Measured-landform-feature-based real-time adaptive adjusting method and apparatus for airborne laser radar parameters

Abstract

The invention relates to a measured-landform-feature-based real-time adaptive adjusting method and apparatus for airborne laser radar parameters. A plane flies straightly at a constant speed with the altitude unchanged. When an elevation and a two-dimensional space frequency of a measured landform change, optimal computation is carried out to adjust setting values of a scanning field angle, a pulse repetition frequency, and a scanning frequency in real time, so that the laser scanning point cloud bandwidth is unchanged; meanwhile, the point cloud density meets the sampling theorem requirement all the time, thereby eliminating difficulty of distortion and data storage and processing for three-dimensional landform model reconstruction. Flight parameters and measured landform features are measured in real time by a laser scanner, a plane flight speed measurement instrument, and an aerial camera; with integrated computation, an elevation change and a two-dimensional space frequency of the landform are obtained; and then optimal computation is carried out to obtain optimal adjustment values of the three parameters including the pulse repetition frequency, the scanning frequency, and the scanning field angle of the laser scanner and real-time adjustment is carried out, thereby realizing real-time adaptive optimal measurement based on the measured-landform change.

Description

technical field [0001] The invention relates to the optimization design and real-time self-adaptive adjustment method of the working parameters of the airborne laser radar according to the characteristics of the terrain to be measured. Background technique [0002] Airborne lidar 3D imaging technology is a new technology in the field of terrain surveying and mapping. It can generate a digital surface model of the measured terrain, with the purpose of reproducing the real measured terrain without distortion. [0003] The measured terrain can be regarded as an elevation function on a two-dimensional plane, so the scanning measurement process of the airborne lidar on the measured ground is equivalent to a two-dimensional discrete sampling process. [0004] According to the two-dimensional sampling theorem in the reference (DigitalSignalandImageProcessing. Translation Edition / (US) Tamalbose. Wu Zhenyang, Zhou Lin et al. Translated. Digital Signal and Image Processing. Higher Edu...

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Problems solved by technology

[0013] Aiming at the lack of methods and devices for real-time adaptive adjustment of airborne laser radar parameters according to the characteristics of terrain changes in the existing airborne laser radar measurement technology, the present invention provides an airborne laser scanning parameter based on the measured terrain characteristics The method and device for real-time self-adaptive adjustment, the purpose of which is to change the three parameter values ​​of the airborne laser radar in real time, such as the scanning field of view, scanning frequency and pulse repetition frequency, when the measured terrain characteristics change, so that the laser scanning The point cloud distribution and density reach the optimal state

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