Minimum Aviation System Performance Standards for Aircraft ...

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© 20xx, RTCA, Inc. • Ground Speed (GS) or • Airspeed (AS) or • Radio height from radio altimeter (RH) AND any of the following conditions is true: • GS > 100 knots or • AS > 100 knots or • RH > 100 50 ft, THEN, the participant shall (242AR3.51-A) set its Air/Ground state to “known to be airborne.” b. Otherwise, the participant shall (242AR3.51-B) set its Air/Ground state to “known to be on the surface.” 3.5.1.3.1.2 Effect of Air/Ground State The set of SV elements to be broadcast by ADS-B participants is determined by those participants’ air/ground state as follows: a. ADS-B participants that are known to be on the surface shall (242AR3.52) transmit those State Vector report elements that are indicated with bullets (“•”) in the “required from surface participants” column of Table 3.5.1.3. b. ADS-B participants that are known to be airborne shall (242AR3.53) transmit those SV report elements that are indicated by bullets (“•”) in the “required from airborne participants” column of Table 3.5.1.3. c. ADS-B participants for which the air/ground state is uncertain shall (242AR3.54) transmit those SV report elements that are indicated by bullets in the “required from airborne participants” column. It is recommended that such participants should also transmit those SV elements that are indicated with bullets in the “required from surface participants” column. 3.5.1.3.2 SV Report Update Requirements Required SV report update rates, described by operating range, are given in Table 3.4.3.3.1.1a (§3.4.3.3.1.1). a. A receiving ADS-B subsystem shall (242AR3.55) update the SV report that it provides to user applications about a transmitting ADS-B participant whenever it receives messages from that participant providing updated information about any of the SV report elements with the exception that SV reports are not required to be issued at a rate of greater than once per second.
. For ADS-B systems that use segmented messages for SV data, time-critical SV report elements that are not updated in the current received message shall (242AR3.56) be estimated whenever the SV report is updated. The time-critical SV elements are defined as the following: i. Geometric position (latitude, longitude, geometric height, and their validity flags – elements 4a, 4b, 4c, 5a, 5b); ii. Horizontal velocity and horizontal velocity validity (elements 6a, 6b, 6c, 7a, 7b); iii. Heading while on the surface (elements 8a, 8b); iv. Pressure altitude (elements 9a, 9b); v. Vertical rate (elements 10a, 10b); and vi. NIC (element 11). Note 1: Estimation of NIC is done by simply retaining the last reported value. c. For time-critical elements of the SV report, a ADS-B receiving subsystem’s report assembly function shall (242AR3.57) indicate “no data available” if no data are received in the preceding coast interval specified in Table 3.4.3.3.1.1a (§3.4.3.3.1.1). Note 2: An ADS-B receiving subsystem may mark data elements as “no data available” by setting the associated validity bit(s) to ZERO. For NIC this is done by setting the value of NIC to ZERO. 3.5.1.3.3 Time of Applicability (TOA) Field for SV Report The Time of Applicability (TOA) field in the SV report describes the time at which the elements of that report are valid. Note: As mentioned in the definition of latency in §3.4.3.3.2.1, the times of applicability of position and velocity may differ. The TOA field in the SV report contains the time of applicability of position. The time of applicability (TOA) relative to local system time shall (242AR3.58) be updated with each State Vector report update. Requirements on the accuracy of the TOA field in the SV report are given in §3.4.3.3.2.2, and may be paraphrased as follows: a. The standard deviation of the SV report time error is to be less than 0.5 s. b. The mean report time error for the position elements of the SV report is not to exceed 0.5 s. c. The mean report time error for the velocity elements of the SV report is not to exceed 1.5 s. © 20xx, RTCA, Inc.
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FOREWORD This document was prepared
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TABLE OF CONTENTS 1 PURPOSE AND SCO
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3.3.23 Selected Heading Sign Field.
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LIST OF TABLES Table 2-5: High Leve
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2 © 20xx, RTCA, Inc. C: Derivation
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4 1.2.3 ASA Architecture © 20xx, R
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6 © 20xx, RTCA, Inc. The TCAS traf
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8 © 20xx, RTCA, Inc. DO-3xx ADS-B
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10 1.3.1.4 Basic Surface Situationa
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12 2 Operational Requirements 2.1 G
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14 © 20xx, RTCA, Inc. timeliness,
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16 © 20xx, RTCA, Inc. Table 2-6: R
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18 2. FAA TSO-C195 states applicati
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20 © 20xx, RTCA, Inc. Notes for Ta
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22 © 20xx, RTCA, Inc. • Optimiza
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24 © 20xx, RTCA, Inc. same approac
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26 © 20xx, RTCA, Inc. may allow de
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28 © 20xx, RTCA, Inc. An aircraft
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30 Information ↓ Initial Acquisit
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32 © 20xx, RTCA, Inc. NRA - 3 NM E
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34 © 20xx, RTCA, Inc. Aircraft typ
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38 © 20xx, RTCA, Inc. In Figure 3.
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40 © 20xx, RTCA, Inc. Figure 3.1.1
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46 © 20xx, RTCA, Inc. Table 3.1.1.
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50 © 20xx, RTCA, Inc. Figure 3-8 i
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52 USER AIR INTERFACE © 20xx, RTCA
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54 3.1.4.2.1.4 ADS-R in Enroute and
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56 TIS‐B Non‐Equipped © 20xx,
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58 © 20xx, RTCA, Inc. available fo
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60 3.2.2 Identification 3.2.2.1 Cal
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62 © 20xx, RTCA, Inc. i. Lighter-t
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64 © 20xx, RTCA, Inc. The ADS-B po
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66 3.2.4.2 Altitude © 20xx, RTCA,
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68 3.2.7 Heading © 20xx, RTCA, Inc
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Page 108 and 109: 96 3.4.2.2 Latency 3.4.2.3 Integrit
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Page 142 and 143: 3.5.1.4.9 Capability Class (CC) Cod
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Page 160 and 161: Appendix A Page A-2 ©20xx, RTCA, I
Page 166 and 167: Appendix A Page A-8 A.2 Definitions
Page 168 and 169: Appendix A Page A-10 Air/Ground Sta
Page 170 and 171: Appendix A Page A-12 Collision Avoi
Page 172 and 173: Appendix A Page A-14 Extended Displ
Page 174 and 175: Appendix A Page A-16 Latency Compen
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Page 178 and 179: Appendix A Page A-20 TCAS Potential
Page 180 and 181: Appendix B Bibliography
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B Bibliography Appendix B Page B-1
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Appendix B Page B-3 Name Reference
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