Radar and angle adjusting device

Abstract

The invention provides a radar and an angle adjusting device. The angle adjusting device comprises a first annular spherical mirror and a second annular spherical mirror which are stacked in sequence;the curvature radiuses of the first annular spherical mirror and the second annular spherical mirror are the same; the inner surfaces of the first annular spherical mirror and the second annular spherical mirror are spherical surfaces; an initial light beam can enter a cavity of the first annular spherical mirror through a light through hole in the side wall of the first annular spherical mirror,is reflected once on the inner surface of the second annular spherical mirror after being reflected for N-1 times on the inner surface of the first annular spherical mirror, then is reflected once ona reflector in the cavity of the second annular spherical mirror after being reflected for N-2 times on the outer surface of the second annular spherical mirror, and is emitted from an outlet of thefirst annular spherical mirror or the second annular spherical mirror. According to the geometrical optics principle, the field angle range of the emitted initial light beam is larger than that of theincident initial light beam, so that the field angle range can be expanded; and when the angle adjusting device is applied to a radar, the field angle range of the radar can be expanded.

Description

technical field [0001] The invention relates to the field of optics, in particular to a radar and an angle adjustment device. Background technique [0002] Radar is a device used for distance measurement. Specifically, the initial signal emitted by the radar is reflected by the object to form an echo signal, and the echo signal is compared with the initial signal to obtain accurate information on the distance between the measured object and the radar. Among them, the initial signal can be a laser signal. The laser has the advantages of small beam divergence, concentrated energy, good directivity, and high repetition frequency, so that the laser radar can realize long-distance and high-precision measurement of the measured object. At present, lidar is widely used in aerospace, remote sensing detection, measurement, and intelligent driving. [0003] Typically, radars have a limited field of view. Traditional radar can use Micro-Electro-Mechanical System (MEMS) scanning to ex...

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Problems solved by technology

[0004] There are two traditional ways to expand the field of view. The first one is to expand the field of view by rotating the prism, that is, the initial beam is reflected to each field of view through a constantly rotating reflective prism. This method can achieve a 120° field of view. Field angle scanning, but the drive circuit required by the prism is large, and the macroscopic rotation of the prism device leads to poor system stability and reliability; the second method uses ordinary objective lenses and fisheye lenses to achieve a magnification limit of 150-160° However, the change of scanning magnification from the central field of view to the peripheral field of view has significant nonlinear characteristics, and the light transmission ratio also has a large difference. At the same time, the fisheye lens is a large aberration system, so the image at the peripheral field of view The difference is very significant, making the divergence angle of the peripheral field of view larger

[0005] Therefore, none of the methods for expanding the field of view mentioned above are suitable for use in radar. How to achieve a larger field of view at a lower cost is an important issue in the practical application of radar.

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