Electronic Protection Measures (ECM) Flashcards

1
Q

What does ECM do for radars?

A

Maintenance of target tracks
Discrimination of the directional interference
Rejection of false targets
Counteraction of ECM
Radar system survivability

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2
Q

What threats does EPM face?

A

Jamming
Chaff
Clutter
CW interference

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3
Q

4 areas of EPM design (ie where do you incorporate EPM design)

A

Transmitter
Antenna
Receiver
Signal Processing

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4
Q

Transmitter EP

A

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.

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5
Q

Antenna EPM: Sidelobe blanking

A

Threshold comparison to remove sidelobe returns.

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6
Q

Antenna EPM: Sidelobe Cancellation

A
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7
Q

Antennta EPM: Polarization Purity

A

Only accepting signals int he polarization expected

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8
Q

Receiver EPM: Saturation Prevention

A

IAGC
STC
Lin/Log receiver

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9
Q

What are methods of Receiver EPM?

A

Saturation prevention (IAGC)
Fast Time Constant
Clutter Suppression (MTI, MTD)
PRF Correlation

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10
Q

2 methods of Antenna EPM:

A

Sidelobe Blanking
Coherent Sidelobe Cancellation (CSLC)
Polarization Purity
Conical Scan - Receive Only (COSRO)

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11
Q

Receiver EPM: PRF Correlation

A

Guard gates are set up to prevent range gate pull-off

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12
Q

What 6 things are would improve a transmitter EP performance?

A

Frequency agility
Frequency diveristy
Waveform coding
Pulse Length
PRF stagger/jitter
High average power

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