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196 results about "Distance to target" patented technology

For most people it’s 20 yards. Once you find your 20-yard point, you can judge the distance from there to the target, or work in 20-yard increments until reaching the target.

Imaging millimeter wave radar system

An imaging millimeter wave radar system. The system includes a millimeter wave transmitter transmitting a frequency scanned millimeter beam that is narrow in the scanned direction and wide in a direction perpendicular to the scanned direction. The system includes a receive antenna and a Rotman type lens for forming a one-dimensional image in the perpendicular direction of targets in the antennas field of view based on millimeter wave radiation reflected from the targets. A computer creates a two dimensional image based on the scanning direction of the transmit beam of the transmit antenna and the one dimensional image from the receive antenna. Distance to the target is determined based on difference in frequency of the transmit signal and the receive signal. Thus, a three dimensional view of the systems field of view is determined by the system. This view can be displayed on a monitor using color to represent target distance. In a preferred embodiment the scanned direction is the vertical direction and the receive antenna forms a horizontal image from signals reflected from targets in the field of view. In this preferred embodiment the transmit antenna is a variable frequency millimeter wave single channel wave guide antenna operating in the 78 GHz to 81 Ghz spectral range to produce a scanning range of 10 degrees and a scanning rate of 60 Hz. The receive antenna is a multi-channel (176 channels) strip-line antenna also operating in the 78 GHz to 81 GHz spectral range, which with the Rotman lens, provides 192 horizontal pixel resolution.
Owner:TREX ENTERPRISES CORP

Hand-held device and method for detecting concealed weapons and hidden objects

The present invention is an inexpensive, hand-held, and easy to operate millimeter-wave detection device that employs a non-imaging sensor which radiates a pulse of millimeter waves of a certain amplitude and frequency towards a target located at a distance from the detection device. The sensor receives pulses of millimeter waves that are reflected from the target and generates a voltage waveform that is characteristic mainly of the target material, while other parameters such as distance to the target are known. The processor of the detection device measures both the peak voltage and the rate of increase of the voltage until it reaches the maximum. Using an algorithm stored in a software module, the deviation between the rate of the voltage rise and the peak voltage is compared with values of similar parameters for a number of test targets made of different materials that were previously collected and stored in a calibration table in the memory of the device. A concealed object, e.g. a weapon, is positively identified when the measured voltage rise is found to be similar to one of the stored voltage rises. The circuitry of the detection device generates a visual and / or audio output to a display device which is indicative to the operator as to whether a concealed object is present and, if a match is found with the data in the calibration table, the nature of the concealed object is also displayed. In addition to the basic mode of operation described, various other operation modes can be employed with the detection device of the invention.
Owner:ARIEL UNIV RES & DEV
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