| 摘要 |
The apparatus of the present invention consists of a MicroPower Radar (MPR), a data acquisition (DAQ) element and a PDA. The radar sends a short, low-amplitude signal of radio-frequency (RF) energy toward the target scene. This signal reflects from the target and is received as a Doppler change. RF has the advantages of penetrating clothing while operating at one fiftieth the power of a cellular or cordless phone. This Doppler change in signal amplitude is filtered, amplified and presented to the DAQ. The DAQ converts the analog Doppler signal into a digital bit-stream and passed to the processor. Proprietary software analysis is performed to further filter and to make a Live/Dead determination. The radar antenna is located at the back of the device and should be pointed toward the victim, the display facing the operator.
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