AI 1.10 Aviation

Agenda item 1.10

1.10        to consider spectrum needs and regulatory provisions for the introduction and use of the Global Aeronautical Distress and Safety System (GADSS), in accordance with Resolution 426 (WRC-15);

Resolution 426 (WRC-15): Studies on spectrum needs and regulatory provisions for the introduction and use of the Global Aeronautical Distress and Safety System

 

Executive summary

In accordance with Resolution 426 (WRC-15), ITU-R considered spectrum needs and regulatory provisions for the introduction and the use of the global aeronautical distress and safety system (GADSS).

Two methods were developed, both of which state that no changes to Radio Regulations (RR) Article 5 are required in addition to suppression of Resolution 426 (WRC-15).

Method A involves modification to RR Article 30 and a new RR Article 34A to recognize GADSS in the RR.

Method B involves different modifications to RR Article 30, a different new RR Article 34A, a Resolution requiring the development of ITU-R Recommendations to list the frequency bands of the systems contributing to GADSS, their technical characteristics and protection criteria. Method B also states that systems composing the GADSS should only operate in primary allocations when used for safety purposes.

Method C proposes no changes to the RR.

 

Background

The International Civil Aviation Organization (ICAO) has developed a concept of operations (ConOps) to support the future development of GADSS.

The ConOps  describes in particular the following functions:

–             Aircraft tracking

•             Typically uses existing technologies to assist in the timely identification and location of aircraft.

•             Provides an automated reporting function every 15 mins or less.

•             Aircraft tracking may be accomplished by multiple different systems over the duration of a flight.

–             Autonomous distress tracking

•             An automated method of position reporting at intervals of one minute or less to support search and rescue (SAR), triggered by indications that an aircraft is in distress which may result in an accident.

•             Distress tracking aims to establish the location of a potential accident site within a six nautical mile (11.11 km) radius.

–             Post-flight localisation and recovery

•             A combination of both the immediate need to locate and rescue possible survivors after an air accident using emergency location beacons and other methods to an accuracy of <1 nautical mile (<1.85 km), and the timely collection of aircraft components and data that will assist in the accident investigation.

–             Procedures and information management

•             The method of data collection and notification of flight tracking data to the relevant SAR, and rescue coordination centres.

The ConOps provides the guidelines for the development of ICAO performance-based standards, outlining specific technical and operational requirements that an aircraft shall meet. It does not identify specific systems proposed to contribute to GADSS. ICAO intends to use systems operating under existing allocations in accordance with the provisions of the RR, including the use of emergency position-indicating radio beacons (termed as emergency locator transmitters in ICAO) operating in the 406-406.1 MHz frequency band .

In addition, ICAO is of the view that:

1)            systems being utilised to meet GADSS requirements should not receive any additional priority beyond that accorded by the RR to the radiocommunication service(s) under which those systems operate, and

2)            ICAO does not support regulatory modifications that would require future WRC action in order to update or modify GADSS requirements and/or systems available for satisfying GADSS requirements.

 

Summary and analysis of the results of ITU-R studies

ICAO has concluded that the GADSS requirements can be satisfied using systems operating within existing aeronautical frequency allocations or distress spectrum, (e.g. the 406-406.1 MHz frequency band) and that the WRC-19 need not establish additional spectrum allocations. Therefore, no changes are required to RR Article 5.

Possible changes to other portions of RR have been identified to facilitate GADSS implementation .

 

Methods to satisfy the agenda item

Three methods are proposed to satisfy the agenda item and all involve suppression of Resolution 426 (WRC-15).

Method A

This method proposes modification of the RR to include GADSS as a distress and safety communications system in RR Chapter VII – Distress and safety communications.

The modifications of RR proposed under Method A specify:

–             that the details of the GADSS elements are contained in Annexes to the ICAO Convention;

–             that the type of radiocommunication service used depends on the requirements of the specific GADSS function;

–             that radiocommunication systems contributing to the GADSS are operated in conformity with the RR;

–             that operation of GADSS elements under RR No. 4.4 is precluded.

 

Method B

This method proposes modification of the RR to include GADSS as a distress and safety communications system in RR Chapter VII – Distress and safety communications. In addition, the frequency bands used for GADSS, its systems, their technical characteristics and protection criteria should be reflected in the relevant ITU-R Recommendations. Therefore, a new Resolution calling on ICAO to provide the necessary information to ITU-R and inviting ITU-R to develop appropriate Recommendations should be developed.

The modifications of the RR proposed under Method B specify:

–             that the details of the GADSS elements are contained in Annexes to the ICAO Convention;

–             that radiocommunication systems contributing to the GADSS are operated in conformity with the RR;

–             that the use of frequency bands for GADSS shall be limited to systems that operate in accordance with recognised international aviation standards;

–             that the use of GADSS shall also not prevent the use of these frequency bands by any applications of services to which these bands are allocated on a primary basis, and shall not establish a priority for GADSS in the RR;

–             that the GADSS must operate in accordance with the terms of new Resolution resolving:

•             that systems composing the GADSS shall only operate in primary allocations when used for safety purposes;

•             that ITU-R shall develop ITU-R Recommendations detailing the system elements of the GADSS including their operating frequency bands and technical characteristics;

•             that if constituent elements of GADSS are changed, those changes should be reflected in the relevant ITU-R Recommendation.

 

 

Method C

No action is required from the WRC19 as ICAO is able to implement the GADSS under the current RR.

 

CEPT position

CEPT proposes no change to the Radio Regulations Article 5 but proposes a reference to GADSS in Article 30.

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