Scanning-free linear frequency modulation continuous-wave speed measurement and distance measurement laser three-dimensional imaging method and device

Abstract

The invention discloses a scanning-free linear frequency modulation continuous-wave speed measurement and distance measurement laser three-dimensional imaging method and device. An output light beam generated by a linear frequency modulation continuous laser light source of a radar platform is divided into a local oscillation light beam and a signal light beam; the signal light beam is transmittedto a target and an echo light beam of the target is received; coherent light mixing is carried out on the echo light beam and the local oscillator light beam through a space optical bridge; a balancedetector is used for carrying out parallel balance receiving to obtain an intermediate frequency signal; the intermediate frequency signal is read out by adopting a dual-channel focal plane reading circuit; filtering processing and sampling processing are carried out to obtain sampling data; the sampling data are processed by using a field programmable gate array to realize parallel synchronous measurement of a target distance and a target speed; and then three-dimensional images are constructed respectively by combining an image processor. Therefore, a distance-intensity image containing long-distance target gray information and a spatial three-dimensional geometric position relationship can be obtained and the magnitude and direction of the relative movement radial speed of the radar platform and the target can be obtained at the same time.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a scanning-free linear frequency modulation continuous wave speed measuring and ranging laser three-dimensional imaging method and device 。 Background technique [0002] Laser three-dimensional imaging radar is an active detection technology that can accurately and quickly obtain target three-dimensional space information. It has high imaging spatial resolution and strong adaptability to target characteristics and use environments. With unique technical advantages in measurement, it is an important means for mobile platforms (including vehicle, airborne and spaceborne, etc.) to quickly obtain high-resolution three-dimensional target image information. [0003] According to the imaging method, 3D imaging lidar can be divided into scanning type and non-scanning type. Scanning 3D imaging lidar uses unit or line array detectors to obtain the height information of each point in ...

AI Technical Summary

Problems solved by technology

However, the application of coherent detection technology to long-distance target scanning-free 3D imaging has not been reported so far.

In addition, all current non-scanning laser three-dimensional imaging radars, including phase detection, polarization modulation, gain modulation, and stripe tube detectors, cannot directly measure the target velocity.

Images