ELECTRONIC WARFARE SOUTH AFRICA 2017International Conference & Exhibition6-8 November 2017 | CSIR, Pretoria

ELECTRONIC WARFARE SOUTH AFRICA 2017International Conference & Exhibition6-8 November 2017 | CSIR, Pretoria

Jammer signal effectiveness

against the conical-scan

missile seeker

TSHOLOFELO MALATJI

Prof W. du Plessis

Background

• 90% of damaged aircraft due to IR missiles

• IR missiles are highly proliferated

• Great need for reliable countermeasures

• Deception jamming is much cheaper than other approaches

Literature

• T. W. Bae et al. [1] considered the J/S ratio and the frequency

• M. C. Sahingil et al. [2] considered the duty ratio

• A number of simulations [1], [3] – [5] only consider a pulse train jammer

• Comparison of jammer waveforms not provided

• Effects of AGC time constant not thoroughly considered

• Great need for understanding what makes jammer effective

4

Operation principle

5

Operation principle

Nutation

7

OPERATION PRINCIPLE

8

PROCESSING OF DETECTOR SIGNAL

RESULTS – Pulse train jammer

RESULTS – Pulse train jammer

RESULTS – FM jammer

RESULTS – FM jammer

RESULTS – AM jammer

RESULTS – AM jammer

Conclusion

• Jammer effect is dependent on the signal processing of the studied seeker

• The higher the J/S ratio, the greater the effect

• The effective frequency is dependent on the jammer waveform

• The AGC time constant significantly affects the effectiveness of the jammer signal

• More jammer waveforms have to be considered

THANK YOU!

Tmalatji@csir.co.za

REFERENCES

• [1] T. W. Bae, B. I. Kim, Y. C. Kim, S. H. Ahn, "Jamming effect analysis of infrared reticle seeker for directed infrared countermeasures," Infrared Physics & Technology, vol. 55, no. 5, pp. 431 – 441, Sep. 2012.

• [2] M. C. Sahingil, M. S. Aslan, “The effectiveness of the jammer signal characteristics on Conical-Scan systems,” in Proc. SPIE 9478 Conf. on Modelling and Simulation for Defence Systems and Applications X, Baltimore, Maryland, 20 – 24 Apr. 2015, pp. 86 - 101.

• [3] F. Qian, J. Guo, J. Shao, T. Wang, “Study of jamming of the frequency modulation infrared seekers,” SPIE Proc. of the 5th Int. Symp. Photoelectronicdetection and imaging; Infrared imaging and applications, Beijing, China, 23 – 25 Jun. 2013, pp. 28 – 36.

• [4] G. Y. Kim, et al., "Implementation of a Reticle Seeker Missile Simulator for Jamming Effect Analysis," in Proc. of the 2nd Int. Conf. on Image Processing Theory Tools and Applications (IPTA), Paris, France, 7 – 10 Jul.2010, pp. 539 – 542.

• [5] C. J. Tranchita, K. Jakstas, R. G. Pallazo, "Countermeasure systems," in The Infrared & Electro-Optical Systems Handbook, vol. 7, Raleigh, NC: SciTech publishing Inc, 2006, ch. 3, pp. 235 – 285.