Portable microwave imaging system
A microwave imaging, portable technology, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problems of fixed scanning trajectory, low flexibility of equipment, and incapability of real-time imaging, etc., to increase flexibility Accuracy, cost reduction, ease of production and commercial promotion
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Embodiment 1
[0062] Embodiment 1 illustrates the specific working principle of the system. In this embodiment, the test signal is set as a broadband signal with a center frequency of 30 GHz, a bandwidth of 5 GHz, and a sampling rate of 5 MHz. Spatial layout such as figure 2 As shown in , it is assumed that the corner reflector to be measured (the object to be detected) is located at the origin of the Cartesian coordinate system, and the directions of the three axes are determined. The handheld scanner is located at any position in space, and the object to be detected must be within the effective scanning angle of the scanner, otherwise the on-off judge control system is in a standby state and stops working, so the embodiment defaults that the object to be detected is within the effective angle.
[0063] Suppose the scanner is at (x n ,y n ,z n ), the center point of the scanning angle is (x′ n ,y′ n ,z' n ), so the scan direction vector is in The effective scan angle is fixed a...
Embodiment 2
[0066] This implementation provides the specific operation mode of the portable microwave imaging system, such as image 3 shown. The test signal is set as a broadband signal with a center frequency of 62GHz, a bandwidth of 5GHz, a linear change in frequency, and a sampling rate of 5MHz. The object to be measured is a human body. The operator needs to hold the scanner and make the scanning direction face the human body. Within a scanning interval, the instantaneous position and echo signal of the scanner are obtained and transmitted to the signal processor. Wave signal coherent Fourier transformation, conical area back projection calculation operation, for the first time real-time three-dimensional image can be obtained and displayed on the monitor around the operator.
[0067] If the operator continues to scan sensitive parts such as clothes pockets or trousers pockets for a long time, the details of this part will be clearer in the 3D image of the monitor, and the contrast...
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