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Sensors 2014, 14(12), 23822-23842; doi:10.3390/s141223822

A Digital Sensor Simulator of the Pushbroom Offner Hyperspectral Imaging Spectrometer

Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, School of Instrument Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China
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Received: 30 October 2014 / Revised: 28 November 2014 / Accepted: 3 December 2014 / Published: 11 December 2014
(This article belongs to the Section Remote Sensors)
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Abstract

Sensor simulators can be used in forecasting the imaging quality of a new hyperspectral imaging spectrometer, and generating simulated data for the development and validation of the data processing algorithms. This paper presents a novel digital sensor simulator for the pushbroom Offner hyperspectral imaging spectrometer, which is widely used in the hyperspectral remote sensing. Based on the imaging process, the sensor simulator consists of a spatial response module, a spectral response module, and a radiometric response module. In order to enhance the simulation accuracy, spatial interpolation-resampling, which is implemented before the spatial degradation, is developed to compromise the direction error and the extra aliasing effect. Instead of using the spectral response function (SRF), the dispersive imaging characteristics of the Offner convex grating optical system is accurately modeled by its configuration parameters. The non-uniformity characteristics, such as keystone and smile effects, are simulated in the corresponding modules. In this work, the spatial, spectral and radiometric calibration processes are simulated to provide the parameters of modulation transfer function (MTF), SRF and radiometric calibration parameters of the sensor simulator. Some uncertainty factors (the stability, band width of the monochromator for the spectral calibration, and the integrating sphere uncertainty for the radiometric calibration) are considered in the simulation of the calibration process. With the calibration parameters, several experiments were designed to validate the spatial, spectral and radiometric response of the sensor simulator, respectively. The experiment results indicate that the sensor simulator is valid. View Full-Text
Keywords: hyperspectral; sensor simulator; Offner hyperspectral; sensor simulator; Offner
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tao, D.; Jia, G.; Yuan, Y.; Zhao, H. A Digital Sensor Simulator of the Pushbroom Offner Hyperspectral Imaging Spectrometer. Sensors 2014, 14, 23822-23842.

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