Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 4604

c) for a reply probability equal to 0.25 or less: the smaller of 10 interrogations per 3 dB beam dwell or 125 interrogations per second. 3.1.2.5.2.1.4.2 Field content for a selectively addressed interrogation. Selectively addressed interrogations used in connection with acquisition using lockout override shall have interrogation field contents restricted as follows: Note.— These restrictions permit surveillance and GICB transactions, but prevent the interrogation from making any changes to transponder multisite lockout or communications protocol states. 3.1.2.5.2.1.5 Supplementary acquisition using II equals 0 Note.— The acquisition technique defined in 3.1.2.5.2.1.4 provides rapid acquisition for most aircraft. Due to the probabilistic nature of the process, it may take many interrogations to acquire the last aircraft of a large set of aircraft in the same beam dwell and near the same range (termed a local garble zone). Acquisition performance is greatly improved for the acquisition of these aircraft through the use of limited selective lockout using II equals 0. Coding (in binary) signifies that the IC field contains the II code signifies that the IC field contains SI codes 1 to 15 signifies that the IC field contains SI codes 16 to 31 signifies that the IC field contains SI codes 32 to 47 signifies that the IC field contains SI codes 48 to 63 UF = 4, 5, 20 or 21 PC = 0 RR ≠16 if RRS = 0 DI = 7 IIS = 0 LOS = 0 except as specified in 3.1.2.5.2.1.5 TMS = 0 2007/70/II. szám Chapter 3 Annex 10 — Aeronautical Telecommunications 3-27 28/11/02 3.1.2.5.2.1.5.1 Lockout within a beam dwell 3.1.2.5.2.1.5.1.1 Recommendation.— When II equals 0 lockout is used to supplement the acquisition technique of 3.1.2.5.2.1.4, all aircraft within the beam dwell of the aircraft being acquired should be commanded to lockout to II equals 0, not just those in the garble zone. Note.— Lockout of all aircraft in the beam dwell will reduce the amount of all-call fruit replies generated to the II equals 0 all-call interrogations. 3.1.2.5.2.1.5.2 Duration of lockout Note 1.— Supplementary acquisition consists of locking out acquired aircraft to II = 0 followed by acquisitions by means of the Mode S-only all-call interrogation with II equals 0. Note 2.— Minimizing the lockout time reduces the probability of conflict with the acquisition activities of a neighbouring interrogator that is also using II equals 0 for supplementary acquisition. 3.1.2.5.2.1.5.2.1 Recommendation.— Interrogators performing supplementary acquisition using II equals 0 (in connection with the technique of 3.1.2.5.2.1.4) should perform acquisition by transmitting a lockout command for no more than a single scan to each of the acquired aircraft in the beam dwell containing the garble zone. 3.1.2.5.2.1.5.2.2 Recommendation.— Mode S only all-call interrogations with II = 0 for the purpose of supplementary acquisition should take place over no more than two consecutive scans. 3.1.2.5.2.2 All-call reply, downlink format 11 The reply to the Mode S-only all-call or the Mode A/C/S all-call interrogation shall be the Mode S all-call reply, downlink format 11. The format of this reply shall consist of these fields: 3.1.2.5.2.2.1 CA: Capability. This 3-bit (6-8) downlink field shall contain an encoded definition of the communications capability of the transponder and shall be used in the all-call reply format (DF = 11). DF CA AA PI Field Reference DF downlink format 3.1.2.3.2.1.2 CA capability 3.1.2.5.2.2.1 AA address announced 3.1.2.5.2.2.2 PI parity/interrogator identifier 3.1.2.3.2.1.4 Coding signifies no communications capability (surveillance only), and no ability to set CA code 7 and either airborne or on the ground reserved reserved reserved signifies at least Comm-A and Comm-B capability and ability to set CA code 7 and on the ground signifies at least Comm-A and Comm-B capability and ability to set CA code 7 and airborne signifies at least Comm-A and Comm-B capability and ability to set CA code 7 and either airborne or on the ground signifies the DR field is not equal to 0 or the FS field equals 2, 3, 4 or 5, and either airborne or on the ground 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume IV 28/11/02 3-28 When the conditions for CA code 7 are not satisfied, installations that have communications capability but do not have automatic means to set the on-the-ground condition shall use CA code 6. Aircraft with automatic on-the-ground determination shall use CA code 4 or 5. Data link capability reports (3.1.2.6.10.2.2) shall be available from aircraft installations that set CA code 4, 5, 6 or 7. Note.— CA codes 1 to 3 are reserved for use by Mode S transponders that do not have the ability to set CA code 7. Transponders with these codes will provide a data link capability report (3.1.2.6.10.2.2). No data link transactions other than GICB extraction including aircraft identity, ACAS RA extraction, and downlink broadcast extraction, should be attempted with these transponders. 3.1.2.5.2.2.2 AA: Address announced. This 24-bit (9-32) downlink field shall contain the aircraft address which provides unambiguous identification of the aircraft. 3.1.2.5.3 Lockout protocol. The all-call lockout protocol defined in 3.1.2.6.9 shall be used by the interrogator with respect to an aircraft once the address of that specific aircraft has been acquired by an interrogator. Note.— Following acquisition, a transponder is interrogated by discretely addressed interrogations as prescribed in 3.1.2.6, 3.1.2.7 and 3.1.2.8 and the all-call lockout protocol is used to inhibit replies to further all-call interrogations. 3.1.2.5.4 Stochastic all-call protocol. The transponder shall execute a random process upon acceptance of a Mode Sonly all-call with a PR code equal to 1 to 4 or 9 to 12. A decision to reply shall be made in accordance with the probability specified in the interrogation. A transponder shall not reply if a PR code equal to 5, 6, 7, 13, 14 or 15 is received (3.1.2.5.2.1.1). Note.— The random occurrence of replies makes it possible for the interrogator to acquire closely spaced aircraft, replies from which would otherwise synchronously garble each other. 3.1.2.6 ADDRESSED SURVEILLANCE AND STANDARD LENGTH COMMUNICATION TRANSACTIONS Note 1.— The interrogations described in this section are addressed to specific aircraft. There are two basic interrogation and reply types, short and long. The short interrogations and replies are UF 4 and 5 and DF 4 and 5, while the long interrogations and replies are UF 20 and 21 and DF 20 and 21. Note 2.— The communications protocols are given in 3.1.2.6.11. These protocols describe the control of the data exchange. 3.1.2.6.1 SURVEILLANCE, ALTITUDE REQUEST, UPLINK FORMAT 4 The format of this interrogation shall consist of these fields: 3.1.2.6.1.1 PC: Protocol. This 3-bit, (6-8) uplink field shall contain operating commands to the transponder. The PC field shall be ignored for the processing of surveillance or Comm-A interrogations containing DI = 3 (3.1.2.6.1.4.1). UF PC RR DI SD AP Field Reference UF uplink format 3.1.2.3.2.1.1 PC protocol 3.1.2.6.1.1 RR reply request 3.1.2.6.1.2 DI designator identification 3.1.2.6.1.3 SD special designator 3.1.2.6.1.4 AP address/parity 3.1.2.3.2.1.3 2007/70/II. szám Chapter 3 Annex 10 — Aeronautical Telecommunications 3-29 28/11/02 3.1.2.6.1.2 RR: Reply request. This 5-bit, (9-13) uplink field shall command the length and content of a requested reply. The last four bits of the 5-bit RR code, transformed into their decimal equivalent, shall designate the BDS1 code (3.1.2.6.11.2 or 3.1.2.6.11.3) of the requested Comm-B message if the most significant bit (MSB) of the RR code is 1 (RR is equal to or greater than 16). Coding RR = 0-15 shall be used to request a reply with surveillance format (DF = 4 or 5); RR = 16-31 shall be used to request a reply with Comm-B format (DF = 20 or 21); RR = 16 shall be used to request transmission of an air-initiated Comm-B according to 3.1.2.6.11.3; RR = 17 shall be used to request a data link capability report according to 3.1.2.6.10.2.2; RR = 18 shall be used to request aircraft identification according to 3.1.2.9; 19-31 are not assigned in section 3.1. Note.— Codes 19-31 are reserved for applications such as data link communications, airborne collision avoidance systems (ACAS), etc. 3.1.2.6.1.3 DI: Designator identification. This 3-bit (14-16) uplink field shall identify the structure of the SD field (3.1.2.6.1.4). 3.1.2.6.1.4 SD: Special designator. This 16-bit (17-32) uplink field shall contain control codes which depend on the coding in the DI field. Note.— The special designator (SD) field is provided to accomplish the transfer of multisite, lockout and communications control information from the ground station to the transponder. Coding signifies no action signifies non-selective all-call lockout (3.1.2.6.9.2) not assigned not assigned signifies close out Comm-B (3.1.2.6.11.3.2.3) signifies close out uplink ELM (3.1.2.7.4.2.8) signifies close out downlink ELM (3.1.2.7.7.3) not assigned. Coding signifies SD not assigned except for IIS signifies SD contains multisite and communications control information signifies SD contains control data for extended squitter signifies SD contains SI multisite lockout, broadcast and GICB control information 4-6 signifies SD not assigned signifies SD contains extended data readout request, multisite and communications control information. DI CODE SD FIELD STRUCTURE IIS IIS MBS MES LOS RSS TMS 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume IV 28/11/02 3-30 3.1.2.6.1.4.1 Subfields in SD. The SD field shall contain information as follows:

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