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3.1.2.8.7.3.1 Airbonze position squittel: The airborne position type ES/NT shall use format DF = 18 with the format
for register 05 {HEX) as defined in 3.1.2.8~6.2 inserted in the ME field.
3.1.2.8.7.3.2 Surfuce position squitter: The surface position type ES/NT shall use format DF = 18 with the format for
register 06 {IIEX) as defined in 3.1.2.8.6.2 inserted in the ME field.
3.1.2.8.7.3.3 Aircraft identification squitter. The aircraft identification type ES/NT shall use format DF = 18 with the
format for register 08 {REX} as defined in 3.1.2.8.6.2 inserted in the ME field.
3.1.2.8.7.3.4 Airborne velocity squitter: The airborne velocity type ESNT shall use format DF = 18 with the format
for register 09 {HEX) as defined in 3.1.2.8.6.2 inserted in the ME field.
3.1.2.8.7~3.5 Event-driven squittel: Thc event-driven type ES/NT shall use format DF = 18 with the format for register
OA {IIEX} as defined ill 3.1.2.8.6.2 inserted in the ME field.
3.1.2.8.7.4 ES/NT squitter rate
3.1.2.8.7.4.1 Initialization. At power up initialization, the non-transponder device shall commence operation in a
mode in which it does not broadcast any squitters. The non-transponder device shall initiate the broadcast of ES/NT
squitters for airborne position, surface position, airborne velocity and aircraft identification when data are available for
inclusion in the ME field of these squitter types. This determination shall be made individually for each squitter type.
When ESINT squitters are broadcast, transmission rates shall be as indicated in 3.1.2.8.6.4.2 to 3.1.2.8.6.4.6.
Note I.- This suppresses the trunsmission of extended squitters from aircrajt that are unable to report position, velocity
or identit)). Ij input to the register for squitter tyyes stops for 60 seconds, broadcast for this mtended squitter type will
ccusc until duta insertion resumes.
Note 2.- After timeout (3.1.2.8.7.6) this squitter type may contain an MEjield of all zeros.
3.1.2.8.7.4.2 Delayed transmission. ESNT squitter transmission shall be delayed if the non-transponder device is
busy broadcasting one of the other squitter types.
3.1.2.8.7.4.2.1 The delayed squitter shall be transmitted as soon as the non-transponder device becomes available
3.1.2.8.7.5 ESRVT antenna selection. Non-transponder devtces operating with antenna diversity (3.1.2.10.4) shall
transmit ESmT squitters as Follows:
a) when airborne (3.1.2.8.6.7), the non-transponder device shall transmit each type of ES/NT squitter alternately from
the two antennas; and
b) when on the surFace (3.1.2.8.6.71, the non-transponder device shall transmit ESINT sqnitters using the top antenna.
3.1.2.8.7.6 Register timeout. The non-transponder device shall clear all 56 bits of the airborne position, surface
position and velocity registers used for these messages if these registers are not updated within two seconds of the previous
update. This timeout shall be determined separately for each of these registers. Termination of extended squitter broadcast
shall be as specified in Annex LO, 'Volume U, Part 1, Appendix 1 to Chapter 5, 2.4.3.
Note.- These registers are cleared to prevent the reporting of outdated position and velocity information.
3.1.2.8.7.7 Airborrre/surface state deternzination. Aircraft with an automatic means of determining on-the-ground
condition shall use this input to sclect whether to report the airborne or surface message types. Aircraft without such
means shall report the airborne type messages.
3.1.2.8.7.8 Suvace squitter rate control. Once per second the algorithm for aircraft motion specified in Tahle 2-7 in
Annex 10, Volume 111, Part I, Appendix 1 to Chapkr 5 shall be executed. The surface squitter rate shall be set according
to the results of this algorithm.
Chapter 3 Annex 10 - Aeronautical Telecommunications
3.1.2.8.8 EXTENDED SQUlTT.FR MILITARY APPLICATION, DOWNLINK FORMAT 19
Note.- This format supports the broadcast of extended squitter ADS-B messages in support of military applications.
A separate format is used to distinguish these extended squitters from the standard ADS-B message set broadcast using
DF = 17 or 18.
3.1.2.8.8.1 Militaryformat. The format used for DF = 19 shall be a 112-bit downlink format containing the following
fields:
Field Reference
DF downlink format
AF control field
3.1.2.8.8.2 Applicationfield. This 3-bit (6-8) downlink field in DF = 19 shall be used to detine the format of the
I 12-bit transmission.
Code 0 to 7 = Reserved
3.1.2.8.9 EXTENDED SQUITTER MAXIMUM TRANSMISSION RATE
3.1.2.8.9.1 The maximum total number of extended squitters (DF = 17, 18 or 19) em~ttedb y any extended squitter
illstallation shall not exceed 6.2 per second.
3.1.2.9 AIRCRAFlTD ENTlRCATION PROTOCOL
3.1.2.9.1 Aircraft identijkation reporting. A ground-initiated Comm-B request (3.1.2.6.11.2) containing RR equals 18
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