Systems and methods for handheld single chip submillimeter radars
An apparatus comprises a coherent radar system on a single chip configured to transmit high-frequency signals with a center frequency in a submillimeter wavelength range that corresponds to a frequency range of 0.3 THz and no greater than 0.4 THz. The radar system on the single chip (RSOC) comprises a phased array transmitter antenna configured to emit a radar beam with a center frequency of greater than 0.3 THz and no greater than 0.4 THz. The RSOC further includes a receiver configured to provide a voltage signal to a wide band receiver voltage controlled oscillator to form a phased array receiver antenna configured to receive reflected signals from the emitted radar beam.
1. A method, comprising:
scanning a subject with a coherent submillimeter radar beam from a single chip radar system operating in a corresponding frequency range of between 0.1 THz and 1 THz the radar system comprising a transmitter that includes:
a ramp generator electrically coupled to, and configured to provide a voltage signal to, a wide band voltage controlled oscillator;
a directional coupler electrically coupled to the wide band voltage controlled oscillator, and
a phased array antenna electrically coupled to the directional coupler and configured to transmit high-frequency signals in the range of operation;
the method further comprising:
executing instructions, on a processor, to create a plurality digital images based on said scanning;
combining, at the processor, the digital images to form a super image;
determining, at the processor and based on the super image, whether the subject is carrying a concealed object;
when the subject is determined to be carrying a concealed object, determining, at the processor, whether the object meets certain rules for generating an alert; generating the alert.
2. The method of claim 1 , wherein the alert is at least one of an audible alert or a visual alert.
3. The method of claim 2 , wherein in the alert includes rendering a representation of the subject and the impermissible object on a screen, the representation of the impermissible object being superimposed on the representation of the subject in a position that visually approximates where on the subject the impermissible object is located.
4. The method of claim 3 , further comprising:
providing post-session processing of data acquired from the subject to create post-session data; and
feeding the post-session data into an artificial intelligence engine for future use as part of the artificial intelligence engine.
5. The method of claim 4 , wherein said determining includes:
analyzing the super image to determine whether any objects of note are present on the subject;
if an object of note is determined to be present, normalizing the super image for feeding into an artificial intelligence system;
transferring the normalized super image to an artificial intelligence system for pattern matching against known impermissible objects; and
calculating, based on the normalized super image and on artificial intelligence data stored in the artificial intelligence system, the likelihood that the subject is carrying an impermissible object.
6. The method of claim 5 , wherein said calculating includes performing an image search to match a detected shape against a prebuilt local image threat library.
7. The method of claim 6 , wherein said analyzing is based on policies that are remotely generated and transmitted to the apparatus.
8. The method of claim 1 , wherein the coherent radar system on a single chip further comprises a radar lens configured to shape a field of view of the output from the transmitter, as well as the reflected signal from the target back to the input of the receiver.
9. The method of claim 8 , wherein the coherent radar system on a single chip further comprises: a mixer electrically coupled to the phased array receiver antenna;
a band-pass active filter electrically coupled to the mixer via a low-noise amplifier configured to amplify a signal feeding the band pass active filter; and
a variable gain amplifier configured to receive an electrical signal from the band pass active filter.
10. The method of claim 9 , wherein the mixer is configured to create coherently related sum and difference frequencies based on the received signal and a reference signal provided by the transmitter.
11. The method of claim 10 , further comprising:
processing instructions to provide at least one of the following set of functions: an alert to a user indicating a detection of an object, or the result of a match between a detected object and an object stored in a database.
12. The method of claim 11 , further comprising:
processing instructions, at a processor, to perform at least one of the following set of functions: rendering an image, displaying an image, initiating a scan, or processing the results of the scan.
13. The method of claim 12 , further comprising:
receiving, at a processor, user inputs to manage the coherent radar system.