Sensor: Electromagnetic

Description

The electromagnetic sensor is designed to be a basic sensor that has the ability to sense an attached electromagnetic signature to a physical component. The sensor was designed as a testing methodology for the EM signatures attached to physical components and therefore functions with major limitations and assumptions.

Example Use Cases

EM Signature Verification: This scenario visually verifies the electromagnetic signature attached to a physical component.

Module Implementation

The module of the sensor is to detect the gain achieved at the position of the sensor with respect to that of the component.

Initially the direction vector between the component and the sensor is calculated as follows,

\[ \begin {equation} \mathrm{direction}=|S_p-C_p|\end{equation} \]

where \(S_p\) and \(C_p\) is the position vector of the Sensor and the Component respectively.

The angle between the direction vector and the pointing vector is then calculated as follows,

\[ \begin{equation}\theta=\cos^{-1}(\mathrm{direction}\cdot \vec{S_z})\end{equation} \]

where,

\(\theta:\) Angle of sensor

\(\vec{S_Z}:\) Up vector of the sensor

The gain of the sensor is determined using a preconfigured look up table of the subject component.

The gain is then adjusted to account for the space loss as follows

\[ \begin{equation}L_{space}=20\log{C}-20\log{\pi}-20\log{S}-20\log{f}\end{equation} \]

where

\(L_{space}\): Space Loss

\(C\): Speed of light

\(S\): Distance

\(f\): frequency of electromagnetic signature

The space loss is added to the sensed gain to obtain the final electromagnetic gain

Assumptions/Limitations

The accuracy of the sensed gain is highly dependent on the look up table initialized
Electromagnetic frequency is essential for the functionality of the module
The sensor assumes no other electromagnetic gains or losses other than the subjects signature and space loss

References