The output of the mixer consists Initially the switch is kept in of the breathing and heart beat position1 i.e Signal is transmitted signals of the human plus some through the antenna1 unavoidable noise. Wait for some predetermined This output is fed through a low sending time ,Ts frequency amplifier and a band Then the switch is thrown to position2 i.e Signal is received pass filter (0.4 HZ) before through the antenna2 displayed on the monitor . Wait for some predetermined receiving time Tr The function of the digitally Go to step 1 controlled phase of the local Repeat the above procedure for some predetermined time, T. reference signal for the purpose of increasing the system sensitivity. The reflected signal from the CLUTTER CANCELLATION body after amplification SYSTEM: person’s by the pre-amplifier is mixed with Send the signal to the rubble the local reference signal in a through antenna1. double balanced mixer. Receive the signal from the rubble through antenna2. MICROPROCESSOR CONTROL Check the detector output .if it UNIT: is within the predetermined The algorithm and limits go to step5. flowcharts for the antenna system and Otherwise send the correction the clutter cancellation system are as signal to the digitally follows : controlled phase shifter1 and ANTENNA SYSTEM: the attenuator and go to step1.
The output of the mixer consists of the breathing and heart beat signals of the human plus some unavoidable noise. This output is fed through a low frequency amplifier and a band pass filter (0.4 HZ) before displayed on the monitor . The function of the digitally controlled phase of the local reference signal for the purpose of increasing the system sensitivity. The reflected signal from the person’s body after amplification by the pre-amplifier is mixed with the local reference signal in a double balanced mixer. MICROPROCESSOR CONTROL UNIT: The algorithm and flowcharts for the antenna system and the clutter cancellation system are as follows : ANTENNA SYSTEM: Initially the switch is kept in position1 i.e Signal is transmitted through the antenna1 Wait for some predetermined sending time ,Ts Then the switch is thrown to position2 i.e Signal is received through the antenna2 Wait for some predetermined receiving time Tr Go to step 1 Repeat the above procedure for some predetermined time, T. CLUTTER CANCELLATION SYSTEM: Send the signal to the rubble through antenna1. Receive the signal from the rubble through antenna2. Check the detector output .if it is within the predetermined limits go to step5. Otherwise send the correction signal to the digitally controlled phase shifter1 and the attenuator and go to step1.
217172596-Embedded-System-life-Saving-Us.docx