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cat008-asterix-monoradar-weather-data-part-3

EUROPEAN ORGANISATION FOR THE SAFETY OF

AIR NAVIGATION

EUROPEAN AIR TRAFFIC MANAGEMENT

EUROCONTROL STANDARD DOCUMENT

FOR

RADAR DATA EXCHANGE

Part 3

Transmission of Monoradar Derived

Weather Information

SUR.ET1.ST05.2000-STD-03-01

Edition

: 1.1

Edition Date : November 2010 Status : Released Issue Class

General Public

DOCUMENT IDENTIFICATION SHEET

DOCUMENT DESCRIPTION

Document Title

Radar Data Exchange - Part 3

Transmission of Monoradar Derived Weather Information

EWP DELIVERABLE REFERENCE NUMBER

PROGRAMME REFERENCE INDEX EDITION : 1.1

SUR.ET1.ST05.2000-STD-03-01 EDITION DATE : November 2010

Abstract

This document describes the application of ASTERIX to the transmission of monoradar derived weather information.

Keywords

Radar Data Source Data Category Message Structure Data Item

Data Block UAP

CONTACT PERSON : A. Engel TEL : +32-2-729 3355UNIT : CND/CoE/CN/SU

DOCUMENT STATUS AND TYPE

STATUS CATEGORY CLASSIFICATION Working Draft Executive Task General Public Draft Specialist Task EATCHIP Proposed Issue Lower Layer Task Restricted Released Issue

ELECTRONIC BACKUP

INTERNAL REFERENCE NAME : ASTERIX -Part 3

HOST SYSTEM MEDIA SOFTWARE(S)

Microsoft Windows Type : Hard disk

Media Identification :

Radar Data Exchange - Part 3

Transmission of Monoradar Derived Weather Information SUR.ET1.ST05.2000-STD-03-01

Edition : 1.1 Released Issue Page iii

This document has been produced by the Eurocontrol Agency Copyright is vested with the Eurocontrol Agency

The content or any part thereof is thus freely available to Member States' representatives, but copy or disclosure to any other party is subject to prior consent in writing by the Eurocontrol Agency.

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DOCUMENT APPROVAL

The following table identifies all management authorities who have successively approved the present issue of this document.

AUTHORITY NAME AND SIGNATURE

DATE

ASTERIX Manager D. Doukas

SUR Domain Manager J.-M. Duflot

SURT Chairman EATM/CND Director

B. Redeborn

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DOCUMENT CHANGE RECORD

The following table records the complete history of the successive editions of the present document.

EDITION DATE REASON FOR CHANGE SECTIONS

PAGES

AFFECTED

Proposed May 1997 ? New format and numbering to comply with

EATCHIP Document Configuration rules. ? The “S” in SAC/SIC renamed System instead of Source, to allow for both source and destination codes.

ALL 1.0 November 1997 Adoption by the Eurocontrol Permanent Commission

1.1 November 2010 Signature Page updated Description of item I008/040 updated v

5.2.7

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TABLE OF CONTENTS

DOCUMENT IDENTIFICATION SHEET.................................................................................ii COPYRIGHT NOTICE...........................................................................................................iii DOCUMENT APPROVAL......................................................................................................v DOCUMENT CHANGE RECORD.........................................................................................vi TABLE OF CONTENTS.......................................................................................................vii FOREWORD. (ix)

1. INTRODUCTION (1)

1.1 Purpose...........................................................................................................................1 1.1.1 General.........................................................................................................................1 1.1.2 Notification of Differences .............................................................................................1 1.1.3 Structure of The Eurocontrol Standard for Radar Data Exchange.................................2 1.2 Scope (2)

2. REFERENCES (3)

2.1 General............................................................................................................................3 2.2 Reference Documents. (3)

3. DEFINITIONS, ACRONYMS AND ABBREVIATIONS (5)

3.1 Definitions.......................................................................................................................5 3.2 Acronyms and Abbreviations. (6)

4. GENERAL PRINCIPLES (7)

4.1 General............................................................................................................................7 4.2 Data Messages...............................................................................................................7 4.2.1 Representation and Transmission of Precipitation Zones..............................................7 4.2.2 Precision in Data Items Expressing a Distance.............................................................8 4.2.3 Weather Messages.......................................................................................................9 4.3 Control Messages ..........................................................................................................9 4.4 Transmission of Monoradar Derived Weather Information.........................................9 4.4.1 User Application Profile.................................................................................................9 4.4.2 Message Transmission..................................................................................................9 4.4.3 Data Block. (10)

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4.5 Composition of Messages (10)

5. LAYOUT OF THE WEATHER MESSAGES (11)

5.1 Standard Data Items (11)

5.2 Description of Standard Data Items (12)

5.2.1 Data Item I008/000, Message Type (12)

5.2.2 Data Item I008/010, Data Source Identifier (12)

5.2.3 Data Item I008/020, Vector Qualifier (13)

5.2.4 Data Item I008/034, Sequence of Polar Vectors in SPF Notation (15)

5.2.5 Data Item I008/036, Sequence of Cartesian Vectors in SPF Notation (16)

5.2.6 Data Item I008/038, Sequence of Weather Vectors in SPF Notation (17)

5.2.7 Data Item I008/040, Contour Identifier (18)

5.2.8 Data Item I008/050, Sequence of Contour Points in SPF Notation (19)

5.2.9 Data Item I008/090, Time of Day (20)

5.2.10 Data Item I008/100, Processing Status (21)

5.2.11 Data Item I008/110, Station Configuration Status (22)

5.2.12 Data Item I008/120, Total Number of Items Constituting One Weather Picture (22)

5.3 Transmission of Weather Messages (23)

5.3.1 Standard User Application Profile and Use of Standardised Data Items (23)

5.3.2 Encoding Rules (24)

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FOREWORD

1 Responsible Body

This Standard has been developed and is maintained by the Surveillance Task Force on Radar Data Exchange (STFRDE) of the European Air Traffic Control Harmonisation and Integration Programme (EATCHIP). 2 EATCHIP Work Programme Document

This Standard is identified as deliverable 02 in the EATCHIP Work Programme Document (EWPD), Surveillance Domain, Executive Task 01, Specialist Task 05. 3 Approval of the Standard

3.1 This Standard is adopted in accordance with the procedures outlined in the Directives for Eurocontrol Standardisation, Ref 000 - 2 - 93.

3.2 This Standard becomes effective upon adoption by the Permanent Commission of Eurocontrol.

4 Technical Corrigenda and Amendments

This Standard is kept under review by the responsible body who, when changes or corrections are necessary, will prepare the required amendments or technical corrigenda. The procedure for the maintenance of this Standard is laid down in Annex H of the Directives for the Uniform Drafting and Presentation of Eurocontrol Standard Documents, Ref 000 - 1 - 92. 5 Editorial Conventions

5.1 The format of this Standard complies with the Directives for the Uniform Drafting and Presentation of Eurocontrol Standard Documents.

5.2

The following practice has been adhered to in order to indicate at a glance the status of each statement: ? Normative Elements have been printed in light face roman text; ?

Recommended Elements have been printed in light face italics, the status being indicated by the prefix Recommendation.

5.3

The following editorial practice has been followed in the writing of specifications: ? for Normative Elements the operative verb "shall" is used; ?

for Recommended Elements the operative verb "should" is used.

5.4

Any information which is essential to the understanding of a particular indent will be integrated within the text as a note. It will not contain specifications and will be placed immediately after the indent to which it refers.

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6 Relationship to Other Standard Documents

This Standard is related to the Eurocontrol Standard for Radar Surveillance in

En-Route Airspace and Major Terminal Areas Ref 006 - 95.

7 Status of Annexes to This Document

There are no Annexes to this Part of the Standard Document.

8 Language Used

The original version of this Standard Document is in the English language. Page x Released Issue Edition : 1.1

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INTRODUCTION

1.1

Purpose

1.1.1 General

The present Eurocontrol Standard concerns the transmission of radar related data between radar data sources (e.g. radar stations, Radar Data Processing (RDP) systems) and sinks (end user data processing systems) and describes the message structure for the exchange of radar related data between radar stations and centres and between Air Traffic Control (ATC) centres, to be used in the Eurocontrol area.

The transmission of radar data makes use of the message structure, known by the acronym ASTERIX , standing for A ll Purpose ST ructured Eurocontrol R adar I nformation E X change, devised by the Study Group on the Exchange of radar related data between processors of ATC systems, this group was a subgroup of the former Radar Systems Specialist Panel (RSSP), whose responsibilities have been taken over by the EATCHIP Surveillance Team as from April 1994. ASTERIX was approved by the former RSSP at their 15th Meeting held on 1/4 July 1986. 1.1.2 N otification of Differences

Eurocontrol Member States and other States making use of this Standard are required to notify the Agency of any differences between their National Standard for the exchange of radar data and this Eurocontrol Standard and any amendments thereto.

Further, States are invited to keep the Agency currently informed of any differences which may subsequently occur, or of the withdrawal of any differences previously notified.

A specific request for notification of differences will be sent to States immediately after the adoption of each amendment to this Standard.

Differences notified by States will be published as a supplement to this Standard.

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1.1.3 Structure of The Eurocontrol Standard for Radar Data Exchange

This Eurocontrol Standard for Radar Data Exchange contains the following

Parts:

Part 1: All Purpose Structured Eurocontrol Radar Information Exchange-

ASTERIX

This Part contains the specifications and the conventions used in

the framework of ASTERIX.

Part 2a: Transmission of Monoradar Target Reports

This Part describes the standard application of ASTERIX for the

transmission of monoradar target reports (plots, tracks) from a

radar station to one or more RDP system(s).

Part 2b: Transmission of Monoradar Service Messages

This Part describes the standard application of ASTERIX for the

transmission of monoradar service messages from a radar station

to one or more RDP system(s).

Part 3: Transmission of Monoradar Derived Weather Information

This Part describes the standard application of ASTERIX for the

transmission of relatively simple meteorological images of

precipitation areas of various intensity levels from a radar station

to one or more RDP system(s).

NOTE - Other Parts will be added to this Eurocontrol Standard as new

applications using the ASTERIX message structure are identified

and deemed suitable to be standardised.

1.2 S cope

1.2..1The present document describes the transmission of relatively simple

meteorological images of precipitation areas of various intensity levels, from a

radar station to one or more data processing system(s).

1.2.2This Part of the Eurocontrol Standard specifies the message structure and

contents of weather information transmitted by a stand alone radar station

conforming to the ASTERIX Standard.

1.2.3 Weather information is data out of Data Category 008.

1.2.4This Part of the Eurocontrol Standard shall be effective from December 1997. Page 2 Released Issue Edition : 1.1

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R EFERENCES

2.1

G eneral

The following Documents and Standards contain provisions which, through references in this text, constitute provisions of this Eurocontrol Standard Document.

At the time of publication of this Eurocontrol Standard Document, the editions indicated for the referenced documents and standards were valid.

Any revision of the referenced ICAO Documents shall be immediately taken into account to revise this Eurocontrol Standard Document.

Revisions of the other referenced documents shall not form part of the provisions of this Eurocontrol Standard Document until they are formally reviewed and incorporated into this Eurocontrol Standard Document.

In the case of a conflict between the requirements of this Eurocontrol Standard Document and the contents of the other referenced documents, this Eurocontrol Standard Document shall take precedence.

2.2

R eference Documents

1. Eurocontrol Standard 000-1-9

2. Directives for the Uniform Drafting and Presentation of Eurocontrol Standard Documents. 1992.

Eurocontrol Standard SUR.ET1.ST05.2000-STD-01-01. All Purpose Structured Eurocontrol Radar Information Exchange - ASTERIX.

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D EFINITIONS, ACRONYMS AND ABBREVIATIONS

3.1

D efinitions

For the purposes of this Eurocontrol Standard document, the following definitions shall apply: 3.1.1

Calculated Item:

A piece of information (e.g. the position of a target) derived from the raw radar information through an intermediate processing such as transformation of coordinates, tracking, code conversion, etc.

3.1.2

Catalogue of Data Items: List of all the possible Data Items of each Data Category describing the Data Items by their reference, structure, size and units (where applicable).

3.1.3

Data Block:

Unit of information seen by the application as a discrete entity by its contents. A Data Block contains one or more Record(s) containing data of the same category.

3.1.4 Data Category: Classification of the data in order to permit inter alia an easy identification.

3.1.5

Data Field:

Physical implementation for the purpose of communication of a Data Item, it is associated with a unique Field Reference Number and is the smallest unit of transmitted information.

3.1.6 Data Item: The smallest unit of information in each Data Category. 3.1.7

Measured Item:

A piece of information (e.g. the position of a target) directly derived from the radar information and transmitted without any intermediate processing.

3.1.8 Record:

A collection of transmitted Data Fields of the same category preceeded by a Field Specification field, signalling the presence/absence of the various Data Fields

3.1.9

User

Application Profile: The mechanism for assigning Data Items to Data Fields, and containing all necessary information which needs to be standardised for the successful encoding and decoding of the messages.

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3.2 A cronyms and Abbreviations

For the purposes of this Eurocontrol Standard Document the following shall

apply:

°Degree (angle)

ASTERIX A ll Purpose ST ructured Eurocontrol R adar I nformation

E X change

ATC Air Traffic Control

CAT Data Category

EATCHIP European Air Traffic Control Harmonisation and Integration

Programme

EOP End Of Picture

EWPD EATCHIP Work Programme Document

f Scalin

g factor

FRN Field Reference Number

FSPEC Field Specification

FX Field Extension Indicator

ICAO International Civil Aviation Organization

LEN Length Indicator

LSB Least Significant Bit

NM Nautical Mile, unit of distance (6 080 feet)

RDP Radar Data Processing (system)

REP Field Repetition Indicator

RFS Random Field Sequencing

RSSP Radar Systems Specialist Panel

s second, unit of time

SAC System Area Code

SIC System Identification Code

SOP Start Of Picture

SP Special Purpose Indicator

SPF Standard Precision Format

STFRDE Surveillance Task Force on Radar Data Exchange

UAP User Application Profile (see Definitions)

UTC Coordinated Universal Time

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4. GENERAL PRINCIPLES 4.1

General

The transmission of monoradar derived weather information requires the transmission of two types of messages: ? data messages containing elements of the weather image; ?

control messages.

NOTE -

Both type of messages are composed from Data Items belonging to Data Category 008.

4.2

D ata Messages

4.2.1 R epresentation and Transmission of Precipitation Zones

4.2.1.1 Images of precipitation zones shall be represented and transmitted according to one of the three methods as detailed below. 4.2.1.2 Shaded Areas of Polar Vectors

4.2.1.2.1 A zone of precipitation shall be represented by means of a series of closely spaced vectors, expressed in local polar coordinates.

4.2.1.2.2

Recommendation This method should typically be applied for the transmission of precipitation zones from a weather data extractor to a remote computer system in an ATC centre for further processing and/or display. 4.2.1.3 Shaded Areas of Cartesian Vectors

4.2.1.3.1

A precipitation zone shall be represented by means of sets of parallel vectors, expressed in a cartesian coordinate system the origin of which is either the radar site reference point, or another site reference point.

4.2.1.3.2 Recommendation It should be possible to use more than one shading orientation, to express different precipitation intensity levels. 4.2.1.4 Contours of Precipitation Zones

4.2.1.4.1

A precipitation zone shall be represented by a set of consecutive summit points which constitute a closed area contour. The summit points being expressed in a local coordinate system.

4.2.1.4.2

Recommendation This method should typically be applied if the precipitation zones are visualised by other display techniques than shaded area, e.g. by colouring the area, according to the intensity level. NOTE -

The method 'Contours of Precipitation Zones' appears attractive if a lower capacity narrow-band transmission medium is used; especially if contour-point reduction techniques are used at the expense of some degradation in precision.

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4.2.2 P recision in Data Items Expressing a Distance

4.2.2.1

All Data Items expressing a distance shall use a one-octet (sub)field for the parameter range, vector length and coordinates of a contour point (i.e. Standard Precision Format (SPF)).

4.2.2.2

Due to the great diversity with regard to maximum coverage and precision requirements in the various ATC applications, a fixed value shall not be assigned to the Least Significant Bit (LSB) of Data Items expressing a distance in Data Category 008.

4.2.2.3

The decisive factors for a proper LSB setting shall be the maximum coverage range and the intrinsic precision of the radar sensor. The application of a scaling factor (f) is the mechanism to match precision to the prevailing conditions, i.e. the binary value will multiplied by 2f (binary shift over f positions) to yield the real parameter value.

4.2.2.4

As the standard quantisation units, the following values shall be chosen: ?

(2-6

) NM, for vector length and coordinates of contour points;

? (2-7) NM, for range.

NOTE - The consequences for the LSB, minimum and maximum values

for the various parameters are given in Table 1.

Table 1 - Standard Quantisation Units

Data Item LSB Parameter Range Range (start,end) Length

(x,y)

(-7+f)

2(-6+f)

0 < p < 2

(1+f)

0 < p < 2(2+f)

-2(1+f) < p < 2(1+f)

4.2.2.5

The possibilities of such a mechanism for dealing with ranges shall be as illustrated below: ? for a radar with a maximum range of 32 NM a value f = 4 may be chosen, which yields an LSB = 0.125 NM;

for a weather radar device with a coverage range up to 250 NM a value of f = 7 may be selected. This means however a limited precision due to an LSB = 1 NM.

NOTE - A negative value f = -1 may be adopted, resulting in a high

precision of 1/256 NM (this is only useful if justified by the precision of the sensor).

4.2.2.6 The scaling factor, f, shall be a parameter of the Start Of Picture (SOP) message.

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4.2.3 W eather Messages

4.2.3.1 Weather messages shall contain images of precipitation zones in only one of the three possible representations.

4.2.3.2 Recommendations

1. A variable number of elements of the weather of the same intensity

should be packed within one ASTERIX Record.

2. A number of Records should be packed together into one ASTERIX

Data Block.

4.3

C ontrol Messages

Two types of control messages are identified: ?

Start of Picture (SOP)

This message shall be used to signal the start of a new data renewal cycle and to provide additional information such as the time of day and actual processing and configuration status of the radar station. ?

End of Picture (EOP)

This message shall be used to signal the end of a data renewal cycle and to provide a count of the total number of items constituting the

weather image transmitted. The latter value allows the receiver to verify whether all items were actually received.

4.4

T ransmission of Monoradar Derived Weather Information

4.4.1 User Application Profile

A single User Application Profile (UAP) has been defined and standardised and shall be used to transmit weather information (data and control messages).

Since data and control messages are composed from Data Items out of the same Data Category, it is possible to mix both type of messages within a Data Block.

4.4.2 Message Transmission

4.4.2.1 At the start of a data renewal cycle, the data messages shall be preceded by an SOP message.

4.4.2.2

At the end of a data renewal cycle, the data messages shall be followed by an EOP message.

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4.4.3 Data Block

Data Blocks containing monoradar derived weather information shall have the following layout:

CAT = 008 LEN F SPEC Items of the first record

FSPEC Items of the

last record

where: ? Data Category (CAT) = 008, is a one-octet field indicating that the Data

Block contains monoradar derived weather information; ? Length Indicator (LEN) is a two-octet field indicating the total length in octets of the Data Block, including the CAT and LEN fields; ?

FSPEC is the Field Specification.

4.5

C omposition of Messages

4.5.1 Messages shall be composed of Data Items assembled in the order defined by the Field Reference Number (FRN) in the associated UAP. 4.5.2 Data Items shall be either compulsory or optional.

4.5.2.1 Compulsory items represent commonly used data required by any application, they shall be implemented.

4.5.2.2 Optional items represent more specific data and their implementation shall be negotiated between users.

4.5.3 Whether Data Items are compulsory or optional, they shall be either always transmitted or conditionally transmitted.

4.5.3.1 When compulsory, they shall always be transmitted in a Record with the corresponding FSPEC bits set to one.

4.5.3.2

When optional, they shall be present in a Record only if certain conditions are met (e.g. availability of the data). The corresponding FSPEC bits being set to one or to zero according to the presence or absence of the fields.