Questions about mk-41 vls, sylver vls and spg-62 radars

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Totoro

New Member
Anyone have some data which is not complete guesswork (guesstimations based on good logic are welcome) concerning the following things:

1.
Against an incoming harpoon missile, with all the manouvering it does on approach, how long does a single spg-62 radar illuminator need to keep illuminating a single harpoon target, so a sm-2 or an ESSM can hit it? I know such a thing probably depends on many different things, but i'm looking for the minimum time and an average, realistic war situation figure where spg-62s need to move their beam from one target to the next.

2.
Mk-41 and Sylver VLS launchers. What is the fastest possible firing rate they can achieve, respecitvely? and, if it depends on the type of missile fired, then how much time would each launcher take to fire two of: sm-2, ESSMs, aster 15 and aster 30? (obviously, first two for mk41, and asters for sylver)

As a bonus question, what is fastest possible firing rate for the RAM system?

Thank you. :)
 
D

DoC_FouALieR

New Member
Concerning the firing rate of the Sylver VLS, I remember a test made at one of our missile test pit where 6 Aster 15 were launched in approx. 1 seconds
 
C

contedicavour

New Member
Grand Danois said:
I think 150 ms is the right number. ;)

Do you have any info on the dimensions and weight of the Sylvers, by the way?
Click to expand...
I know that the A70 Sylver is 8.15 meters high to house Scalp Naval.
The weight of a Scalp being 1.4 tonnes, a A70 module of 16 VLS must weigh a bit more than 16x1.4=22.4 tonnes to allow for the structure's own weight.

cheers
 
T

Totoro

New Member
  • Thread Starter Thread Starter
  • #6
Well, thanks for that picture. If it hasn't been doctored, it could be a proof. I've come upon the 150ms figure before but i've also seen various other figures likes 8 missiles in 10 seconds, so couldn't be sure. But this way, with very fast fire, active guidance and seemingly advanced missile - i'd say PAAMS gives best antiship protection possible.

So, how about those other, unanswered, questions? rate of fire for Mk-41 and RAM, and especially the spg-62/essm info. Anyone have any ideas?

Off topic, is there an another version of aster planned for A70 launcher? with 8 meters of length, one could easely cram inside a 200-400 km range SAM.
 
S

stuuu28

New Member
Picture

I think that picture is of one launch using a time elapse camera if im not mistaken ( good chance i am though :p)
 
T

tatra

New Member
Verified Defense Pro
Totoro said:
Anyone have some data which is not complete guesswork (guesstimations based on good logic are welcome) concerning the following things:

1.
Against an incoming harpoon missile, with all the manouvering it does on approach, how long does a single spg-62 radar illuminator need to keep illuminating a single harpoon target, so a sm-2 or an ESSM can hit it? I know such a thing probably depends on many different things, but i'm looking for the minimum time and an average, realistic war situation figure where spg-62s need to move their beam from one target to the next.
Click to expand...
HOMING GUIDANCE.—Homing guidance systems control the path of the missile by means of a device in the missile that detects and reacts to some distinguishing feature of (or signal from) the target. This may be in the form of light, radio, heat, sound waves, or even a magnetic field. The homing missiles use radar or RF waves to locate the target while air-to-air missiles sometimes use infrared (heat) waves. Since the system tracks a characteristic of the target or energy reflecting off the target, contact between the missile and target is established and maintained. The missile derives guidance error signals based on its position relative to the target. This makes homing the most accurate type of guidance system, which is of great importance against moving air targets. Homing guidance methods are normally divided into three types:, active homing, semi-active homing, and passive homing (fig. 1-21).

http://tpub.com/content/fc/14099/img/14099_28_1.jpg
Figure 1-21.—Homing guidance: A. Active homing; B. Semi-active homing; C. Passive homing

Semiactive Homing.
In a semiactive homing system, the target is illuminated by a transmitter (an illuminator) on the launching site (fig. 1-21, view B). As with active homing, the transmitted RF is reflected by the target and picked up by the missile’s receiver. The fact that the transmitter’s size is not limited, as with active homing, allows a much greater range.The missile, throughout its flight, is between the target and the radar that illuminates the target. It will receive radiation from the launching ship, as well as reflections from the target. The missile must therefore have some means of distinguishing between the two signals, so that it can home on the target rather than on the launching ship. This can be done in several ways. For example, a highly directional antenna may be mounted in the nose of the missile; or the Doppler principle may be used to distinguish between the transmitter signal and the target echoes. Since the missile is receding from the transmitter and approaching the target, the echo signals will be of a higher frequency. Most SMS missiles use both of these methods. A drawback of this system is that the shipboard illumination is not free to engage another target while the missile is in flight. STANDARD SM-1 and SEA- SPARROW all use semi-active homing as their primary guidance; they do not use midcourse guidance. The STANDARD SM-2 uses midcourse guidance, and then semi-active homing only for terminal guidance. As a result, the SM-2 needs illumination from the ship only for the last few seconds of flight.

http://tpub.com/content/fc/14099/css/14099_26.htm
 
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T

Totoro

New Member
  • Thread Starter Thread Starter
  • #10
I keep reading the same thing in various articles, 'last few seconds of flight'. but just what exactly does that mean? 2 seconds? 4 seconds? 6 seconds? It makes a huge difference. And how much would a type of missile intercepted influence that? if a missile is going straight toward the ship, would the illuminator need 20% of those 'few seconds' or 80% of the said time period or something in between?
 
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