Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2455

b) Type II extended squitter receiving systems receive ADS-B and TIS-B messages and are capable of producing complete ADS-B and TIS-B reports in accordance with the equipment class. Type II extended squitter receiving systems may be controlled by an external entity to produce installation-defined subsets of the reports that those systems are capable of producing. Note 2.— Extended squitter ground receiving systems receive ADS-B messages and produce either application-specific subsets or complete ADS-B reports based on the needs of the ground service provider, including the client applications to be supported. Note 3.— The extended squitter message reception function may be physically partitioned into hardware separate from those that implement the report assembly function. 5.2.3.3 ADS-B REPORT TYPES Note 1.— The ADS-B report refers to the restructuring of ADS-B message data received from Mode S extended squitter broadcasts into various reports that can be used directly by a set of client applications. Five ADS-B report types are defined by the following subparagraphs for output to client applications. Additional information on the ADS-B report contents and the Chapter 5 Annex 10 — Aeronautical Telecommunications 5-5 22/11/07 applicable mapping from extended squitter messages to ADS-B reports can be found in the Manual on the Secondary Surveillance Radar (SSR) Systems (Doc 9684) and RTCA DO-260A. Note 2.— The use of precision (e.g. GNSS UTC measured time) versus non-precision (e.g. internal receiving system clock) time sources as the basis for the reported time of applicability is described in 5.2.3.5. 5.2.3.3.1 State vector report. The state vector report shall contain time of applicability, information about an airborne or vehicle’s current kinematic state (e.g. position, velocity), as well as a measure of the integrity of the navigation data, based on information received in airborne or ground position, airborne velocity, and identification and type extended squitter messages. Since separate messages are used for position and velocity, the time of applicability shall be reported individually for the position related report parameters and the velocity related report parameters. Also, the state vector report shall include a time of applicability for the estimated position and/or estimated velocity information (i.e. not based on a message with updated position or velocity information) when such estimated position and/or velocity information is included in the state vector report. Note.— Specific requirements for the customization of this type of report may vary according to the needs of the client applications of each participant (ground or airborne). The state vector data is the most dynamic of the four ADS-B reports; hence, the applications require frequent updates of the state vector to meet the required accuracy for the operational dynamics of the typical airborne or ground operations of airborne and surface vehicles. 5.2.3.3.2 Mode status report. The mode status report shall contain time of applicability and current operational information about the transmitting participant, including airborne/vehicle address, call sign, ADS-B version number, airborne/vehicle length and width information, state vector quality information, and other information based on information received in operational status, airborne identification and type, airborne velocity and airborne status extended squitter messages. Each time that a mode status report is generated, the report assembler function shall update the report time of applicability. Parameters for which valid data is not available shall either be indicated as invalid or omitted from the mode status report. Note 1.— Specific requirements for the customization of this type of report may vary according to the needs of the client applications of each participant (ground or airborne). Note 2.— Once the target state and status message (as shown in the Manual on Mode S Specific Services (Doc 9688)) becomes available, certain parameters conveyed in that message type are also to be included in the mode status reports. Note 3.— The age of the information being reported within the various data elements of a mode status report may vary as a result of the information having been received within different extended squitter messages at different times. Data being reported beyond the useful life of that parameter type may be either indicated as invalid or omitted from the mode status report as described in the Manual on the Secondary Surveillance Radar (SSR) Systems (Doc 9684). 5.2.3.3.3 Air referenced velocity report. Air referenced velocity reports shall be generated when air referenced velocity information is received in airborne velocity extended squitter messages. The air referenced velocity report shall contain time of applicability, airspeed and heading information. Only certain classes of extended squitter receiving systems, as defined in 5.2.3.5, are required to generate air referenced velocity reports. Each time that an individual mode status report is generated, the report assembly function shall update the report time of applicability. Note 1.— The air referenced velocity report contains velocity information that is received in airborne velocity messages along with additional information received in airborne identification and type extended squitter messages. Air referenced velocity reports are not generated when ground referenced velocity information is being received in the airborne velocity extended squitter messages. Guidance on the air referenced velocity report contents is provided in the Manual on the Secondary Surveillance Radar (SSR) Systems (Doc 9684). Note 2.— Specific requirements for the customization of this type of report may vary according to the needs of the client applications of each participant (ground or airborne). Annex 10 — Aeronautical Telecommunications Volume IV 22/11/07 5-6 5.2.3.3.4 Resolution advisory (RA) report. The RA report shall contain time of applicability and the contents of an active ACAS resolution advisory (RA) as received in a Type=28 and Subtype=2 extended squitter message. Note.— The RA report is only intended to be generated by ground receiving subsystems when supporting a ground ADS-B client application(s) requiring active RA information. An RA report will nominally be generated each time a Type=28, Subtype=2 extended squitter message is received. 5.2.3.3.5 TARGET STATE REPORT Note.— The requirements for reporting of target state information is not at the same level of maturity as for the other ADS-B report types. The reporting of target state information is currently not required, but may in the future be required for Class A2 and A3 airborne receiving systems. Once supported, the target state report will be generated when information is received in target state and status messages, along with additional information received in airborne identification and type extended squitter messages. The target state and status message is defined in the Manual on Mode S Specific Services (Doc 9688). Specific requirements for the customization of this type of report may vary according to the needs of the client applications of each participant (ground or airborne). Guidance on the target state report contents is provided in the Manual on Mode S Specific Services (Doc 9688). 5.2.3.4 TIS-B REPORT TYPES 5.2.3.4.1 As TIS-B messages are received by airborne receiving systems, the information shall be reported to client applications. Each time that an individual TIS-B report is generated, the report assembly function shall update the report time of applicability to the current time. Note 1.— The TIS-B message formats are defined in the Technical Provisions for Mode S Services and Extended Squitter (Doc 9871). Note 2.— The TIS-B report refers to the restructuring of TIS-B message data received from ground Mode S extended squitter broadcasts into reports that can be used by a set of client applications. Two ADS-B report types are defined by the following subparagraphs for output to client applications. Additional information on the TIS-B report contents and the applicable mapping from extended squitter messages to ADS-B reports can be found in the Manual on the Secondary Surveillance Radar (SSR) Systems (Doc 9684). Note 3.— The use of precision (e.g. GNSS UTC measured time) versus non-precision (e.g. internal receiving system clock) time sources as the basis for the reported time of applicability is described in 5.2.3.5. 5.2.3.4.2 TIS-B target report. All received information elements, other than position, shall be reported directly, including all reserved fields for the TIS-B fine format messages and the entire message content of any received TIS-B management message. The reporting format is not specified in detail, except that the information content reported shall be the same as the information content received. 5.2.3.4.3 When a TIS-B position message is received, it is compared with tracks to determine whether it can be decoded into target position (i.e. correlated to an existing track). If the message is decoded into target position, a report shall be generated within 0.5 seconds. The report shall contain the received position information with a time of applicability, the most recently received velocity measurement with a time of applicability, the estimated position and velocity applicable to a common time of applicability, airborne/vehicle address, and all other information in the received message. The estimated values shall be based on the received position information and the track history of the target. 5.2.3.4.4 When a TIS-B velocity message is received, if it is correlated to a complete track, a report shall be generated, within 0.5 seconds of the message reception. The report shall contain the received velocity information with a time of applicability, the estimated position and velocity applicable to a common time of applicability, airborne/vehicle address, and all other information in the received message. The estimated values shall be based on the received ground reference velocity information and the track history of the target. Chapter 5 Annex 10 — Aeronautical Telecommunications 5-7 22/11/07 5.2.3.4.5 TIS-B management report. The entire message content of any received TIS-B management message shall be reported directly to the client applications. The information content reported shall be the same as the information content received. 5.2.3.4.5.1 The contents of any received TIS-B management message shall be reported bit-for-bit to the client applications. Note.— The processing of TIS-B management messages is defined in the Technical Provisions for Mode S Services and Extended Squitter (Doc 9871). 5.2.3.5 REPORT TIME OF APPLICABILITY The receiving system shall use a local source of reference time as the basis for reporting the time of applicability, as defined for each specific ADS-B and TIS-B report type (see 5.2.3.3 and 5.2.3.4). 5.2.3.5.1 Precision time reference. Receiving systems intended to generate ADS-B and/or TIS-B reports based on the reception of surface position messages, airborne position messages, and/or TIS-B messages shall use GNSS UTC measured time for the purpose of generating the report time applicability for the following cases of received messages:

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