Technical Provisions for Mode S Services and Extended Squitter

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DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris A-24 Technical Provisions for Mode S Services and Extended Squitter Note.— This suppresses the transmission of extended squitters from aircraft that are unable to report position, velocity or identity information. A.2.4.2 REGISTER TIME-OUT The transponder shall clear all but the altitude and surveillance status subfields in the airborne position register (transponder register 0516) and all 56 bits of the surface position, squitter status and airborne velocity registers (transponder registers numbers 0616, 0716 and 0916) if these registers are not updated for a time no greater than twice the specified maximum update interval, or 2 seconds (whichever is the greater). This time-out shall be determined separately for each of these registers. The insertion of altitude or surveillance status data by the transponder into these registers shall not qualify as a register update for the purposes of this time-out condition. Note 1.— These registers are cleared to prevent the reporting of outdated position, velocity and squitter rate information. Note 2.— The identification register, 0816, is not cleared since it contains data that rarely changes in flight and is less not frequently updated (see §A.2.1, Note 3). The event-driven register, 0A16 or equivalent transmit register, does not need to be cleared since its contents are only broadcast once each time that the register is loaded (see §A.2.5.5). Refer to §D.2.4.3.3 for implementation guidelines regarding Register 0816. Note 3.— During a register time-out event, the ME field of the extended squitter may contain all zeros, except for any data inserted by the transponder. A.2.4.3 TERMINATION OF EXTENDED SQUITTER BROADCAST If input to the register for a squitter type stops for 60 seconds, broadcast of that extended squitter type shall be discontinued until data insertion is resumed. The insertion of altitude by the transponder satisfies the minimum requirement for continuing to broadcast the airborne position squitter. Note 1.— Until time-out, a squitter type may contain an ME field of all zeros. Draft Note 2.— Continued transmission for 60 seconds is required so that receiving aircraft will know that the data source for the message has been lost. A.2.4.4 REQUIREMENTS FOR NON-TRANSPONDER DEVICES Non-transponder devices shall provide the same functionality for initialization; register time-out and broadcast termination as specified for the transponder case in §A.2.4.1 to §A.2.4.3, except that: a) It shall not broadcast acquisition squitters; and b) When the navigation input fails, when operating on the surface it shall continue to broadcast DF=18 with message TYPE Code = 0 at the high rate specified for the surface position message (Annex 10, Volume IV, §3.1.2.8.6.4.3). Note.— Continued broadcast of the surface position message is needed to support the operation of surface multilateration systems. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Appendix A A-25 A.2.5 GENERAL FORMATTER/MANAGER (GFM) The general formatter/manager (GFM) shall format messages for insertion in the transponder registers. A.2.5.1 NAVIGATION SOURCE SELECTION The GFM shall be responsible for the selection of the default source for aircraft position and velocity, the commanded altitude source, and for the reporting of the associated position and altitude errors. A.2.5.2 LOSS OF INPUT DATA The GFM shall be responsible for loading the registers for which it is programmed at the required update rate. If for any reason data are unavailable, the GFM shall perform the actions specified in §A.2.1.1. For transponder registers 0516 and 0616, a loss of position data shall cause the GFM to set the format TYPE Code to zero as the means of indicating “no position data” since all zeros in the latitude/longitude fields is a legal value. A.2.5.3 SPECIAL PROCESSING FOR FORMAT TYPE CODE ZERO A.2.5.3.1 SIGNIFICANCE OF FORMAT TYPE CODE EQUAL TO ZERO Format TYPE Code = 0 shall signify “no position information”. This shall be used when the latitude/longitude information is not available or invalid and still permit the reporting of barometric altitude loaded by the transponder. Note 1.— The principal use of this message is to provide ACAS the ability to passively receive altitude. Note 2.— Special handling is required for the airborne and surface position messages because a CPR encoded value of all zeros in the latitude/longitude field is a valid value. A.2.5.3.2 BROADCAST OF FORMAT TYPE CODE EQUAL TO ZERO Format TYPE Code = 0 shall only be set by the following events: Draft 1) An extended squitter register monitored by the transponder (registers 0516, 0616, 0716 and 0916) has timed out (see §A.2.4.2). In this case, the transponder shall clear the entire 56 bits of the register that timed out. In the case of the airborne position register, the altitude subfield shall only be zeroed if no altitude data are available. Transmission of the extended squitter that broadcasts the timed out register shall itself stop in 60 seconds. Broadcast of this extended squitter shall resume when the GFM begins to insert data into the register. 2) The GFM determines that all navigation sources that can be used for the extended squitter airborne or surface position message are either missing or invalid. In this case, the GFM shall clear the format TYPE Code and all other fields of the airborne or surface position message and insert this zeroed message in the appropriate register. This shall only be done once so that the transponder can detect the loss of data insertion and suppress the broadcast of the related squitter. Note.— In all of the above cases, a format TYPE Code of zero contains a message of all zeros. The only exception is the airborne position format that may contain barometric altitude and surveillance status data as set by the transponder. There is no analogous case for the other extended squitter message types, since a zero value in any of the fields indicates no information. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Msg Bit # “ME” Bit # Appendix C
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Appendix C C-59 Register 0516 DRAFT
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Appendix CD CD-23 CD.2.4.7.5 BINARY
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