Minimum Aviation System Performance Standards for Aircraft ...

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Appendix A Page A-16 Latency Compensation – High accuracy applications may correct for system latency introduced position errors using ADS-B time synchronized position and velocity information. Low Level Alert – An optional alert issued when CDZ penetration is predicted outside of the CDZ alert boundary. Mixed Equipage – An environment where all aircraft do not have the same set of avionics. For example, some aircraft may transmit ADS-B and others may not, which could have implications for ATC and pilots. A mixed equipage environment will exist until all aircraft operating in a system have the same set of avionics. Nautical mile (NM) – A unit of length used in the fields of air and marine navigation. In this document, a nautical mile is always the international nautical mile of 1852 meters exactly. Navigation Accuracy Category - Position (NACP) – The NACP parameter describes the accuracy region about the reported position within which the true position of the surveillance position reference point is assured to lie with a 95% probability at the reported time of applicability. Navigation Accuracy Category - Velocity (NACV) – The NACV parameter describes the accuracy about the reported velocity vector within which the true velocity vector is assured to be with a 95% probability at the reported time of applicability. Navigation Integrity Category (NIC) – NIC describes an integrity containment region about the reported position, within which the true position of the surveillance position reference point is assured to lie at the reported time of applicability. Navigation sensor availability – An indication of the ability of the guidance function to provide usable service within the specified coverage area, and is defined as the portion of time during which the sensor information is to be used for navigation, during which reliable navigation information is presented to the crew, autopilot, or other system managing the movement of the aircraft. Navigation sensor availability is specified in terms of the probability of the sensor information being available at the beginning of the intended operation. [RTCA DO-247, §5.2.2.3] Navigation sensor continuity – The capability of the sensor (comprising all elements generating the signal in space and airborne reception) to perform the guidance function without non-scheduled interruption during the intended operation. [RTCA DO-247, §5.2.2.2] Navigation sensor continuity risk – The probability that the sensor information will be interrupted and not provide navigation information over the period of the intended operation. [RTCA DO-247, §5.2.2.2] Navigation System Integrity – This relates to the trust that can be placed in the correctness of the navigation information supplied. Integrity includes the ability to provide timely and valid warnings to the user when the navigation system must not be used for navigation.Navigation Uncertainty Category (NUC) – Uncertainty categories for the state vector navigation variables are characterized by a NUC data set provided in the ADS-B sending system. The NUC includes both position and velocity uncertainties. (This term was used in DO-242. DO-242A separated the integrity and accuracy components of NUC into NIC, NAC, and SIL parameters.) Operational Mode Code – A code used to indicate the current operational mode of transmitting ADS-B participants. ©20xx, RTCA, Inc.
Appendix A Page A-17 Own-ship – From the perspective of a flight crew, or of the ASSAP and CDTI functions used by that flight crew, the own-ship is the ASA participant (aircraft or vehicle) that carries that flight crew and those ASSAP and CDTI functions. Passing Maneuvers – Procedures whereby pilots use: 1) onboard display of traffic to identify an aircraft they wish to pass; 2) traffic display and weather radar to establish a clear path for the maneuver; and 3) voice communication with controllers to positively identify traffic to be passed, state intentions and report initiation and completion maneuver. Persistent Error – A persistent error is an error that occurs regularly. Such an error may be the absence of data or the presentation of data that is false or misleading. An unknown measurement bias may, for example, cause a persistent error. Positional Uncertainty – Positional uncertainty is a measure of the potential inaccuracy of an aircraft’s position-fixing system and, therefore, of ADS-B-based surveillance. Use of the Global Positioning System (GPS) reduces positional inaccuracy to small values, especially when the system is augmented by either space-based or ground-based subsystems. However, use of GPS as the position fixing system for ADS-B cannot be assured, and positional accuracy variations must be take into account in the calculation of CDZ and CAZ. When aircraft are in close proximity and are using the same position-fixing system, they may be experiencing similar degrees of uncertainty. In such a case, accuracy of relative positioning between the two aircraft may be considerably better than the absolute positional accuracy of either. If, in the future, the accuracy of relative positioning can be assured to the required level, it may be possible to take credit for the phenomenon in calculation of separation minima. For example, vertical separation uses this principle by using a common barometric altitude datum that is highly accurate only in relative terms. Primary Surveillance Radar (PSR) – A radar sensor that listens to the echoes of pulses that it transmits to illuminate aircraft targets. PSR sensors, in contrast to secondary surveillance radar (SSR) sensors, do not depend on the carriage of transponders on board the aircraft targets. Proximity Alert – An alert to the flight crew that something is within pre-determined proximity limits (e.g., relative range, or relative altitude difference) of own vehicle. Range reference – The CDTI feature of displaying range rings or other range markings at specified radii from the own-ship symbol. Received Update Rate – The sustained rate at which periodic ADS-B messages are successfully received, at a specified probability of reception. ©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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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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70 3.2.8.7 Other Capability Codes
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72 SDA Value (decimal) (binary) 0 0
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74 © 20xx, RTCA, Inc. Table 3.2.9.
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78 © 20xx, RTCA, Inc. Table 3.2.12
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80 3.2.16 Geometric Vertical Accura
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82 © 20xx, RTCA, Inc. Note: Users
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84 3.2.24 Selected Heading Field ©
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86 © 20xx, RTCA, Inc. a. The ADS-B
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88 3.4.1.1 Definitions © 20xx, RTC
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90 Source Info Category Information
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92 © 20xx, RTCA, Inc. 5. Required
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94 © 20xx, RTCA, Inc. ASSAP shall
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96 3.4.2.2 Latency 3.4.2.3 Integrit
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98 3.4.2.11 Suitability of Traffic
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100 3.4.3.1 ADS-B Surveillance Cove
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102 © 20xx, RTCA, Inc. required to
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104 Equipage Class ↓ B0 Aircraft
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© 20xx, RTCA, Inc. Table 3.4.3.3.1
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© 20xx, RTCA, Inc. Notes for Table
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Operational Domain → © 20xx, RTC
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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 176 and 177: Appendix A Page A-18 Regime - Divis
Page 178 and 179: Appendix A Page A-20 TCAS Potential
Page 180 and 181: Appendix B Bibliography
Page 182 and 183: B Bibliography Appendix B Page B-1
Page 184 and 185: Appendix B Page B-3 Name Reference
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