A layout structure and method suitable for passive millimeter wave human body security detector

Abstract

The invention discloses a sparse array optimization layout method suitable for a passive millimeter wave human body security detector. The layout uses a waveguide horn antenna as a unit antenna, and the position and the size of the unit antenna are optimized to ensure that the imaging range and the beam efficiency when the sparse array is imaged meet the practical use requirements of the passive millimeter wave human body security detector. The invention is mainly used for solving the problem that the temperature sensitivity of the current sparse array imaging is insufficient, In this paper, anew method is proposed to improve the total receiving area of sparse array and ensure the baseline integrity of sparse array by using multiple horn antennas. This method can achieve high beam focusing efficiency with guaranteed imaging range and spatial resolution.

Description

technical field [0001] The invention relates to a sparse array layout, in particular to a sparse array optimized layout structure and a design method suitable for a passive millimeter wave human body security inspection instrument, which can be used in an imaging system of a passive sparse array radiometer to ensure the imaging field of view and Optimize the beam efficiency of the sparse array at the spatial resolution, thereby improving the temperature sensitivity of the radiometer. Background technique [0002] The optimal layout of sparse arrays is usually the key research content involved in array radiometers. The array radiometer requires the baseline formed by the array antenna to cover the entire visibility area completely, and at the same time, it is hoped to minimize the number of unit antennas and reduce the cost of array development. Antenna arrays laid out according to this optimization principle are usually called sparse arrays, which can meet the imaging needs...

AI Technical Summary

Problems solved by technology

However, in the sparse array layout, since the element antennas are not uniformly spaced and staggered, the use of uniform-sized element antennas will reduce the effective receiving area of ​​the sparse array and reduce the total received energy of the sparse array.

In turn, it affects the sidelobe of the pattern of the sparse array beamforming, increases the beam efficiency, reduces the temperature sensitivity of the image, and increases the image noise to affect the image quality.

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