A millimeter-wave radiometer array structure and design method suitable for near-field fast imaging
An array structure and radiometer technology, which is applied in millimeter wave imaging and microwave security remote sensing, can solve the problems of increasing side lobe level of point spread function and reducing system imaging quality, so as to reduce side lobe level and improve imaging performance Effect
Active Publication Date: 2020-05-29
BEIHANG UNIV
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[0005] The antenna array of the conventional pupil plane system radiometer system is arranged in the same plane, which is suitable for long-distance target imaging; in the application of near-field imaging, the array layout in the same plane will make the point spread function of the imaging system Increased side lobe levels reduce system imaging quality
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[0023] A millimeter-wave radiometer array structure and design method suitable for near-field fast imaging proposed by the present invention will be explained in detail below with reference to the accompanying drawings.
[0024] Such as figure 1 As shown, the composition of the present invention includes: several identical one-dimensional phased arrays 1 and one-dimensional phased array supports 3 . Each one-dimensional phased array is composed of several integrated receiver front ends 2 arranged at a certain angle. Multiple one-dimensional phased arrays are arranged at certain intervals to form a two-dimensional array. The invention can obtain lower side lobe level than conventional planar arrangement arrays in near-field imaging.
[0025] The present invention adopts following technical idea:
[0026] First, according to the near-field working distance and imaging area of the millimeter-wave radiometer system, the imaging field of view required by the radiometer system ...
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The invention discloses a millimeter-wave radiometer array structure suitable for near-field fast imaging and a design method. The structure comprises several identical one-dimensional phased arrays and a one-dimensional phased array bracket. Each one-dimensional phased array is composed of several multi-channel integrated receiver front-end modules with a certain included angle. According to theprinciple of radiometer near-field imaging, by optimizing the channel spacing of the integrated receiver front-end modules in the one-dimensional phased arrays, the included angle between the front-end modules and the overall dimension of the arrays, a required imaging range and spatial resolution index can be realized in a near field area of practical work of a millimeter-wave radiometer, and anoptimized sidelobe level can also be obtained. The millimeter-wave radiometer array structure suitable for near-field fast imaging is proposed for radiometer near-field imaging application, and has alower sidelobe level than a conventional planar array structure.
Description
technical field [0001] The invention relates to a millimeter-wave radiometer array structure and design method suitable for near-field fast imaging, and belongs to the technical fields of microwave security remote sensing and millimeter-wave imaging. Background technique [0002] A radiometer is a high-sensitivity device that receives natural radiation from objects or reflects electromagnetic waves; millimeter waves refer to electromagnetic waves with wavelengths on the order of millimeters (10mm-1mm) and corresponding frequencies between 30GHz and 300GHz; millimeter-wave radiometers refer to working Radiometers in the mmWave frequency range. The millimeter wave radiometer has the advantages of short wavelength, wide frequency band, certain penetrating ability, and no electromagnetic radiation, and is widely used in military and civilian applications. [0003] In recent years, as the situation of international anti-terrorism has become more and more serious, security checks...
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IPC IPC(8): G01V8/00
CPCG01V8/005
Inventor 苗俊刚胡岸勇
Owner BEIHANG UNIV