Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

crude initialisation introduces errors that are initially outside expectation
that take upwards of 4 s to decay.
TG_P_MET [metres]
TG_V_MET [m/sec]
11
10
9
8
7
6
5
4
3
2
1
10 12 14 16 18 20 22 24 26 28 30
TIME [seconds]
4
3.5
3
2.5
2
1.5
1
0.5
T3_IMQV10.MTB
T3_IMQV03.MTB
T3_IMQV01.MTB
T3_IMQV0Q.MTB
9-25
T3_IMQV10.MTB
T3_IMQV03.MTB
T3_IMQV01.MTB
T3_IMQV0Q.MTB
0
10 12 14 16 18 20 22 24 26 28 30
TIME [seconds]
Figure 9-43
Velocity Filter - Position and Velocity Errors, ( PIP ) and ( PIV )
The gradual reduction in the errors, and the improvement in observability as
indicated by the CN, is due to the relative position of the target with respect
to the radar. The closest approach to the radar occurs at approximately 30 s
when range-rate measurements are most effective.
The velocity filter position error when tracking a target performing a “U”
turn designed for Singer filter tuning is shown in Figure 9-45. Although the
performance is poor the velocity filter by remains stable.