Ship Defense

The Navy’s trend in ship design has been towards lighter and lighter built ships with less and less defensive capabilities.  Well, let’s step in and put a stop to that!  Since the Navy clearly doesn’t know how to design a ship with defensive capabilities, let’s do it for them.
 
We’re all familiar with the concept of a carrier group’s layered defense.  Aircraft provide wide ranging defense against search aircraft and provide the initial defensive layer against an attack.  Standard missiles offer the possibility of very long range intercepts.  Escort ships range dozens of miles out to provide extended ASW and AAW protection.  Medium range defense is provided by closer escorts and medium range defensive missiles.  Various missiles, electronic warfare systems, and CIWS provide close in defense.
 
Similarly, an individual ship’s defense should consist of more – much more! – than just Standard/ESSM missiles and one or two RAM/SeaRAM, as the Navy seems to believe.  A ship’s defense should be a multi-faceted, layered construct.  Let’s consider the individual components.
 
 
Outer Layer
 

• UAVs – small, stealthy, wide ranging UAVs providing passive aerial sensor coverage
• Standard Missiles – long range anti-air defense
• Passive Sonar – long range detection
• EO/IR – long range visual and infrared detection integrated into a 360 deg hemispherical sensor system
• ESM – very long range signals analysis (Outboard/COBLU and S-3 Shadow type sensing) providing detection and triangulation
• Stealth – do all the above without, in turn, being detected

 
Middle Layer
 

• EO/IR - medium range visual and infrared detection integrated into a 360 deg hemispherical sensor system combined with fire control
• ESSM – medium range anti-air defense
• EW/ECM – detection, jamming, spoofing, etc.
• Stealth – do all the above without, in turn, being detected

 
Inner Layer
 

• EW/ECM – point defense jamming, spoofing, etc.
• RAM/SeaRAM – close in anti-air defense
• CIWS – close in anti-air defense
• Decoys – integrated into Aegis
• Stealth – do all the above without, in turn, being detected

 
 
A few supplementary comments are warranted:
 
Sensors – 360 degree EO/IR with targeting capability (IRST) in addition to supplement and largely replace radar.  Such a system would involve far more than the current one EO sensor on ships today.  This would be several, perhaps dozens, of sensors each scanning a portion of the sky and acting as a single, integrated system.  During war, this may actually be the main sensor system so that the ship doesn’t have to radiate.
 
UAVs – This has been posted on previously.  Every ship should sail with several dozen small, stealthy, passive UAVs for establishing situational awareness.  These are cheap and expendable.  They must be stealthy.  It’s pointless to try to establish situational awareness if doing so gives away your own position.  We must be able to see without being seen.
 
Long range missiles – I hesitate to even include long range missiles as I believe their use will be quite limited, bordering on never.  No enemy is going to present high altitude targets other than ballistic missiles which are a special case.  So many people forget that long range missiles can only engage high altitude targets because of the radar horizon limitation.  Beyond the radar horizon, radar can only see targets at altitude. 
 
Close In – Attackers will get through.  It’s guaranteed.  Even in scripted exercises, they always do.  Every ship should have several to dozens of close in weapon systems instead of the nearly useless single (or no!) close in weapon on today’s ships.
 
Inner Layer - The inner layer has the most components and yet the Navy devotes the least amount of effort and resources to it.  The Zumwalt has no close in weapons.  The DDG(X) concept graphic has only two RAM launchers for close in defense.  The Burkes have only one CIWS.
 
EW/ECM is the most common and, historically, the most effective anti-air component and yet the Navy devotes very little attention or resources to it.  Even the current SEWIP upgrades are a limited effort, poorly executed.
 
Focus - So, what does the Navy focus its attention and resources on?  That’s right, the most expensive and least likely to be used component:  long range missiles.