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Technical Provisions for Mode S Services and Extended Squitter

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DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris<br />

Chapter 4<br />

OVERVIEW OF EXTENDED SQUITTER VERSION 2<br />

4.1 EXTENDED SQUITTER VERSION 2<br />

4.1.1 The <strong>for</strong>mats <strong>and</strong> protocols <strong>for</strong> ES Version 2 were revised based on experience gained from operational<br />

usage with ADS-B that revealed a number of needed improvements. These included:<br />

a) separated reporting of source <strong>and</strong> system integrity;<br />

b) additional levels of NIC to better support airborne <strong>and</strong> surface applications;<br />

c) incorporation of the broadcast of the <strong>Mode</strong> A code into the emergency/priority message, increased<br />

transmission rates after a <strong>Mode</strong> A code change, <strong>and</strong> the broadcast of the <strong>Mode</strong> A code on the surface;<br />

d) revision to the target state <strong>and</strong> status message to include additional parameters;<br />

e) eliminated the vertical component of NIC <strong>and</strong> NAC;<br />

f) T=0 position extrapolation accuracy changed from within 200 ms of the time of transmission to within<br />

100 ms; <strong>and</strong><br />

f) capabilities were added to support airport surface applications.<br />

Draft<br />

4.1.2 Traffic in<strong>for</strong>mation service — broadcast (TIS-B) (see 3.2) remained unchanged because it is version<br />

independent. ADS-R <strong>for</strong>mats were updated to Version 2 to be compatible with changes to ADS-B <strong>for</strong>mats.<br />

4.1.3 The Version 2 <strong>for</strong>mats <strong>and</strong> protocols in this manual are consistent with RTCA DO-260B <strong>and</strong> EUROCAE ED-<br />

102A [Ref 5].<br />

4.1.4 The <strong>for</strong>mats <strong>for</strong> versions 0, 1 <strong>and</strong> 2 are interoperable in the delivery of critical data. Version 2 <strong>for</strong>mats are<br />

interoperable with Version 0 <strong>and</strong> 1 <strong>for</strong>mats, except <strong>for</strong> minor differences of certain non-critical data, as presented in<br />

detail in Appendix C <strong>and</strong> summarized in Table 4-1.<br />

4-1<br />

DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris

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