Co-operative wireless based imaging of an unknown area

Project is based on imaging with the help of wifi rssi values, We have wifi signals easily available everywhere Now a days, the capability of wifi signals to penetrate through the walls , we use this wifi for the wall imaging of the object behind the walls, by using antennas and different correlatio

Project Title

Co-operative wireless based imaging of an unknown area

Project Area of Specialization

Internet of Things

Project Summary

Project is based on imaging with the help of wifi rssi values, We have wifi signals easily available everywhere Now a days, the capability of wifi signals to penetrate through the walls , we use this wifi for the wall imaging of the object behind the walls, by using antennas and different correlation techniques.

"Who is behind the wall?" it is very difficult to see , but using the wifi signals we are able to see inside the room as well as we can also map the whole room.

In addition , We can also detect the object inside the room either Human, plastic and metal object etc, as well as their dimensions or its distance from the wall. 

Wifi is also used for the holograms but our project isn't about the holography but the 2-d imaging of the object in advance we can also use wifi signals for 3-D imaging of the object.

This project is based on the hardware and software as well. so by using antennas we can scan the area from all the dimension Left to right and top to bottom , When the signal travel in free space so there is not any effect on the RSSI values , when there is an object in the path of the signal the strength of the signals decreases, the ratio of decreasing the rssi values for the multiple of object is different.

After scanning the area among x,y and z dimensions we use the wifi rssi values to calculate the area , so this help us for the imaging of the object.

The project is very beneficial for the various applications in our daily life such as ,

For Example :- For the positioning of the object, Search and rescue, Archeological sites and also for military use.

Project Objectives

We divide Our whole project into four different objectives.

Objective 1 : Literature Review  :

In literature review we read different research papers about this project that how the researchers used the wifi signals for the imaging of the object , and we found for the first time this idea was implemented in 2017,

we read out multiple of research papers but use this two for the guidlines of our project :

Reference 1 = "3DThrough-WallImaging with Unmanned Aerial Vehicles Using Wi-Fi  (Professor Mostofi of California Santa Barbara SantaBarbara,California93106)"

Reference 2 = ?Holography of Wi-Fi radiation(TechnischeUniversität München, Walter Schottky Institut and Physik Department,Am  Coulombwall  4,85748 Garching,Germany)  Author (Philipp M.Holl (corr.author), Friedemann Reinhar. 

Objective 2 Obtaining the RSSI Values :

Our second objective is to obtain the rssi values from the different positions and angles ,We also placed multiple objects , e.g human, wood , metal etc.

we scan the object from x,y,z dimensions in order to analyze the variation in the RSSI signals of the different objects.

Objective 3 Mapping the Area :

Our third objective is to mapping the area where the object is placed , so for the mapping of object we set up min and max threshold of the RSSI values so form this we can apply 1's and 0's techniques for the binary image.

Objective 4 Imaging Of the Object :

Our Last Objective is the 2-d imaging of the object in software by using different coding techniques and algorithm. 

Project Implementation Method

We can implement our project as our objectives completed , our step by step procedures are as under,

Step # 1 :-

Our first step is to obtain rssi values by using two different antennas , one is the scanning antenna and the other is the reference antenna.

In this process first antenna is fixed (Reference antenna) and we move scanning antenna from all the three dimensions in order to obtain RSSI values.

Step # 2 :-

Obtaining the RSSI values is not easy we need to set an Threshold value, from all three dimensions and from different angles .

We required two things RSSI power and the Area . From these two steps we got the RSSI power.

Step # 3 :-

The key role of the reference antenna is to correlate the RSSI values in order to analyze the difference.

The above process we did by using the Omnidirectional antenna , as we know the Beam width of the omni directional antenna is to broad so it is difficult for us to detect the smaller object with in the path of the signals so therefore we use directional antenna in order to direct the beam towards the object.

Step # 4

From the above three steps we got the clear image that RSSI value varries from one place to another place as the antennas moving from one point to another ,so with the help of this we can calculate the area and the RSSI power.

Step # 5 :- 

In this step we form the binary image of the object detecting ,using the different algorithims likewise "dark field propagation methode 

we use different softwares for the imaging like arcylic wifi heat , Matlabs and much more according to our requirements.

Benefits of the Project

?Search and Rescue : For Search and rescue after any disaster such as Earthquake and Tsunami.

?Positioning of Vehicle : For Positioning of vehicle behind the wall.

?Archeological Sites : a non-invasive approach to see details through blocking objects, without a need to dig.

?For Robotic Nerworks : These nodes need to constantly build an understanding of their environment (e.g., obstacle mapping) for path planning and navigation.

Technical Details of Final Deliverable

1) Directional Antenna 16 dbi gain yagi antenna;

  23 degree vertical beamwidth , 26 degree horizontal beamwidth.

The Antenna is used for the scanning .

Reference Antenna :-

INTELLINET  NETWORK  SOLUTIONS, Indoor Omni-Directional Antenna, 2.4 GHz, 5 dBi,    Part number 502290    

2) Wifi Router D-Link WBR 1310

3) TP LINK TL -WN722 N

4) Raspberry pi 2 model B

5) Amplifier Mini-circuit  ZX60-43-S+

6) Mixer Mini-circuits ZX05-C42-S+

7) Splitter Mini-circuits   ZX10-2-442-S+

8) Band Pass Filter Mini-circuits VBF-2435+

9) HF Oscillator Mini-circuits ZX95-2500A-S+

Final Deliverable of the Project

HW/SW integrated system

Type of Industry

IT , Medical , Others , Security , Telecommunication

Technologies

Artificial Intelligence(AI), Internet of Things (IoT)

Sustainable Development Goals

Decent Work and Economic Growth, Industry, Innovation and Infrastructure

Required Resources

If you need this project, please contact me on contact@adikhanofficial.com