System imaging method of synthetic aperture projection radiation and synthetic aperture projection radiometer

Abstract

The invention discloses a system imaging method of a synthetic aperture projection radiation and a synthetic aperture projection radiometer. According to the method, a one-dimensional linear sparse array is used as a detection array of a radiometer and the array is fixed on a circumferential scanning platform to carry out rotation scanning on a target scene according to a fixed stepping angle, thereby realizing rotation detection on a e 1D projection image of a two-dimensional scene; the detected 1D projection image is arranged according to an array detection angle to form an angle-azimuth map; and then on the basis of a cosine matching algorithm, a brightness temperature image of the target scene is extracted from the angle-azimuth map. Besides, the synthetic aperture projection radiometer is used for realizing the method. Therefore, the high-precision two-dimensional synthetic aperture imaging is realized by using a few of antenna array elements, so that the cost and structural complexity of the synthetic aperture radiometer system are reduced and the practical application scene of the synthetic aperture radiometer is extended substantially.

Description

technical field [0001] The invention relates to a systematic imaging method of synthetic aperture projection radiation and a synthetic aperture projection radiometer, belonging to the technical field of millimeter wave near-field imaging. Background technique [0002] Millimeter-wave Synthetic Aperture Imaging Radiometer (SAIR) is a detector capable of high-resolution observations in different fields. Through aperture synthesis technology, SAIR can use small-aperture antennas to form large-aperture synthetic antennas to achieve high-resolution observations. The visibility function (cross-correlation function) of the scene is measured through the complex correlation operation between array elements, and the high temperature distribution image of the target scene is inverted. Compared with the traditional real-aperture imaging technology, the comprehensive aperture imaging technology has higher spatial resolution and better real-time performance, and can realize high-resoluti...

AI Technical Summary

Problems solved by technology

However, millimeter-wave synthetic aperture imaging radiometers with large synthetic apertures usually require many array element antennas and receivers, and the hardware cost and structural complexity of the system are high, which seriously affects the practical application of synthetic aperture imaging systems and limits Further improvement in spatial resolution

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