How can tomographic image resolution be obtained using wifi sensing and imaging?

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Discussion Overview

The discussion centers on obtaining tomographic image resolutions using WiFi sensing and imaging through signal processing techniques. Participants explore the relationship between antenna configurations and image resolution, as well as the challenges posed by different frequency bands.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about methods to achieve tomographic image resolutions using WiFi sensing and imaging.
  • Another participant suggests that the resolution is influenced by the spacing of antennas in an array, providing a formula for angular resolution based on the wavelength.
  • A different participant mentions the importance of having multiple antenna elements spaced appropriately to resolve lower spatial frequencies in the image.
  • One participant notes that the wavelength at 2.4 GHz is 12 cm and highlights the challenges of achieving resolution below this frequency, while stating that 5 GHz offers improved resolution.

Areas of Agreement / Disagreement

Participants present various viewpoints on the factors affecting tomographic image resolution, indicating that multiple competing views remain without a consensus on the best approach or method.

Contextual Notes

Some limitations are noted regarding the dependence on antenna spacing and frequency, as well as the unresolved challenges in achieving higher resolutions at lower frequencies.

tomography
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TL;DR
tomographic image resolutions from wifi sensing
hello i would like to ask how to obtain tomographic image resolutions from wifi sensing and imaging using signals processing. thanks very much.
 
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Welcome to PF.

If you have one wifi transmitter and multiple receiver antennas, then the image resolution will be a function of the spacing of the furthest apart antennas. Where λ is the aperture of the antenna array in wavelengths. The angular resolution in degrees will be approximately;
Resolution = 57° / λ;
That can be applied in the horizontal and vertical dimensions.
The antenna array will need several elements, variously spaced between the end elements, to resolve the lower spatial frequencies in the image.
 
2.4 GHz is 12 cm. Seeing below that poses a fundamental challenge. 5 GHz is twice as good.
 

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