)

System level parameters Service level parameters Maritime region Absolute Accuracy Integrity Availability % per 30 days Continuity % over 15 minutes Coverage Fix interval (seconds) Horizonta l (meters) Alert limit (meters) Time to Alarm (seconds) Integrity Risk (per 3 hours) Ocean 1000 2500 60 99 N/A² Global 60

Not covered by MF or VHF transmitter signals

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Coastal 100 250 30 99 N/A² Regional 15 Port approach and restricted waters 10 25 10 99 99,97 Regional 2 Port 1 2.5 10 99 99,97 Local 1 Inland Waterways 10 25 10 99 99,97 Regional 2

Not reachable

R-Mode service area

R-Mode Baltic – status info for AIS EWG30

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SLIDE 15
  • Compatibly tests of radio beacons for R-Mode, MF modulator update (Nov. 2018)
  • Detailed coverage prediction for R-Mode on MF radio beacons in the Baltic Sea (May 2019)
  • AIS/VDES: proposal for implementation of R-Mode (until Sep. 2019)
  • Radio beacon: proposal for implementation of R-Mode (until Sep. 2019)

Summary of ongoing project activities

Chart 15

  • Development of concept for R-Mode stations timing (until Sep. 2019)
  • Concept development for R-Mode onboard receiver
  • Test-bed plan ( June 2019)

R-Mode Baltic – status info for AIS EWG30

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SLIDE 16
  • R-Mode onboard receiver development
  • R-Mode VDES land base station development, (transmitter and signal tests )
  • Testbed implementation preparation

Next or just started project activities

Chart 16 R-Mode Baltic – status info for AIS EWG30

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SLIDE 17
  • R-Mode has the potential to support navigation in coastal regions, port

approaches and inland waterways

  • IALA R-129 provides user requirements for R-Mode system development,
  • Both MF and VHF, require base station upgrade to R-Mode to enable

positioning in the Southern Baltic Sea

Conclusions

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  • Both for MF and VHF (also VDES) optional signal tests are in progress
  • Project R-Mode Baltic team will perform fundamental developments and build

up a first testbed that can utilise both signals-of-opportunity

  • IALA will help to develop and standardise R-Mode system
  • R-Mode affects standards and guidelines of IMO, IALA, IEC and RTCM

R-Mode Baltic – status info for AIS EWG30

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SLIDE 18

Thank you for your attention

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marekdz@umgdy.gov.pl

R-Mode Baltic – status info for AIS EWG30

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SLIDE 19

Project partner Project partner

Contact

Stefan Gewies

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Stefan Gewies Project Manager DLR Institute of Communications and Navigation E-mail: Stefan.Gewies@dlr.de www.r-mode-baltic.eu