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Technical Provisions for Mode S Services and Extended Squitter

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Appendix C C-61<br />

Register 0716<br />

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

Figure C-3. <strong>Extended</strong> <strong>Squitter</strong> Status<br />

1<br />

2<br />

TRANSMISSION RATE SUBFIELD (TRS)<br />

Purpose: To provide in<strong>for</strong>mation on the capability <strong>and</strong> status<br />

of the <strong>Extended</strong> <strong>Squitter</strong> rate of the transponder.<br />

3<br />

4<br />

ALTITUDE TYPE SUBFIELD (ATS)<br />

5 Transmission Rate Subfield (TRS) coding:<br />

6 0 = No capability to determine surface squitter rate<br />

7 1 = High surface squitter rate selected<br />

8 2 = Low surface squitter rate selected<br />

9<br />

10<br />

11<br />

3 = Reserved<br />

12 Altitude Type Subfield (ATS) coding:<br />

13 0 = Barometric altitude<br />

14<br />

15<br />

16<br />

1 = GNSS Height (HAE), ARINC 429 Label 370<br />

17<br />

Note.— Aircraft determination of surface squitter rate. For<br />

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22<br />

aircraft that have the capability to automatically<br />

determine their surface squitter rate, the method that<br />

must be used to switch between the high <strong>and</strong> low<br />

transmission rates is as follows:<br />

23<br />

a) Switching from high to low rate: Aircraft must<br />

24<br />

switch from high to low rate when the onboard<br />

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navigation unit reports that the aircraft’s position<br />

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27<br />

has not changed more than 10 meters in any 30<br />

second interval.<br />

28 RESERVED<br />

29<br />

b) Switching from low to high rate: Aircraft must<br />

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31<br />

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33<br />

switch from low to high rate as soon as the<br />

aircraft’s position has changed by 10 meters, or<br />

more since the low rate was selected.<br />

34<br />

In all cases, the automatically selected transmission<br />

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56<br />

rate is subject to being overridden by comm<strong>and</strong>s<br />

received from ground control.<br />

Draft<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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