JED - September 2014 - (Page 50)

EW 101 Saturation Decoys Radar Decoys - Part 3 By Dave Adamy THE RADAR RESOLUTION CELL The Journal of Electronic Defense | September 2014 50 At this point, let's take a moment to discuss the radar resolution cell. This is the spacial volume in which the raHALF PULSE dar cannot determine whether there is 3 dB beamwidth RADAR DURATION a single target or multiple targets. FigRESOLUTION (x SPEED OF LIGHT) ure 1 shows this in two dimensions for CELL simplicity, but it is actually three dimensional, comprising a range "slice" of the conical volume within the antenna's Figure 1: The radar resolution cell is the volume in which the radar cannot determine if there is beam width. The dimensions of the resoonly one target or multiple targets. lution cell are normally calculated as: there is only one target or multiple targets. * ross range resolution = R x 2cos(BW/2) C o Where R is the range to the target Anti-ship from the radar and BW is the radar Decoy missile with antenna's 3-dB beam width. Active Guidance * own range resolution = c x PW/2 D o Where c is the speed of light and PW is the radar's pulse width For CW radars, the down range resolution is calculated from the same formula, but with the radar's coherent processing Decoy interval replacing pulse width. In the August 2010 "EW 101" column, two techniques for improving the range Figure 2: Distraction decoys create many false targets to overload the capability of a target sensor resolution (chirp and barker code) were or of the weapons it controls. Figure 2: Distraction decoys create many false targets to overload the discussed. We will review these techcapability board radar will acquire a it controls. niques in a future column. At this point, note that these tech-of a target sensor or of the weaponstarget as shown in Figure 3. This acquisition range depends on the type of missile and the type niques along with some multi-pulse techniques can reduce the of target, but will typically be ten to twenty five kilometers. effective size of the resolution cell. SHIPBOARD SATURATION DECOYS Last month, we discussed distraction decoys used to protect aircraft. Active or passive decoys can be used to protect ships from anti-ship missiles. As shown in Figure 2, decoys with about the same radar cross section as the ship being protected can be placed in a pattern around the ship. When an anti-ship missile is fired at a ship from an aircraft, a ship or a shore-based site, it will be inertially guided to the location at which the ship was detected. Then, when the missile comes within radar range, its on- Missile guided inertially Missile guided by on-board radar Hostile aircraft launches missile Ship is within missile radar range Figure 3: An anti-ship missile is launched from long range. It is inertially guided to a ship's general location. When within radar range, its on-board radar guides it to the target. Figure 3: An anti-ship missile is launched from long range. It is guided to ship general location. When within radar range, its on-board radar guides it to the target.

Table of Contents for the Digital Edition of JED - September 2014

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
Washington Report
World Report
I2WD – Driving Next Generation Army EW and Cyber Technology Into the Future
Technology Survey: Communications Jammers and Rcied Jammers
EW 101
AOC Convention Guide
Index of Advertisers
JED Quick Look

JED - September 2014

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