||Traffic Alert and Collision Avoidance System for Military Aircraft using ADS-R
||Department of Aeronautics & Astronautics (on the job class)
Civil aircraft, especially general aviation, operating in the same airspace as military aircraft, have been brought in safety concerns for many years. Collision avoidance technology should be applied into wider varieties of aircraft including military aircraft, general aviation (GA) and unmanned aerial vehicle (UAV). The existing surface radar technology often has limi-tations by its speed and coverage. Since Automatic Dependent Surveil-lance-Broadcast (ADS-B) provides better surveillance in fringe areas of radar coverage, it also does not have the siting limitations of radar. ADS-B could replace radar as the primary surveillance method for controlling aircraft worldwide. A wider concept of ADS-B application into collision avoidance system for all aircraft is proposed in this thesis. Integrating the concept of Automatic Dependent Surveillance- Rebroadcast (ADS-R) and Traffic Alert and Collision System (TCAS) into military aircraft for active collision avoidance. The Air Traffic Control (ATC) will collect the data from UAV, UAT and commercial airline before reporting to the military aircraft. Because military aircraft have high confidentiality, they do receive data from ATC but no replies. Under the Visual flight rules (VFR), mili-tary aircraft with higher maneuverability gets lower priority. So, military aircraft should perform active avoidance to give way to all kind of aircraft. For avoiding the collision, the research focus on some restrictions of mili-tary aircraft maneuverability and the algorithm for resolution path. The purpose of the research is creating a high-quality and changing the con-ventional system for both military aircraft and civil aircraft. This feature may be helpful and useful for military aircraft.
LIST OF TABLES VII
LIST OF FIGURES VIII
1.1 Motivation 1
1.2 Main Idea 1
1.3 Literature Survey 3
1.4 Thesis Outline 4
RESEARCH BACKGROUND 5
2.1 Airspace 5
2.2 TCAS Overview 7
2.2.1 TCAS III 7
2.3 ADS-Broadcast 7
2.3.1 ADS-B In 8
2.3.2 ADS-B Out 8
2.4 TCAS/ADS-B Integrated Surveillance System 8
2.5 ADS-Rebroadcast 9
2.6 IFF (military) 9
2.6.1 Mode 1 10
2.6.2 Mode 2 11
2.6.3 Mode 3 / Mode C 11
2.6.4 Mode 4 11
2.7 Radar (military) 12
2.8 Remarks 13
METHODOLOGY AND SYSTEM ANALYSIS 14
3.1 ADS-R Service for Military Aircraft Based on TCAS 14
3.2 TCAS Computer Unit for Military Aircraft 15
3.2.1 ADS-R Link Sensor 16
3.2.2 Antenna 16
3.3 Cockpit Display 17
3.4 Remarks 18
SYSTEM MODELING AND SOLUTION ALGORITHM 19
4.1 Flight Priority and Rules 19
4.2 Centripetal Force and Bank Angle 22
4.3 Collision Avoidance Concepts 25
4.3.1 Definition of Conflict 26
4.3.2 Separation Bubble 26
4.3.3 Sensitivity Level 27
4.4 Collision Avoidance Logic Function 28
4.5 Remarks 31
5.1 Detection Process 32
5.2 Traffic Alert 32
5.2.1 Non-Relative-Vertical Velocity 33
5.2.2 Having-Relative-Vertical Velocity 35
5.3 Resolution Advisory 37
5.3.1 Horizontal Escape Maneuver with Changing Heading 37
5.3.2 Horizontal Escape Maneuver With Changing Speed 40
5.4 System Flow Chart 41
6.1 Conclusion 44
6.2 Future Work 44
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