Electronic Protection Measures (ECM) Flashcards
What does ECM do for radars?
Maintenance of target tracks
Discrimination of the directional interference
Rejection of false targets
Counteraction of ECM
Radar system survivability
What threats does EPM face?
Jamming
Chaff
Clutter
CW interference
4 areas of EPM design (ie where do you incorporate EPM design)
Transmitter
Antenna
Receiver
Signal Processing
Transmitter EP
Frequency must be agile accross a wide range of frequencies
Encode its waveform to distinguish it.
Stagger the PRF to be difficult to predict
Increase its average power above what a jammer could make.
Antenna EPM: Sidelobe blanking
Threshold comparison to remove sidelobe returns.
Antenna EPM: Sidelobe Cancellation
Antennta EPM: Polarization Purity
Only accepting signals int he polarization expected
Receiver EPM: Saturation Prevention
IAGC
STC
Lin/Log receiver
What are methods of Receiver EPM?
Saturation prevention (IAGC)
Fast Time Constant
Clutter Suppression (MTI, MTD)
PRF Correlation
2 methods of Antenna EPM:
Sidelobe Blanking
Coherent Sidelobe Cancellation (CSLC)
Polarization Purity
Conical Scan - Receive Only (COSRO)
Receiver EPM: PRF Correlation
Guard gates are set up to prevent range gate pull-off
What 6 things are would improve a transmitter EP performance?
Frequency agility
Frequency diveristy
Waveform coding
Pulse Length
PRF stagger/jitter
High average power
