Radiometer geometric correction method for near space aerostat

Abstract

The invention provides a radiance meter geometric correction method for a near space aerostat. The radiance meter geometric correction method comprises the following steps: acquiring spectral reflectance of different ground objects in a test area and spectral radiance of the earth surface; calculating the spatial position corresponding to the beam of the radiance meter according to the relative position offset and rotation geometrical relationship of the radiance meter and the integrated navigation measurement system; calculating a space positioning error of the radiance meter; determining a matching range of ground objects in the test area according to the spatial position and the spatial positioning error; matching the spectral reflectance of different ground features in the test area with the spectral radiance of the earth surface in the matching range to obtain a ground view field coordinate corresponding to the spectral reflectance of the ground feature with the highest matching degree with the spectral radiance of the earth surface; calculating a directional angle error of the radiance meter on the near space aerostat by taking the ground view field coordinate corresponding to the highest matching degree as a geometric control point; and carrying out geometric correction on the radiance meter according to the directional angle error.

Description

technical field [0001] The invention relates to the technical field of aerospace remote sensing, in particular to a method for geometric correction of a radiometer for a near-space aerostat. Background technique [0002] Due to space radiation and the aging of components, the authenticity and accuracy of remote sensing data will be greatly affected. It is an important way to ensure the observation accuracy and consistency of different aerospace remote sensing payloads to trace the on-board observations of satellite platforms to existing benchmarks. The existing technology has proposed a variety of space radiation benchmark research plans. The main method is to move the radiation benchmark to the space satellite platform to form a "calibration star", and use the ground target benchmark data obtained from the "calibration star" to perform on-orbit determination of other satellites. mark. However, the method of radiometric calibration using "calibration satellites" has disadv...

AI Technical Summary

Problems solved by technology

However, the method of radiometric calibration using "calibration star" has the disadvantages of being difficult to synchronize with other satellites and difficult to eliminate the uniformity of the underlying surface of the actual ground objects, disturbance of the atmospheric environment, and space-time matching errors.

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