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Technical Provisions for Mode S Services and Extended Squitter

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 />

Appendix DE DE-3<br />

Coding<br />

(Binary) (Decimal)<br />

Meaning<br />

00 0 Unknown mode or in<strong>for</strong>mation unavailable<br />

01 1 “Acquiring” <strong>Mode</strong><br />

10 2 “Capturing” or “Maintaining” <strong>Mode</strong><br />

11 3 Reserved<br />

D.2.7 TARGET ALTITUDE<br />

This 10-bit (ME bits 16 — 25, Message bits 48 — 57) subfield shall be used to provide aircraft’s next intended level-off<br />

altitude if in a climb or descent, or the aircraft current intended altitude if it is intending to hold its current altitude. The<br />

reported target altitude shall be the operational altitude recognized by the aircraft’s guidance system. The target altitude<br />

subfield shall be as specified in the following table.<br />

Coding<br />

(Binary) (Decimal) Meaning<br />

00 0000 0000 0 Target altitude = -1 000 feet<br />

00 0000 0001 1 Target altitude = -900 feet<br />

00 0000 0010 2 Target altitude = -800 feet<br />

*** *** ***<br />

00 0000 1011 11 Target altitude = zero (0) feet<br />

00 0000 1100 12 Target altitude = 100 feet<br />

Draft<br />

*** *** ***<br />

11 1111 0010 1010 Target altitude = 100 000 feet<br />

11 1111 0011 —<br />

11 1111 1111<br />

1011 — 1023 Invalid (out of range)<br />

D.2.8 HORIZONTAL DATA AVAILABLE/SOURCE INDICATOR<br />

This 2-bit (ME bits 26 — 27, message bits 58 — 59) subfield shall be used to identify if aircraft horizontal state<br />

in<strong>for</strong>mation is available <strong>and</strong> present as well as the data source <strong>for</strong> the horizontal target data when present in the<br />

subsequent subfields. The horizontal data available/source Indicator subfield shall be encoded as specified in the<br />

following table. Any message parameter associated with horizontal target state <strong>for</strong> which an update has not been<br />

received from an on-board data source within the past 5 seconds shall be considered invalid <strong>and</strong> so indicated in the<br />

horizontal data available/source indicator subfield.<br />

Coding Meaning<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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