Transcript PRI Prediction Enhances EW Training

MC Countermeasure Inc.
PRI Prediction
Enhances EW Training
By
Scott McDonald & Ken McRitchie
Ottawa, Ontario, Canada
Visit us at http://www.mc-cm.com
Overview
• Training vs
Operational ECM
• Need for Prediction
• PRED Features
• PRED Performance
• Summary
19-Feb-2002
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DRFM
• DRFM-based ECM originally
developed for fully coherent
applications
• Constant PRI makes up-range
false targets easy
• Would like to do same with
non-coherent/coherent on
receive radars
19-Feb-2002
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Training Application
• RAN/CF Programs
• DRFM-based ECM
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Operational vs Training
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Mil-spec
Protect platform
Configuration control
Optimized by threat
Highly integrated,
compact size
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Benign environment
Non-interference
Highly programmable
Generate a variety of
ECM effects
• Must replicate current
and future generation
ECM
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Constant PRI
PRI 1
FT
False Target Delay
PRI 2
R1
FT
R1
PRI 3
FT
R1
PRI 4
FT
R1
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Staggered PRI
PRI 1
FT
False Target Delay
PRI 2
R1
FT
R2
PRI 3
FT
R3
PRI 4
FT
R4
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Radar Characteristics
• Surveillance, search, acquisition, TTR, TI
• Constant, dwell shift, modulated or
staggered PRI patterns
– Multi-element/position
– Sliding
– Sinusoidal
• 2 us < PRI < 14 ms
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Isolation
• Many antennas compete for
little space in most EW
Training installations
– Leads to insufficient isolation
to transmit and receive
simultaneously
– Precludes cover pulse
– Situation corrected with PRI
prediction
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Features
• Fast “learning”
– No UDF
• Prediction < 250 ns
• > 128 positions
• Adaptive
Acquisition
• Fade mode
• TG Enhancements
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Block Diagram
Clock
Optional PW
Measurement
PRI
Measurement
Detected
Video
Optional RF
Tag
Prediction Algorithm (CPU)
JTAG Algorithm
Upload Port
20-Bit
Predicted
PRI Value
Predicted PRI
Output
Up Range False Target Generator
(for demonstration purposes)
In-Bound False
Target Strobes
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Integration with TG
False Target
Strobes
TG
Detected Video and RF Tag
From RF Sub-System
20-Bit Predicted PRI
DIO
JTAG Port
PRI Predictor
DRFM
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Optional FT Generator
RBM
Generator
PW Meas.
Up Range
False
Target
Strobes
PRI Predictor
JTAG Port
FT Gen
Detected Video and RF Tag
From RF Sub-System
20-Bit False
Target
Range Word(s)
DIO
Techniques Generator
Down Range
False Target
Strobes
DRFM
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Performance 1
Performance Comparison
Percent Correct Predictions
100%
90%
Adaptive
Non-Adaptive
80%
70%
60%
50%
40%
30%
20%
10%
0%
0
10
20
30
40
50
60
70
80
90
100
No. of PRIs per Burst
(5 Element/25 Position Stagger Pattern)
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Performance 2
Known Radar Parameters
Specification
Measured 15/8/01
Stagger Pattern Length
1000
100
10
1
1
10
100
1000
10000
Minimum PRI (us)
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Summary
• PRI prediction is necessary to effectively use a
DRFM-based system in a modern EW training
application
– Prediction circuitry is not standard
• MC Countermeasures has developed a line of
predictors that can be easily interfaced to existing
training systems
– Integrated with existing TG
– Provide additional TG capability
– Work around insufficient antenna isolation
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Acknowledgements
• The authors would like to acknowledge the
contributions of Dan Grise and Remi Gauvin
who did much of the hardware and software
implementation.
• For Further information please feel free to
contact us at: MC Countermeasures Inc.
39 Robertson Road – Suite 256
Nepean, Ontario, K2H 8R2, Canada
Tel: +1(613) 721-1552
Fax: +1 (613) 721-1553
e-mail: [email protected]
19-Feb-2002
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