RTCA規格 DO-366, Revision A, 2020: Minimum Operational Performance Standards (MOPS) for Air-to-Air Radar for Traffic Surveillance

Description

Introduction
This document is the Revision A update to the Minimum Operational Performance Standards (MOPS) for Air-To-Air Radar (ATAR) for Traffic Surveillance (RTCA Document 366 (DO-366)), referenced as RTCA DO-366A. The new ATAR specifications were derived to meet the non-cooperative sensor requirements for Detect and Avoid (DAA) systems as described in RTCA DO-365B. They include support for multiple classes of aircraft and include collision avoidance functions as described in the MOPS for Airborne Collision Avoidance System Xu (ACAS Xu), RTCA DO-386. These standards specify the radar system characteristics that should be useful for designers, manufacturers, installers and users of the equipment.

Compliance with these standards is recommended as one means of assuring that the equipment will perform its intended function(s) satisfactorily under the conditions specified herein. Any regulatory application of this document is the sole responsibility of appropriate governmental agencies.

Section 1 of this document provides information needed to understand the rationale for the equipment characteristics and requirements in Section 2. It describes typical equipment operations and operational goals as envisioned by the members of RTCA Inc. Special Committee (SC)-228, and establishes the basis for the standards stated herein. Definitions and assumptions essential to proper understanding of this document are also provided in this section.
Section 2 contains the requirements for the equipment. These standards specify the required performance under standard environmental conditions. Also included are recommended bench test procedures necessary to demonstrate equipment compliance with the stated minimum requirements.
Section 3 describes the performance required of installed equipment. Tests for the installed equipment are included when performance cannot be adequately determined through bench testing.
Section 4 contains aircraft operational performance characteristics.
Section 5 contains an informative listing of SC-228 committee members who contributed to these MOPS.

Appendix A contains information on the proposed frequency bands for the radar, and their regulatory status.
Appendix B contains analysis and simulations that derive the required maximum range for the Class B radars (ACAS Xu) for different categories of intruders and different encounter geometries between the ownship and intruders.
Appendix C defines the conversion between the radar natural coordinate system and the coordinate system in Class B (ACAS Xu) radars.
Appendix D provides information on the tracker required for Class B (ACAS Xu) radars, its description, equations and performance.
Appendix E provides results of simulations to estimate the Radar Cross-Section (RCS) of different kinds of aircraft as guidance for radar design against expected intruders.
Appendix F – Reserved.
Appendix G provides validation of the Radar Declaration Range (RDR) against DAA alerting requirements for Class A1 and A2 (Non-ACAS Xu, large and medium ownship).
Appendix H provides validation of the RDR against DAA alerting requirements for Class A3 (Non-ACAS Xu, small ownship).
Appendix I analyzes the frequency of the cases where an intruder enters the radar Field of Regard (FOR) within the RDR for Class A1 and A2
Appendix J analyzes the frequency of the cases where an intruder enters the radar FOR within the RDR for Class A3.
Appendix K contains analysis and simulations that derive the required maximum range for Class A radars (Non-ACAS Xu) for different categories of intruders and different encounter geometries between the ownship and intruders.
Appendix L provides a list of acronyms and abbreviations used in this document.
Appendix M contains two matrices; one for tracing Requirements to Test Procedures and one for tracing Test Procedures to Requirements.

This document sets performance standards for ATAR for traffic surveillance as part of a DAA system to satisfy non-cooperative surveillance requirements. Separate MOPS were developed for the DAA system.¹ This version of the ATAR MOPS, DO-366A, supports the ATAR functions described in DO-365B and the ACAS Xu MOPS. The earlier version, DO-366, supports the ATAR functions described in DO-365 and DO-365A. The radar basic functions, e.g., power ON/OFF, transmit power ON/OFF, are controlled by the remote pilot in the Control Station (CS). Similarly, the radar provides its status to the CS during operation. The CS sends commands to the radar and receives status from it. Tracks generated by the radar are sent to the DAA system for further processing.

¹ Minimum Operational Performance Standards (MOPS) for Detect and Avoid (DAA) Systems, RTCA DO-365B