Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2314

b) Version 1 ES message formats and related requirements apply to more advanced ADS-B applications. Surveillance accuracy and integrity are reported separately as navigation accuracy category (NAC), navigation integrity category (NIC) and surveillance integrity level (SIL). Version 1 ES formats also include provisions for enhanced reporting of status information. Note 1.— The formats and update rates of each register are specified in the Technical Provisions for Mode S Services and Extended Squitter (Doc 9871). Note 2.— The formats for the two versions are interoperable. An extended squitter receiver can recognize and decode both version 0 and version 1 message formats. Note 3.— Guidance material on transponder register formats and data sources is included in the Manual on Mode S Specific Services (Doc 9688). 3.1.2.8.6.3 Extended squitter types 3.1.2.8.6.3.1 Airborne position squitter. The airborne position extended squitter type shall use format DF = 17 with the contents of GICB register 05 {HEX} inserted in the ME field. Note.— A GICB request (3.1.2.6.11.2) containing RR equals 16 and DI equals 7 and RRS equals 5 will cause the resulting reply to contain the airborne position report in its MB field. 3.1.2.8.6.3.1.1 SSS, surveillance status subfield in ME. The transponder shall report the surveillance status of the transponder in this 2-bit (38, 39) subfield of ME when ME contains an airborne position squitter report. Coding signifies no status information signifies transponder reporting permanent alert condition (3.1.2.6.10.1.1.1) signifies transponder reporting a temporary alert condition (3.1.2.6.10.1.1.2) signifies transponder reporting SPI condition (3.1.2.6.10.1.3) Codes 1 and 2 shall take precedence over code 3. 3.1.2.8.6.3.1.2 ACS, altitude code subfield in ME. Under control of ATS (3.1.2.8.6.3.1.3), the transponder shall report either navigation-derived altitude, or the barometric altitude code in this 12-bit (41-52) subfield of ME when ME contains an airborne position report. When barometric altitude is reported, the contents of the ACS shall be as specified for the 13-bit AC field (3.1.2.6.5.4) except that the M-bit (bit 26) shall be omitted. 3.1.2.8.6.3.1.3 Control of ACS reporting. Transponder reporting of altitude data in ACS shall depend on the altitude type subfield (ATS) as specified in 3.1.2.8.6.8.2. Transponder insertion of barometric altitude data in the ACS subfield shall take place when the ATS subfield has the value of ZERO. Transponder insertion of barometric altitude data in ACS shall be inhibited when ATS has the value 1. 3.1.2.8.6.3.2 Surface position squitter. The surface position extended squitter type shall use format DF = 17 with the contents of GICB register 06 {HEX} inserted in the ME field. Note.— A GICB request (3.1.2.6.11.2) containing RR equals 16 and DI equals 7 and RRS equals 6 will cause the resulting reply to contain the surface position report in its MB field. 3.1.2.8.6.3.3 Aircraft identification squitter. The aircraft identification extended squitter type shall use format DF = 17 with the contents of GICB register 08 {HEX} inserted in the ME field. Annex 10 — Aeronautical Telecommunications Volume IV 22/11/07 3-54 Note.— A GICB request (3.1.2.6.11.2) containing RR equals 16 and DI equals 7 and RRS equals 8 will cause the resulting reply to contain the aircraft identification report in its MB field. 3.1.2.8.6.3.4 Airborne velocity squitter. The airborne velocity extended squitter type shall use format DF = 17 with the contents of GICB register 09 {HEX} inserted in the ME field. Note.— A GICB request (3.1.2.6.11.2) containing RR equals 16 and DI equals 7 and RRS equals 9 will cause the resulting reply to contain the airborne velocity report in its MB field. 3.1.2.8.6.3.5 Event-driven squitter. The event-driven extended squitter type shall use format DF = 17 with the contents of GICB register 0A {HEX} inserted in the ME field. Note.— A GICB request (3.1.2.6.11.2) containing RR equals 16 and DI equals 7 and RRS equals 10 will cause the resulting reply to contain the event-driven report in its MB field. 3.1.2.8.6.4 Extended squitter rate 3.1.2.8.6.4.1 Initialization. At power up initialization, the transponder shall commence operation in a mode in which it broadcasts only acquisition squitters (3.1.2.8.5). The transponder shall initiate the broadcast of extended squitters for airborne position, surface position, airborne velocity and aircraft identification when data are inserted into transponder registers 05, 06, 09 and 08 {HEX}, respectively. This determination shall be made individually for each squitter type. When extended squitters are broadcast, transmission rates shall be as indicated in the following paragraphs. Acquisition squitters shall be reported in addition to extended squitters unless the acquisition squitter is inhibited (2.1.5.4). Acquisition squitters shall always be reported if position or velocity extended squitters are not reported. Note 1.— This suppresses the transmission of extended squitters from aircraft that are unable to report position, velocity or identity. If input to the register for a squitter type stops for 60 seconds, broadcast of that extended squitter type will be discontinued until data insertion is resumed. Note 2.— After timeout (3.1.2.8.6.6), this squitter type may contain an ME field of all zeroes. 3.1.2.8.6.4.2 Airborne position squitter rate. Airborne position squitter transmissions shall be emitted when the aircraft is airborne (3.1.2.8.6.7) at random intervals that are uniformly distributed over the range from 0.4 to 0.6 seconds using a time quantization of no greater than 15 milliseconds relative to the previous airborne position squitter, with the exceptions as specified in 3.1.2.8.6.4.7. 3.1.2.8.6.4.3 Surface position squitter rate. Surface position squitter transmissions shall be emitted when the aircraft is on the surface (3.1.2.8.6.7) using one of two rates depending upon whether the high or low squitter rate has been selected (3.1.2.8.6.9). When the high squitter rate has been selected, surface position squitters shall be emitted at random intervals that are uniformly distributed over the range from 0.4 to 0.6 seconds using a time quantization of no greater than 15 milliseconds relative to the previous surface position squitter (termed the high rate). When the low squitter rate has been selected, surface position squitters shall be emitted at random intervals that are uniformly distributed over the range of 4.8 to 5.2 seconds using a time quantization of no greater than 15 milliseconds relative to the previous surface position squitter (termed the low rate). Exceptions to these transmission rates are specified in 3.1.2.8.6.4.7. 3.1.2.8.6.4.4 Aircraft identification squitter rate. Aircraft identification squitter transmissions shall be emitted at random intervals that are uniformly distributed over the range of 4.8 to 5.2 seconds using a time quantization of no greater than 15 milliseconds relative to the previous identification squitter when the aircraft is reporting the airborne position squitter type, or when the aircraft is reporting the surface position squitter type and the high surface squitter rate has been selected. When the surface position squitter type is being reported at the low surface rate, the aircraft identification squitter shall be emitted at random intervals that are uniformly distributed over the range of 9.8 to 10.2 seconds using a time quantization of no greater than 15 milliseconds relative to the previous identification squitter. Exceptions to these transmission rates are specified in 3.1.2.8.6.4.7. Chapter 3 Annex 10 — Aeronautical Telecommunications 3-55 22/11/07 3.1.2.8.6.4.5 Airborne velocity squitter rate. Airborne velocity squitter transmissions shall be emitted when the aircraft is airborne (3.1.2.8.6.7) at random intervals that are uniformly distributed over the range from 0.4 to 0.6 seconds using a time quantization of no greater than 15 milliseconds relative to the previous airborne velocity squitter, with the exceptions as specified in 3.1.2.8.6.4.7. 3.1.2.8.6.4.6 Event-driven squitter rate. The event-driven squitter shall be transmitted once, each time that GICB register 0A {HEX} is loaded, while observing the delay conditions specified in 3.1.2.8.6.4.7. The maximum transmission rate for the event-driven squitter shall be limited by the transponder to twice per second. If a message is inserted in the event-driven register and cannot be transmitted due to rate limiting, it shall be held and transmitted when the rate limiting condition has cleared. If a new message is received before transmission is permitted, it shall overwrite the earlier message. Note.— The squitter transmission rate and the duration of squitter transmissions is application-dependent. Choices made for each application must take into account interference considerations (Manual of the Secondary Surveillance Radar (SSR) Systems (Doc 9684), Chapter 8 refers). 3.1.2.8.6.4.7 Delayed transmission. Extended squitter transmission shall be delayed in the following circumstances:

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