Embedded Systems
Embedded systems
(Life detecting circuit using PIC microwave controller)
ABSTRACT: A new revolutionary microwave life detection system. Which is used to locate human beings buried (or) trapped under earthquake rubble has been designed. This system operating at certain frequency can remotely detect the breathing and heart beat signals of human beings buried under earthquake rubble. By proper processing of these signals, the status of the person under trap can be easily judged. The entire process takes place within a few seconds as the system is controlled by a PIC Microcontroller unit.
1. Introduction
At present as we know the need of an hour is to find an effective method for rescuing people buried under the earthquake rubble or collapsed building. It has to be done before we experience another quake. Present methods for searching and rescuing victims buried or trapped under earthquake rubble are not effective. Taking all these factors in mind, a system which will be really effective to solve problem has been designed. 2. 2. Principle of operation The basic principle is that when a microwave beam of certain frequency [L or S band of UHF band] is aimed at a portion of rubble or collapsed building under which a person has been trapped, the microwave beam can penetrate through the rubble to reach the person. When the person is focused by the microwave beam, the reflected wave from the person’s body will be modulated or changed by his/her movements, which include breathing and heart beat. Simultaneously, reflected waves are also received from the collapsed structures. So, if these reflected waves from the immovable debris are cancelled and the reflected wave from the person’s body is properly distinguished, the breathing and heart beat signals can be detected. By proper processing of these signals, the status of the person under
(Life detecting circuit using PIC microwave controller)
ABSTRACT: A new revolutionary microwave life detection system. Which is used to locate human beings buried (or) trapped under earthquake rubble has been designed. This system operating at certain frequency can remotely detect the breathing and heart beat signals of human beings buried under earthquake rubble. By proper processing of these signals, the status of the person under trap can be easily judged. The entire process takes place within a few seconds as the system is controlled by a PIC Microcontroller unit.
1. Introduction
At present as we know the need of an hour is to find an effective method for rescuing people buried under the earthquake rubble or collapsed building. It has to be done before we experience another quake. Present methods for searching and rescuing victims buried or trapped under earthquake rubble are not effective. Taking all these factors in mind, a system which will be really effective to solve problem has been designed. 2. 2. Principle of operation The basic principle is that when a microwave beam of certain frequency [L or S band of UHF band] is aimed at a portion of rubble or collapsed building under which a person has been trapped, the microwave beam can penetrate through the rubble to reach the person. When the person is focused by the microwave beam, the reflected wave from the person’s body will be modulated or changed by his/her movements, which include breathing and heart beat. Simultaneously, reflected waves are also received from the collapsed structures. So, if these reflected waves from the immovable debris are cancelled and the reflected wave from the person’s body is properly distinguished, the breathing and heart beat signals can be detected. By proper processing of these signals, the status of the person under
References: 1. “Microwaves” by K.C.Gupta 2. IEEE transactions on “Instrumentation and measurement” & “Biomedical Engineering” 3. PIC Microcontroller- Microchip’s reference manual. 4. “Automatic clutter” – canceller for microwave life detection system” 5. “Microwave devices and circuits” by Samuel. Y.Liao.