achieving real time pulse to pulse pri prediction
Download
Skip this Video
Download Presentation
Achieving Real-time Pulse-to-pulse PRI Prediction

Loading in 2 Seconds...

play fullscreen
1 / 28

Achieving Real-Time Pulse to Pulse PRI Prediction - PowerPoint PPT Presentation


  • 1003 Views
  • Uploaded on

Achieving Real-time Pulse-to-pulse PRI Prediction. By Rémi Gauvin B.A.Sc. Computer Engineering MC Countermeasures Inc. Objectives. Radars and Current ECM Overview What is PRI Prediction and its Benefits? How PRI Prediction is Achieved Results Obtained Conclusion and Future Look.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Achieving Real-Time Pulse to Pulse PRI Prediction' - ivanbritt


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
achieving real time pulse to pulse pri prediction

Achieving Real-time Pulse-to-pulse PRI Prediction

By Rémi Gauvin

B.A.Sc. Computer Engineering

MC Countermeasures Inc.

objectives
Objectives
  • Radars and Current ECM Overview
  • What is PRI Prediction and its Benefits?
  • How PRI Prediction is Achieved
  • Results Obtained
  • Conclusion and Future Look

Visit us at http://www.mc-cm.com

introduction on radars
Introduction on Radars
  • Pulsed Doppler Illuminator
    • Constant PRI
  • High PRI Pulsed Doppler
    • Constant PRI and Dwell-Shift
  • Medium PRF Pulsed Doppler
    • Staggered PRI (few stagger levels)
  • Low PRI Pulsed Doppler
    • Staggered PRI
  • Low PRF Radars
    • Complex PRI Patterns

Visit us at http://www.mc-cm.com

pri pattern modulations
PRI Pattern Modulations

Visit us at http://www.mc-cm.com

current ecm noise jamming
Current ECM: Noise Jamming
  • Noise masks out the target return
  • Good against older non-coherent radars with wide instantaneous bandwidth
  • Unsuccessful against:
    • Burst-to-burst RF agile radars
    • Coherent processing Radars with narrow bandwidth Doppler filtering
  • Noise jamming with fast tuning oscillator may be ineffective due to low tuning accuracy

Visit us at http://www.mc-cm.com

current ecm deception using analog delay lines
Current ECM: Deception Using Analog Delay Lines
  • Analog delay lines holds the Radar pulse to create a delayed copy
  • Down range false targets only
  • RGPO: Range Gate Pull Out technique
    • Radar’s MTI Filter follows the false target instead of the target return.
  • Noise accumulates quickly in the delay line making the technique limited to only a few s

Visit us at http://www.mc-cm.com

current ecm deception using drfm s
Current ECM: DeceptionUsing DRFM’s
  • Digital Radar Frequency Memory (DRFM)
  • Store the Radar pulse indefinitely
  • False Target Position can be anywhere for constant PRI modulation
  • Range Gate Pull Out and Range Gate Pull In Technique are possible
  • Problem: Non Constant PRI Modulation Limits the False Target Position to Down Range

Visit us at http://www.mc-cm.com

solution pri prediction
Solution: PRI Prediction
  • Pulse Repetition Interval (PRI) Prediction consists of estimating the time of arrival (TOA) of the next Radar pulse
  • Paired with a DRFM based system a PRI Predictor can produce targets over the full PRI range

Visit us at http://www.mc-cm.com

constant pri
Constant PRI

False Target can be positioned anywhere with or without prediction

Visit us at http://www.mc-cm.com

non constant pri without prediction
Non Constant PRIwithout Prediction

Without prediction the false target position is limited to down range for non-constant pattern modulation

Visit us at http://www.mc-cm.com

non constant pri with prediction
Non Constant PRIwith Prediction

With prediction the false target can now be positioned correctly anywhere regardless of pattern modulation

Visit us at http://www.mc-cm.com

other advantages of pri prediction fades
Other Advantages of PRI Prediction : Fades
  • Production of false targets during signal fades or receiver blanking
  • Even though the video signal is blanked the false targets are still produced in their correct position

Visit us at http://www.mc-cm.com

other advantages of pri prediction filtering
Other Advantages of PRI Prediction: Filtering
  • Knowing when the next pulse should occur allows the system to write only valid pulses in the DRFM and trigger false targets only on valid pulses
  • Improved filtering of multiple signals with the use of time gating principles

Visit us at http://www.mc-cm.com

difficulties in pri prediction
Difficulties in PRI Prediction
  • Data rate (PRI’s range for 2 s to 15 ms)
  • Corrupt data
    • PRI pattern containing extra pulses
    • PRI pattern missing pulses
  • Interleaved patterns
    • Multiple radars in band
    • Noise in band

Visit us at http://www.mc-cm.com

to make pri prediction work
To Make PRI Prediction Work
  • A System must:
    • Track various modulation type such as: Constants, Dwell-Shifts, Staggered, Linear-Sliding and Wobulated (Sinusoidal)
    • Base prediction on real-time data
    • Perform real-time pulse-to-pulse analysis and prediction
    • Have minimal sensitivity to spurious and missing pulses
    • Have the ability to keep track through signal fades

Visit us at http://www.mc-cm.com

multiple thread solution
Multiple Thread Solution
  • MC-CM Adaptive Prediction Scheme
    • The system has a Multiple Instruction Single Data (MISD) Structure and runs a variety of predictive algorithms on different threads
    • The algorithms learns the pattern and issues predictions in real-time on pulse-to-pulse basis

Visit us at http://www.mc-cm.com

typical prediction process
Typical Prediction Process
  • Predictions for upcoming PRI’s originate from associating individual weights to different PRI’s accumulated over the last while

Visit us at http://www.mc-cm.com

multiple thread solution 2
Multiple Thread Solution (2)

Visit us at http://www.mc-cm.com

pri prediction system
PRI Prediction System

Visit us at http://www.mc-cm.com

available form factors
4 x 4 inches

USB Interface

3 x 3 inches

Serial Interface

Available Form Factors

Visit us at http://www.mc-cm.com

performance vs constants dwell shifts and sliding
Performance vs. Constants, Dwell-Shifts and Sliding
  • Accurately tracks the PRI after a few pulses
  • PRI can range from 2s to 15 ms

Visit us at http://www.mc-cm.com

performance vs staggered
Performance vs. Staggered

Visit us at http://www.mc-cm.com

performance vs wobulated
Performance vs. Wobulated
  • Tracks after 100 to 150 PRI’s (Typically)
  • Min PRI of 75 us, Max Deviation +/- 50 %
  • As little as 4 PRI per cycle required

Visit us at http://www.mc-cm.com

random pulse drop outs
Random Pulse Drop Outs

Visit us at http://www.mc-cm.com

conclusion
Conclusion
  • PRI Prediction improves ECM Effectiveness
    • False target production is possible over full range of the PRI regardless of the PRI pattern modulation
    • Can produce false targets during signal fades and receiver blanking.
    • Sorts unwanted information from DRFM with time gating principles

Visit us at http://www.mc-cm.com

future
Future
  • What is next:
    • Pulse de-interleaving using RF data to isolate a single emitter out of many
    • Tracking and jamming multiple emitters simultaneously or in a time shared fashion
    • Improved tracking and acquisition of various modulation types in a corrupt environment

Visit us at http://www.mc-cm.com

acknowledgements
Acknowledgements

Special thanks to :

  • Scott McDonald
  • Ken McRitchie
  • Dan Grise

For information, resources and work performed

on the PRI Predictor line of systems

Visit us at http://www.mc-cm.com

questions
? Questions ?

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

http://www.mc-cm.com

[email protected]

THANK YOU FOR YOUR ATTENTION

Visit us at http://www.mc-cm.com

ad