Fuzing Challenges for Guided Ammunition

20 Pages·2016·2.37 MB·English

by  Simone Oliva

59TH ANNUAL FUZE CONFERENCE
MAY 3 - 5, 2016 CHARLESTON, SC
Fuzing Challenges for Guided
Ammunition

Finmeccanica Defence Systems Division - Approved for public release
Introduction: Finmeccanica Guided Ammunition

DART (Driven Ammunition
Reduced Time-of-flight)
Fired by Naval 76/62 guns
VULCANO ammunition family
Guided and unguided versions for:
d
e
v
• 76mm (Naval gun) er
s
e
s r
• 127mm (Naval gun) ht
g
All ri
• 155mm (Land Artillery) –
A.
p.
Multiple configurations with: a S.
c
ni
a
 RF fuze cc
e
m
n
 IR seeker 6 Fi
1
0
2
 SAL seeker ©

Finmeccanica Defence Systems Division - Approved for public release 2
Introduction: Finmeccanica Guided Ammunition
DART ammunition
Naval inner layer defence system
against high manoeuvring air
and surface targets


Sub-caliber

RF beam-guided in Line of Sight

Free rolling, fin stabilized
d
projectile e
v
er
s
e
 CANARD section roll and pitch hts r
g
controlled All ri
–
A.
 Very high manoeuvrability a S.p.
c
ni
a
 RF proximity fuze ecc
m
n
Fi
 6
Fired from 76/62 guns with 01
2
©
STRALES guidance system
Finmeccanica Defence Systems Division - Approved for public release 3
Introduction: Finmeccanica Guided Ammunition
Vulcano ammunition family
Vulcano BER: Ballistic, Extended Range
Vulcano GLR: Guided, Long Range
- GPS/IMU configuration with RF fuze
- Configuration with IR seeker
- Configuration with SAL seeker

d
e
v
Different possible roles, depending er
s
e
s r
on calibre and configuration: ht
g
All ri
- Long range fire support A. –
p.
S.
- Anti-ship ca
ni
a
c
c
e
- Anti-air m
n
Fi
6
1
0
2
©
Finmeccanica Defence Systems Division - Approved for public release 4
Introduction: Finmeccanica Guided Ammunition
Vulcano Guided Long Range subsystems
Inertial Measurement Unit
GPS
Guidance Unit
Power supply unit
FUZE, or
IR or SAL
Stabilizing Tail sensor
Pre Fragmented Warhead
d
e
v
er
s
e
Control s r
ht
g
Actuation All ri
–
System A.
p.
S.
GPS antenna a
c
ni
a
c
c
e
m
n
Fi
6
1
0
2
©
Finmeccanica Defence Systems Division - Approved for public release 5
5
Fuze Design Challenges for GUIDED SUB-CALIBRE
ammunitions

Environmental Challenges New required functions

More programmability,
to achieve more
versatility
d
e
v
er
s
e
s r
ht
g
New functional modes, All ri
–
A.
for guidance support p.
S.
a
c
ni
a
c
c
e
m
n
Fi
6
1
0
2
©
Finmeccanica Defence Systems Division - Approved for public release 6
New Environmental Challenges
Harsh ElectroMagnetic (EM) environment – Issues
“Standard” disturbance sources:
- Own Radar systems (now also including
RF guidance systems)
- Enemy Radar systems
- Intentional Jammers
New internal disturbance sources:
d
e
v
- Electric disturbance from other electronic er
s
e
s r
circuits ht
g
All ri
–
- Disturbance from electric motors (via PWM A.
p.
S.
control signals, and peak current a
c
ni
a
absorptions) cc
e
m
n
Fi
- Disturbance from the actual movements of 6
1
0
2
guidance fins, located near the Doppler ©
sensor
Finmeccanica Defence Systems Division - Approved for public release 7
New Environmental Challenges
Harsh ElectroMagnetic (EM) environment – HW solution approach
Hardware solutions for the elimination, or
the reduction, of both the electrical and
mechanical disturbance:
 Selection of electronic components
introducing less disturbance in the
circuitry (typical disturbing components to
be chosen with care are: microprocessors,
clock generators, digital communication d
e
v
er
s
drivers, PWM signals for electric motors…) e
s r
ht
g
 Use of electronic filters to reduce the All ri
–
disturbance toward the RF sensor p.A.
S.
a
c
 Electric isolation of guidance fins ani
c
c
e
m
Fin
6
1
0
2
However, some disturbance is always ©
present…
Finmeccanica Defence Systems Division - Approved for public release 8
New Environmental Challenges
Harsh ElectroMagnetic (EM) environment – SW solution approach
Necessity of new algorithm features, in order to:
- Recognising in flight all the described disturbance
- Discriminating the disturbance from the real target Doppler or sea Clutter
signals
- Maintaining good reliability in the presence of a disturbed EM environment

A good way to achieve this goal is to use of a Frequency Modulation of the RF ed
v
er
s
signal, enabling: s re
ht
g
- More robust target detection All ri
–
A.
p.
- Target distance measurement S.
a
c
ni
a
- Continuous computation of c
c
e
m
n
Fi
“time-to-go” before intercept 6
1
0
2
©
Finmeccanica Defence Systems Division - Approved for public release 9
New Environmental Challenges
Increase of set-back acceleration
Sub-calibre projectiles
Higher set-back
feature higher muzzle
acceleration!
velocity
All the fuze components, new or
DART set- d
already used in old full calibre ve
er
s
back up to fuzes, have been tested with gun s re
ht
g
40,000g! hardening trials (laboratory and All ri
–
A.
firing tests) p.
S.
a
c
ni
a
c
c
e
m
n
Fi
6
1
0
2
NOTE: in-barrel lateral accelerations are also greater than for full calibre! ©
Finmeccanica Defence Systems Division - Approved for public release 10