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1. WIRELESS
VISION
Designed By : Nirmal Ram
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3. Key Idea
Wi-Vi
Device

4. challenges
RF signals penetrate walls:
Reflect off objects on other side of wall
Distinguish reflectors by their arrival times
At low bandwidth:
Wall reflection much stronger than
reflections coming from behind the wall.
Flash effect: wall reflection saturates the
ADC
Previous attempts to track moving targets
through
walls have done so using an array of
spaced antennas. This would be too
expensive and bulky.
FlashEffect
TraditionalSystem
Identifyingand
trackingHumans

5. Any
Solutions ?

6. How to Eliminate
Wall’s Reflection
Step 1
Initial Nulling
Step 2
Power Boosting
Step 3
Iterative Nulling

7. Algorithm
for
Nulling
h2
h1
px
X
y = h1‘ x + h2‘px
p = -h1’ / h2‘

8. How to Track
Human
movement
I S A R
Inverse Synthetic Aperture Radar

9. How to Track
Human
movement
Direction of motion
At any point in time, we
have a single measurement

10. How to Track
Human
movement
Direction of motion
θ
Direction
of motion

11. Advantages

15. bandwidth

17. Limitations

18. Low resolution

19. Thicker walls more than 8“ wont be helpful

20. Applications

21. Law enforcement

22. Emergency situations

23. Smart sensing

24. Personal security

25. Intruder Detection

26. Gamings

28. THE
END
Written &Designed by
Nirmal Ram
Publications
My-Work™
Thanks
To All my friends
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