Interference type spectral imager simulating method

Abstract

The invention relates to an interference type spectral imager simulating method. The method comprises the following steps of: (1) carrying out spatial modulation on the entrance amplitude brightness of a spectral imager to enter a front lens to image and simulate; (2) interference spectrum imaging and simulating; (3) a detector responding and simulating; (4) modulating transfer function simulating; (5) system random noise simulating; (5) detector noise simulating; (7) carrying out spectrum restoration to convert the interference information into spectrum information. The invention has high simulation degree, and can be widely applied.

Description

technical field [0001] The invention relates to the technical field of instrument simulation, in particular to a simulation method for an interference type spectral imager. Background technique [0002] Instrument simulation technology is to simulate various working modes and working states of real instruments by establishing mathematical models, so that people can more accurately understand the possible results and existence of the instrument under certain working environments and conditions before using the real instrument. problems, so as to measure the performance of real instruments, discover potential design defects of instruments, further guide the design of instruments, and improve the functions of instruments. This technology plays a particularly important role in the design, development and application of aerospace remote sensing instruments. [0003] With the emergence of spectral imaging technology in the 1980s, optical remote sensing entered the stage of hypersp...

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Problems solved by technology

[0004] In view of the refined identification requirements of space remote sensing for target characteristics, the spectral imaging technology of dispersion mode is widely used at present. Since its spectral resolution is inversely proportional to the width of the incident slit, in order to obtain higher spectral resolution, it is necessary to continuously reduce the The width of the slit is small, so there are principle defects such as low energy utilization rate, which is greatly limited in terms of spatial resolution, spectral resolution, and weak signal detection ability, which cannot meet the above requirements. Interferometric spectral imaging technology It has the advantages of high sensitivity, high spectral resolution and high energy passing force, and is advanced in principle. In recent years, it has been widely concerned and respected by countries all over the world. It is currently a research hotspot in the application of space-to-earth remote sensing technology.

[0005] At present, the research on the simulation method of interferometric spectral imager has just started in my country. Based on the principle of spatially modulated interferometric spectral imaging technology, Zhou Jinsong et al. proposed a preliminary scheme for the simulation technology of spatially modulated interferometric hyperspectral imager (Zhou Jinsong, Hu Liang, Cui Yan, etc. , Preliminary study on simulation technology of spatially modulated interferometric spectroscopic imager, Journal of Atmospheric and Environmental Optics, 2007, 2(6): 493-498; Hu Liang, Huang Min, Zhou Jinsong, Simulation research on target detection by interferometric spectrometer, Computer Simulation, 2008 , 25(6): 288~325), but the simulation degree of this scheme is low, and the main defects are as follows:

[0006] 1. Only the random noise of the detector is considered, and the response noise of the detector itself is not considered, and the response noise of the detector itself has a much greater impact on the data than random noise;

[0007] 2. Only the change of the response characteristic of the interferometric dimension is considered, and the change of the response characteristic of the spatial dimension is not considered, while the spatially modulated interferometric spectroscopic imager simultaneously acquires the data of the interferometric dimension and the spatial dimension;

[0008] 3. Spectral restoration is not considered, and the position of spectral restoration in the simulation process is very important. Without spectral restoration, the obtained interference data cannot be directly used by users, and the evaluation of simulation results will be biased.

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