AC – Alternating Current AESA – Active Electronic Scanned Array AMRAMM – Advanced Medium Range Air-to-Air Missile AOJ – Acquire on Jam AZ – Azimuth BSC – Binary Symmetric Channel BW – Beam Width BW – Bandwidth CFAR – Constant False Alarm Rate CG– Guided Missile Cruiser COMINT – Communications Intelligence CPA – Closest Point of Approach CW – Continuous Wave CWI – Continuous Wave Illumination DC – Direct Current DC – Duty Cycle DDG – Guided Missile Destroyer DFRM – Digital Radio Frequency Memory EA – Electronic Attack (formally ECM – Electronic Counter Measures) EC – Electronic Combat (formally EW – Electronic Warfare) EHF – Extremely High Frequency EL – Elevation ELF – Extremely Low Frequency ELINT – Electronic Intelligence EM – Electro-Magnetic EMCON – Emission Control EP – Electronic Protect (formally ECCM – Electronic Counter Counter Measures) ERP – Effective Radiated Power ES – Electronic Support (formallyESM – Electronic Support Measures) ESA – Electronically Scanned Array FC – Fire Control FMCW – Frequency Modulated Continuous Wave FFG – Guided Missile Frigate FTC – Fast Time Constant GCI – Ground Control Intercept GPS – Global Positioning System HARM – High Speed Anti-Radiation Missile HAS – High Aspect Search HF – High Frequency HF-DF– High Frequency Direction Finding HOJ – Home-on-Jam IF – Intermediate Frequency IR – Infar-Red LF – Low Frequency LO – Local Oscillator LOS – Line of Sight LUF – Lowest Useable Frequency MDS – Minimum Discernable Signal MF – Medium Frequency MFR – Multi-Functional Radar MSA – Mechanically Scanned Array MTT – Multi Target Track MTI – Moving Target Indicator MUF – Maximum Usable Frequency NEP – Noise Equivalent Power OFT – Optimum Frequency for Transmission PCR – Pulse Compression Ratio PD – Pulse Doppler PESA – Passively Electronic Scanned Array PPI – Plan Position Indicator POI – Probability of Intercept PRF –Pulse Repetition Frequency PRI – Pulse Repetition Interval PW – Pulse Width PRI – Pulse Repetition Interval PRT – Pulse Repetition Time Rx – Receiver RADAR – Radio Detection and Ranging RCS – Radar Cross Section RF – Radio Frequency RGPO – Range Gate Pull Off RT – Rest Time RWR – Radar Warning Receiver Smin – Minimum signal for Detection SAR – Synthetic Aperture Radar SHF – Super High Frequency SIGINT – Signal Intelligence SNR – Signal to Noise Ratio S/N – Signal over Noise SRBOC – Super Rapid Blooming Offboard Countermeasures SSES – Ships Signals Exploitation Space STC – Sensitivity Time Control SM-2 – Standard Missile type 2 STAP – Space Time Adaptive Processing Tx – Transmitter TALD – Tactical Air Launch Decoy TL – Threshold Level TLAM – Tomahawk Land Attack Missile TOW – Tube Launched Optically Tracked Wire Guided TVM – Track Via Missile UHF – Ultra High Frequency VGPO – Velocity Gate Pull Off VHF – Very High Frequency VLF – Very Low Frequency