5 results about "Refraction coefficient" patented technology

The invention discloses a water area change whole process identification method and system based on a remote sensing image, and relates to the technical field of remote sensing monitoring, and the method comprises the steps: collecting a water area image through a multi-source remote sensing device, obtaining a water body reflection spectrum signal, and extracting water quality spectrum characteristic information and wave band parameters; identifying pollution polarization characteristic parameters in the water body reflection spectrum; based on the pollution gradient of the intersection of the main stream and the branch stream of the water area, pollutant scattering characteristic parameters are extracted; introducing wave band parameters as adjusting variables, determining wave band dependence terms, evaluating the pollution change degree of each monitoring section according to the corrected water body spectral refractive index, and generating a water area pollution change thermodynamic diagram. The technical problem that the water area pollution monitoring precision is insufficient due to the fact that an existing water quality monitoring method cannot effectively recognize the dynamic change of the complex water area is solved, and the technical effect of improving the water area pollution monitoring precision and efficiency through high-precision recognition and dynamic monitoring of the complex water area pollution characteristics is achieved.

The invention provides an underwater environment three-dimensional reconstruction pixel point mapping relation construction method and a reconstruction method. The method comprises the following steps: acquiring parameters of a physical camera, a refraction coefficient of water in a reconstruction water area, a distance between the physical camera and the inner surface of a visual light-transmitting plate, the thickness of the visual light-transmitting plate and a refraction coefficient of the visual light-transmitting plate; obtaining a virtual pixel point position of the imaging plane of the virtual camera; analyzing to obtain a virtual object point position Pw; calculating a refracted light path after the virtual object point passes through the visible light-transmitting plate; calculating the physical pixel point position Pp of each virtual object point on the imaging plane of the physical camera according to the parameters of the physical camera and the refraction path; and establishing a mapping relation table according to the corresponding relation between the virtual pixel point position {Pv} and the physical pixel point position {Pp}. By calculating the position relation between the physical pixel points on the physical camera and the virtual pixel points on the virtual camera, the position relation of each pixel is established into a mapping relation table, so that the image of the physical camera can be corrected underwater in real time, and the distortion of the image is eliminated.

The invention discloses a shipborne marine atmospheric boundary layer refractive index profile detection system and method, and relates to the technical field of marine atmospheric environment monitoring and electromagnetic wave propagation safeguard.The method comprises the steps that sea-air downlink infrared radiation spectrum data and sea surface air temperature, relative humidity and air pressure data are obtained; constructing a background atmosphere profile by using the reanalysis data, and correcting an initial profile bottom layer by using sea surface observation air temperature, relative humidity and air pressure data to form a prior state vector; constructing an inversion cost function including an observation residual term, a background prior term and a sea surface boundary constraint term, and performing inversion to obtain an atmospheric temperature profile and a relative humidity profile; and calculating an atmospheric refractive index profile according to the temperature profile, the relative humidity profile and the air pressure profile. According to the method, the marine atmospheric refractive index profile can be continuously obtained under the shipborne dynamic observation condition, and reliable data support is provided for marine electromagnetic propagation environment analysis and waveguide diagnosis.

The application discloses a shipborne marine atmospheric boundary layer refractive index profile detection system and method, relates to the technical field of marine atmospheric environment monitoring and electromagnetic wave propagation guarantee, and comprises the following steps: acquiring sea-air downward infrared radiation spectrum data and sea surface air temperature, relative humidity and air pressure data; constructing a background atmospheric profile by using reanalysis data, and correcting the initial profile bottom layer by using the sea surface observation air temperature, relative humidity and air pressure data to form a prior state vector; constructing an inversion cost function containing an observation residual term, a background prior term and a sea surface boundary constraint term, and inverting to obtain an atmospheric temperature profile and a relative humidity profile; and calculating an atmospheric refractive index profile according to the temperature profile, the relative humidity profile and the air pressure profile. The application can continuously acquire the marine atmospheric refractive index profile under the shipborne dynamic observation condition, and provides reliable data support for marine electromagnetic propagation environment analysis and waveguide diagnosis.

The invention discloses a sea radar rapid display drawing method based on critical refraction coordinate transformation. According to the method, the current atmospheric refractive index gradient is assumed to be the negative reciprocal of the earth radius, at the moment, electromagnetic waves of a sea radar are propagated towards the sea, coordinate transformation in a Cartesian coordinate system is utilized, and forward and reverse calculation analytical expressions of the spatial position of a sea target are deduced; and a rapid display drawing method of the radar video data is established so as to realize error reduction of a sea surface target space display position. The method improves the positioning precision and the drawing rendering precision, and can be applied to the fields of sea target position calculation, multi-radar joint detection and data fusion.