JED - January 2010 - (Page 37)

TECHNOLOGY SURVEY SURFACE NAVAL EXPENDABLES AND LAUNCHERS By Ollie Holt The Journal of Electronic Defense | January 2010 The Journal of Electronic Defense | January 2010 T his month’s survey focuses on Surface Naval Expendables and Launchers. JED has provided past surveys and articles on airborne expendables (fl ares, RF decoys and chaff) and airborne dispensers. This survey addresses the surface naval variants of RF and IR decoys and their launchers. Surface Naval forces have a larger problem than ground or airborne platforms because they sit on a flat, wide-open area with only two degrees of freedom of movement and on a cold surface relative to the temperature of the ship. This makes surface ships more vulnerable to active RF, homing RF and IR missiles. The threat is the modern Anti Ship Missile (ASM or AShM). These missiles are fast, deadly and accurate. Typical times from launch to impact range from 120 to 150 seconds for the typical ASM and 25 to 30 seconds for the faster missiles. These missiles can be launched from the air, surface and subsurface. They can be guided by radar, IR or Electro Optical homing devices. They are usually sea skimming, but can also be high diving. Decoys first contribute to ship self-defense with detection avoidance. In an RF scenario, for example, chaff is usually used to offer the adversary’s radar realistic but false targets in number. Chaff rounds are launched, usually by missiles, to get them a good distance away (1 to 5 km or even further) from the ship. The missile then can dispense multiple chaff bundles, each one creating a chaff cloud that offers the radar with a more attractive target than the ship. As long as the ship can create a state of confusion for the adversary’s sensors, it can deny or delay the missile launch and provide much-needed time to either move out of range or mount its own missile attack. If the ship detects an incoming ASM, it can employ antimissile missiles to try to destroy the incoming ASM or it can use decoys to distract the missile during its search phase. If the incoming missile is a homing missile, it will try to lockon to either an IR or RF emission from the target. The ship can use chaff, flares or RF decoys to create a distraction that is more enticing than the ship. One of these RF decoys, the Nulka, is rather interesting because it simulates the ship’s RF emissions as it slowly moves away from the ship and attracts the incoming RF homing missile – drawing it away from the ship, which at that point will have stopped all RF emissions. The final stage uses IR and chaff to deny the missile range to the target and tries to get the missile to drop into the water before it reaches the ship. Also in the final stages, high-rate-of-fire guns are used to shoot the missile down before reaching the ship. This survey contains a mixture of decoy technologies including RF chaff, RF reflectors, active RF devices along with IR, EO and laser decoys. Some are just for endgame situations, while others are in support of confusion and distraction techniques to deny launch or target acquisition after launch. The survey also includes some shipboard launchers that can be configured for different types of decoy rounds. This survey was performed following the same process as previous surveys with a set of questions sent to suppliers of surface naval expendables and launcher technologies. These companies were asked to provide information for up to five of their products for inclusion in this survey. Only information supplied by the survey respondents was used in this compilation. JED’s next survey, covering TWTs and MPMs, will appear in March 2010. E-mail to request a survey questionnaire. 37 37

Table of Contents for the Digital Edition of JED - January 2010

JED - January 2010
The View From Here
From the President
The Monitor
Washington Report
World Report
Asia-Pacifi c EW: All Eyes on China?
Maneuver in the EM Domain
Technology Survey: Surface Naval Expendables and Launchers
EW 101
AOC Industry/Institute/University Members
Index of Advertisers
JED Sales Offices

JED - January 2010