Biometric authentication using wideband UHF/VHF radar

1. A wideband RADAR system for biometric identification and authentication of a human subject, the system comprising:

a source of wideband RADAR signals;

an amplifier;

a splitter in electrical communication with the source of wideband RADAR signals and configured to split a generated signal into a transmit signal and a reference transmit signal;

a transmitting antenna configured to transmit the transmit signal from the splitter;

a turntable configured to rotate the human subject;

a receiving antenna configured to receive transmitted signals reflected from the human subject; and

a controller configured to process the received reflected signals and generate a resolution cell and polar representations of biometric radar signature features.

2. The wideband RADAR system of claim 1 , further comprising:

a vector network analyzer,

wherein the vector network analyzer is connected between the receiving antenna and the controller.

3. The wideband RADAR system of claim 1 , wherein the receiving antenna is a TEM receiving antenna.

4. The wideband RADAR system of claim 1 , wherein the transmitting antenna is a IRA-3Q transmitting antenna.

5. The wideband RADAR system of claim 1 , wherein the controller is further configured to:

pre-process received reflected signals by:

removing noise from the reflected signals;

removing background from the reflected signals; and

removing an antenna response from the reflected signals.

6. The wideband RADAR system of claim 5 , wherein the controller is further configured to:

condition the pre-processed reflected signals.

7. The wideband RADAR system of claim 6 , where the pre-processed reflected signals are conditioned by:

performing first and second numerical derivative tests;

determining peak locations with an average value filter; and

determining a peak measurement vector.

8. The wideband RADAR system of claim 1 , wherein the controller is further configured to:

compare the polar representations of biometric radar signature features to a known human subject.

9. The wideband RADAR system of claim 1 , wherein the source of wideband RADAR signals comprises an Arbitrary Waveform Generator.

10. The wideband RADAR system of claim 1 , wherein the turntable is configured to rotate through a set number of equi-spaced degree measurements.

11. The wideband RADAR system of claim 10 , wherein the turntable is configured to rotate through 121 equi-spaced degree measurements.

12. A method of biometric identification and authentication of a human subject from wideband RADAR, the method comprising:

receiving I/Q wideband RADAR data for a subject for at least 121 views;

preprocessing the received data by:

centering the received data;

removing noise from the received data using a modified Gabor filter; and

removing background from the received data;

forming a data cube by processing the preprocessed received data by:

performing first and second numerical derivative tests;

determining peak locations; and

determining a peak measurement vector;

determining biometric radar signatures by bio-coding the data cube using features determined to be unique via anthropometric and dosimetry studies;

generating a template polar plot biometric radar signature;

retrieving a saved subject template; and

comparing the template polar plot biometric radar signature to the saved subject template.