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COVERGNSS v2.0

COVERGNSS: World ATM. Victor M. Gordo 10/03/15

Contents

Main index


Introduction Background What is COVERGNSS?

Technical Features Main Functionalities

Resources management GNSS Studies Ground Navaids Studies Compative studies

Conclusions

2

Current situation

Introduction


The arising of the concept of Performance Based Navigation (PBN) and the development of Satellite Navigation Systems (GNSS) are causing an important evolution of air navigation, since terrestrial systems have passed, increasingly, to be secondary and even redundant in many phases of flight and mid-term decommissioning is planned. However, it is widely recognized that reversion systems are still necessary:

ICAO: 12th ANC - The implementation of PBN offers an opportunity for the rationalization of terrestrial navigation aids, but there is a need to retain a minimum network of terrestrial aids to mitigate the potential loss of GNSS service.

FAA: NextGen/FRN 2011_31541 The FAA will ensure sufficient infrastructure is provided to mitigate the effects of scheduled GPS outages in designated areas and unscheduled outages which could otherwise significantly disrupt air commerce.

SESAR: 15.3.1 - Foresee backup systems and reversionary operation procedures to recover from GNSS degradation or failures due to system failures and radio frequency interference (RFI)

3

Current situation

Introduction


Transition from conventional navigation to PBN/GNSS Complex decision for ANSPs. Several factors to be considered: Redundancy level Cost Saving Increased Capacity GNSS performances downgrade backup

4

COVERGNSS

What is COVERGNSS?

Introduction


CoverGNSS is a SW tool developed to evaluate the global navigation performances provided in a certain airspace, considering both ground navaids and GNSS (GPS+EGNOS+Galileo+GPS L5). The tool integrates a Geographical Information System (GIS) which help the analyst providing a configurable graphical presentation of the results, according to the specific requirements of the final users. Main objectives:

PBN Implementation Navaids Rationalization Global performances analysis, considering fleet equipage Support to the design and validation of Instrument Flight Procedures Assessment of the navigation performances downgrade in case of GNSS or

navaids outages. Support to SESAR ATM Masterplan

5

INECO SW Tools

Introduction


6

Main technical features

Technical Features


Multiprocessor

Higher performances for complex studies. Better time/complexity ratio. Not blocking.

GIS

OpenSource (SDK) 3D Representation High resolution. WMS web server Flexible.

7

Resources management

Main functionalities


Resources Objects defined for the studies, which can be used in different ones. Stations

Ground Navaids: VOR, DME. SBAS RIMS (Ranging Integrity Monitoring Stations)

Locations Virtual receivers Area Grids IFP

GNSS constellations Almanacs automatic download or manual selection SBAS CPF models (Central Processing Facility) Obstacles (.shp files)

8

GIS

GNSS Studies

Main functionalties. GNSS studies


9

Satelites position, visibility and status Almanacs: orbital parameters NANUs: outages

DOP RAIM Errors

HNSE_95 = 2.45/sqrt (2) * UERE * HDOP VNSE_95 = 1.96 * UERE * VDOP HNSE_95(t) = 2.45/sqrt(2) x sqrt(M11 + M22) VNSE_95(t) = 1.96sqrt(M33)

GPS

SBAS

GNSS Studies



10

Navigation alerts Dependant on the number of visible satellites, the protection limits and the phase of flight.

Continuity analysis Critical satellites Constellation validity function (alerts+ RNP in each phase of flight) Deterministic Model MTTR and MTBF values Stochastic Model Markov

Availability analysis

Deterministic Model NANUs and constellation function Stochastic Model Markov

GNSS Studies Configuration



11

Step 1 Study parameters selection

Step 2 GNSS features selection

RIMS

GNSS Studies Configuration



12

Step 4 Phase of flight and RNP

parameters selection

Step 3 Type of study selection: punctual, route or area

GNSS Studies Results



Geometry , accuracy, continuity, availability and RAIM admisibility.

13




Temporal evolution of the performances received in a certain point

14

RAIM Admissibility Continuity Availability

DOP Accuracy




Accuracy, continuity and availability statistical maps

15




Accuracy, continuity and availability statistical maps

16

Ground Navaids Studies

Main functionalties. Ground Navaids studies


Line-of-sight coverage calculation DME (UHF) and VOR (VHF) frequency bands propagation. PEE calculation

PEE for DME-DME navigation DME stations errors: E1 y E2. PEE for VOR-DME navigation VOR angular error and DME distance error Avionic requirements

Minimum field power density (ICAO Annex10) DME minimum distance: 3 NM DME maximum distance: 160 NM Maximum elevation angle: 40 FOM: ARINC 424

17

Ground Navaids Studies Configuration



18

Step 1 Study parameters selection

Step 2 Navaids selection

Step3 Type of study selection: punctual, route or area

Ground Navaids Studies Results



Number of stations in coverage at each point or area cell Accuracy, continuity and availability values

19

Ground Navaids Studies Results



20

Comparative (global) studies

Main functionalties. Comparative studies


Instantaneous and mean period peformances both of GNSS and Ground Navaids.

Join performances comparison, including accuracy, continuity and availability If Rcombinado = 100% Navaids rationalization study considering Fleet equipage forecast If Rcombinado < 100% Number of ground navaids to be maintaned

21

Comparative studies configuration and results



22

Selection of GNSS and Ground Navids studies to compare Direct comparison and rationalization study option Corrective factor considering fleet equipage (Optional)

Dynamic Comparison Parameters modification and

results view in the same screen

Decision making

Comparative studie considering fleet



23

Analysis of the navigation performances achievable. Fleet evolution impact studies.

Dynamic Comparison Parameters modification and

results view in the same screen

Decision making

Conclusions

Conclusions and added value


24

COVERGNSS added value Global analysis

No split GNSS and Ground navaids analyses. Joint analysis provided. Real scenario, considering fleet equipage. Not only GPS+EGNOS, also GPS L5, Galileo: Future.

Potential uses for ANSPs

Global performances analysis in a certain air space Rationalization and performances evaluation

Safety studies support Numerical values to present to the NSA.

Cost/Benefit Analysis Considering fleet equipage. Global performances and future improvements.

Thank you for your atention!


25

Victor Gordo [email protected]

mailto:[email protected]

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