ESM (Electronic Support Measures)

ESM system function, or also called Electronic Warfare (EW) Receiver, is to identify and determine the direction (Angle of Arrival / AoA) electromagnetic emission emitted opponent electronic devices, such as radar, communications equipment, missiles, etc.. An ESM system generally consists of ESM Receiver, Processor and Direction Finder (DF). ESM Receiver serves as a sensor to detect and measure electromagnetic emissions, and the results are then forwarded to the processor that serves to identify the detected signal. The DF is used to determine the direction of the emission beam. ESM system is designed to operate as a Naval ESM system, namely the use of ESM systems optimized for the needs of the Navy, especially in warships. Systems for domestic ESM was developed by Dislitbangal for 3 years from 2010 to 2012.


The main function of Naval ESM system that has been developed is to identify and determine the direction (Angle of Arrival / AoA) electromagnetic emission emitted opponent electronic devices, including radar, communications equipment, missiles and jammer. Sources of these emissions can be derived from various types of vehicles, such as ships, submarines, aircraft, satellites, missiles, etc..
Results of the identification signal is detected and the direction of the signal is used to determine the types of threats that may be posed, so anticipation can be done to overcome them. The identification process is carried out by processing in computer software.


ESM device applications in the military is very spacious, with advances in technology and changing paradigms of hard attack warfare systems, electronic attack to attack soft or commonly referred to as electronic warfare, where ESM is very useful to detect the use spectrum opponents, can be implemented to analyze the spectrum of war / electronic warfare against opponents.Other applications that store data leads to the spectrum of the Ajan is stored in the form of library that will be analyzed and used by other equipment.

Measures Capability

  • Radio Frequency (RF)
  • Amplitude (power)
  • Direction of Arrival (DOA) also called Angle of Arrival (AOA)Time of Arrival (TOA)
  • Pulse Repetition Interval (PRI)
  • PRI TypePulse Width (PW)
  • Scan type and rate
  • Lobe duration (beam width)
  • Receiver Type : Crystal Video Detector (CVD)
  • Frequency range : 2-18 Ghz
  • Unambiguous Bandwidth :16 Ghz
  • Sum of bits : 12
  • Frequency Resolution : 4.5 Mhz
  • Frequency Accuracy : 6 Mhz
  • Minimum input signal power : -60 dBm
  • Maximum input signal power : 0dBm
  • Dynamic Range : 60dB
  • No damage input power : CW = 1W, Pulse = 20 peak
  • Antena Type : Spiral Arsimedes
  • Gain : 1-8 dBi
  • 3dB bandwidth : 115 degree - 60 degree
  • Polarization : RHCP
  • Axial Ratio : 3 dB max
  • VSWR : 1 = 2.5 max