公开(公告)号：US11960030B2

公开(公告)日：2024-04-16

申请号：US17577266

申请日：2022-01-17

Applicant: HEFEI INSTITUTE OF PHYSICAL SCIENCE, CHINESE ACADEMY OF SCIENCES

Inventor： Dong Liu ,  Liyong Qian ,  Decheng Wu ,  Xiaojun Zhou ,  Liujun Zhong ,  Wei Wei ,  Wenju Wang ,  Yingjian Wang

IPC: G01S7/481 ,  G01S7/484 ,  G01S7/486

CPC classification number: G01S7/4817 ,  G01S7/4818 ,  G01S7/484 ,  G01S7/486

Abstract: The invention relates to the technical field of radar detection, in particular to a device for real-time detection of spectrum from airborne hyperspectral imaging LiDAR and method thereof. The device comprises a laser and a reference module; the reference module comprises a first reflecting mirror and a second reflecting mirror with a given transmittance; the first reflecting mirror and the second reflecting mirror are arranged with a focusing mirror and an optical fiber in sequence therebetween. The laser emits a laser light to the first reflecting mirror with a given transmittance, and the beam of the laser light transmitted through the first reflecting mirror after passing the focusing mirror is used as the reference beam after passing the optical fiber. The invention enables detection of the spectral line of each pulse and improves the precision of reflection spectrum of the ground object measured by the system.

公开(公告)号：US11867846B2

公开(公告)日：2024-01-09

申请号：US17577263

申请日：2022-01-17

Applicant: HEFEI INSTITUTE OF PHYSICAL SCIENCE, CHINESE ACADEMY OF SCIENCES

Inventor： Dong Liu ,  Liyong Qian ,  Decheng Wu ,  Xiaojun Zhou ,  Liujun Zhong ,  Wei Wei ,  Wenju Wang ,  Yingjian Wang

IPC: G01S7/497 ,  G01S7/481 ,  G01S17/89

CPC classification number: G01S7/497 ,  G01S7/4817 ,  G01S17/89

Abstract: The invention relates to the technical field of radar detection, in particular to a method for radiation calibration of airborne hyperspectral imaging LiDAR system. The method comprises the following steps: S1. A monochromator in a spectrum calibration system emits optical signals of different spectrum values to scan the radar system, thus to obtain the bandwidth and central wavelength of each channel in the radar system; S2. According to the return signal power PR (λ, z) in the hyperspectral LiDAR equation and the optical power PRef (λ) received by the target surface of the detector in the radar system under experimental conditions, a white diffuse reflection board is taken as the ground object target, and a ranging channel is used to measure the flying height of the radar system, thus to obtain the parameters in the return signal power PR (λ, z) and the reflection spectrum βG (λ).