ASSAP Track Coasting - Federal Aviation Administration - Home ...

ASSAP Track Coasting
• How long can an ADS-B based track be
coasted?
– Minimum NACp required for applications
– Extrapolated aircraft position may be incorrect due
to maneuver
– Need to determine when to stop trusting coasted
track
• Choose possible stressful maneuver
• Determine when NACp < NACpmin October 2, 2007 Federal Aviation
1
Administration

Animation…
NACp=5; aTurn=1g; Vel = 200kts
October 2, 2007 Federal Aviation
2
Administration

Disjoint Time [s]
Run #1: NACp =5; aTurn=1g;
Vel = 100:600 kts
17
16.5
16
15.5
15
14.5
14
Disjoint Time as a function of Tangential Velocity
13.5
100 150 200 250 300 350 400 450 500 550 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
3
Administration

Disjoint Time [s]
Run #2: NACp =9; aTurn =1g;
Vel = 10:150kts
5
4.5
4
3.5
3
2.5
Disjoint Time as a function of Tangential Velocity
2
0 50 100 150
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
4
Administration

Disjoint Time [s]
Run #1.1: NACp =1; aTurn =1g;
Vel = 10:10:600kts
3000
2500
2000
1500
1000
500
Disjoint Time as a function of Tangential Velocity
66.8s
0
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
5
Administration

Disjoint Time [s]
Run #1.2: NACp =2; aTurn =1g;
Vel = 10:10:600kts
1200
1000
800
600
400
200
Disjoint Time as a function of Tangential Velocity
40.0s
0
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
6
Administration

Run #1.1: NACp =3; aTurn =1g;
Vel = 10:10:600kts
Disjoint Time [s]
600
500
400
300
200
100
Disjoint Time as a function of Tangential Velocity
28.0s
0
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
7
Administration

Run #1.1: NACp =4; aTurn =1g;
Vel = 10:10:600kts
Disjoint Time [s]
300
250
200
150
100
50
Disjoint Time as a function of Tangential Velocity
19.7s
0
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
8
Administration

Run #1.1: NACp =5; aTurn =1g;
Vel = 10:10:600kts
Disjoint Time [s]
140
120
100
80
60
40
20
Disjoint Time as a function of Tangential Velocity
14.0s
0
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
9
Administration

Run #1.1: NACp =6; aTurn =1g;
Vel = 10:10:600kts
Disjoint Time [s]
80
70
60
50
40
30
20
Disjoint Time as a function of Tangential Velocity
10.9s
10
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
10
Administration

Run #1.1: NACp =7; aTurn =1g;
Vel = 10:10:600kts
Disjoint Time [s]
30
25
20
15
10
Disjoint Time as a function of Tangential Velocity
6.4s
5
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
11
Administration

Disjoint Time [s]
Run #1.1: NACp =8; aTurn =1g;
Vel = 10:10:600kts
14
13
12
11
10
9
8
7
6
5
Disjoint Time as a function of Tangential Velocity
4.35s
4
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
12
Administration

Run #1.1: NACp =9; aTurn =1g;
Vel = 10:10:600kts
Disjoint Time [s]
5
4.5
4
3.5
3
2.5
Disjoint Time as a function of Tangential Velocity
2.477s
2
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
13
Administration

Disjoint Time [s]
Run #1.1: NACp =10; aTurn =1g;
Vel = 10:10:600kts
1.85
1.8
1.75
1.7
1.65
1.6
1.55
1.5
1.45
Disjoint Time as a function of Tangential Velocity
1.4310s
1.4
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
14
Administration

Disjoint Time [s]
Run #1.1: NACp =11; aTurn =1g;
Vel = 10:10:600kts
0.815
0.81
0.805
0.8
0.795
0.79
0.785
Disjoint Time as a function of Tangential Velocity
0.7827s
0.78
0 100 200 300 400 500 600
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
15
Administration

Disjoint Time [s]
70
60
50
40
30
20
10
Summary – Disjoint Time vs.
NAC
Disjoint Time [s] as a function of NAC
0
0 2 4 6
NAC
8 10 12
NAC Disjoint Time [s]
1 66.8
2 40
3 28
4 19.7
5 14
6 10.9
7 6.4
8 4.35
9 2.477
10 1.431
11 0.7827
October 2, 2007 Federal Aviation
16
Administration

Disjoint Time [s]
Run #2.1: NACp =8; aTurn =.2g;
Vel = 10:5:100kts
15
14
13
12
11
10
Disjoint Time as a function of Tangential Velocity
9.76s
9
10 20 30 40 50 60 70 80 90 100
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
17
Administration

Disjoint Time [s]
Run #2.2: NACp =9; aTurn =.2g;
Vel = 10:5:100kts
6.3
6.2
6.1
6
5.9
5.8
5.7
5.6
Disjoint Time as a function of Tangential Velocity
5.56s
5.5
10 20 30 40 50 60 70 80 90 100
Tangential Velocity [kts]
October 2, 2007 Federal Aviation
18
Administration

Status
• Coast time dependent on:
– Target velocity
–NACpmin for application
• How do we want to proceed?
October 2, 2007 Federal Aviation
19
Administration