Research On Visible Hyperspectral Imaging Of Ground Sea Target

Hyperspectral technology,which is based on panchromatic imaging and multispectral technology,has played an important role in military and civil fields since its birth.In the military field,hyperspectral technology can provide more data capacity in spectral dimension than multispectral technology,and can accurately identify military targets from environmental background or camouflage.In the civil aspect,hyperspectral technology is widely used in mineral identification,agricultural management and environmental monitoring and other fields.This paper has carried out research on key technologies such as ground target optical characteristic modeling,sea surface optical characteristic modeling,composite scattering of target and background,atmospheric attenuation and atmospheric path radiation,sensor modeling,etc.in the hyperspectral imaging link of spaceborne detection of ground and sea targets.,Established a hyperspectral imaging model for spaceborne detection of ground and sea targets.Firstly,the composite scattering characteristics of the target and the environment are calculated in the target coordinate system to obtain the spectral brightness image of the target coordinate system.After the light signal passes through the atmosphere,the spectral brightness image at the entrance pupil of the satellite is obtained.Finally,after the modulation of the sensor,the hyperspectral image on the sensor is obtained.Using this model,the influencing factors of hyperspectral imaging of ground targets,sea targets,and ground and sea targets are studied respectively.Two types of ground models,namely,undulating grassland and grassland road composite,were built.Combined with the solar irradiance data and the sky background radiation data of Motran,the ground scene was established.The cube was used as a simple structural target and the ground model for imaging simulation,and the hyperspectral radiance simulation image was obtained.The spectral radiance information was obtained by taking the reference point in the image,and the influence of the dihedral Angle structure formed by the cube and the ground on the target recognition was analyzed according to the spectral information of the reference point.Taking trucks and tanks as complex targets and undulating ground as ground background,the hyperspectral imaging simulation of complex targets and ground scenes was carried out,and the influence of target types,ground materials,observation zenith angle and solar angle on the imaging was analyzed.Based on Elfouhaily wave spectrum and linear filtering method,sea surface models with wind speed of 2m/s,4m/s and 6m/s are established respectively,and the influence of wind speed variation on sea surface spectral characteristics and imaging simulation is analyzed.The ship target model was established by referring to the US cruiser,and the sea surface and ship scenes were constructed.The effects of wind speed and solar zenith angle on the hyperspectral imaging of sea surface and ship scenes were studied.First,obtain the hyperspectral brightness image in the target coordinate system on the surface,consider the influence of the atmospheric transmission process in the path from the surface to the satellite,obtain the image in the target coordinate system,and finally obtain the final hyperspectral image through the satellite sensor,and analyze In this process,the influence of spectral radiance curve changes and image changes on target recognition is discussed.According to the order of spatial resolution and spectral resolution from low to high,the hyperspectral images of the ground and truck scenes and the sea and ship scenes are obtained.The effects of spatial resolution and spectral resolution on the hyperspectral imaging quality of ground and sea targets are studied.influences.