Missing Human Detector Using Short-Range RF Signal

Sulaiman , Musa (2006) Missing Human Detector Using Short-Range RF Signal. Project Report. Melaka, Malaysia, UTeM. (Submitted)

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Abstract

Sometimes people are missing in a forest or other places and are very difficult or time-consuming to find them out. In this project, a short-range transmitter and receiver \ViII be demonstrated to find the missing people in shorter time. People usually search missing human in the forest by using helicopter and track them from the air or by tracking with dog. Sometimes they might take longer time to track the missing person because they didn't have any clue or hint where the missing person located. But with this device, we will find that it is much easier to track them by knowing where is the direction of the person is at that time from the tracker location. Logically we will find that it is smarter and faster to track the missing person compare with traditional way. To track the missing person, they must first wear a device called transmitter where the transmitter will transmit a short-range signal at a frequency of 315MHz at all time to the receiver and the receiver will detect them if the receiver was turned on. The receiver also uses the frequency of 3l5MHz. To track the direction of the signal from the transmitter, the field strength meter were used to estimate the range of each signals received. Based on the project result, we can se that the higher the current measured the shorter distance transmitter from the receiver. The direction of transmitter was identified by comparing beTWeen multi directions of the signals measured. The highest value of the current measured from the Field Strength Meter circuit will be chosen as the direction of the transmission signals by using the principles of the directional antenna that will further discuss in this thesis.

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