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Imaging system and imaging method for stellar field of computer simulated star sensors

An imaging system and a technology for simulating stars, applied in the field of astronomical navigation, can solve the problems of heavy program design workload, complicated calculation process, failure to consider the influence of optical system, etc., achieve a friendly human-computer interaction interface, save engineering cost and time, The effect of saving programming workload

Inactive Publication Date: 2013-01-02
CHANGZHOU INST OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in 2000, the star sensor star image simulation system reported in Volume 8, Issue 3 of "Optical Precision Engineering" of Changchun Institute of Optics and Machinery, this system has the function of simulating the basic imaging environment, and the obtained digital star map is used for star map recognition algorithm research , but failed to consider the actual imaging process of the optical system and the influence of aberrations on image quality
In 2009, at the "9th International Conference on Dgital Object Identifier", Beihang University reported a method of using ray tracing to generate a simulated star map of the starry sky through the optical system. When the optical surface adopts a complex surface shape, the program design work The amount is large and the calculation process is complicated

Method used

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  • Imaging system and imaging method for stellar field of computer simulated star sensors
  • Imaging system and imaging method for stellar field of computer simulated star sensors
  • Imaging system and imaging method for stellar field of computer simulated star sensors

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Embodiment 1

[0033] On the basis of the description of the embodiments, a computer-simulated imaging system for the star field of the star sensor includes: an observed star database (Observed star catalog, denoted as OSC star library), which is composed of observed stars, and the observed stars are based on star sensitivity The limiting magnitude of the instrument is screened from the original star catalog, that is, only the binary stars whose equivalent magnitude is not higher than the limiting magnitude and the stars other than the binary stars whose magnitude is not higher than the limiting magnitude are reserved; Effect magnitude m 0 The formula for calculating is: Let the two magnitudes of the binary star be m 1 and m 2 ,Right now m 0 = m 1 - 2.5 lg ( 10 m 1 ...

Embodiment 2

[0070] A kind of imaging method of computer simulation star sensor star field on the basis of embodiment 1, comprises:

[0071] (1) According to the star sensor's limit magnitude, the observed stars are selected from the original star catalog to form the observed star database, that is, only the binary stars whose equivalent magnitude is not higher than the limit magnitude, and the stars whose magnitude is not high Stars other than binary stars of limiting magnitude;

[0072] (2) Establish a user input terminal in the ZEMAX optical design software to set the optical axis orientation of the optical module in the ZEMAX optical design software;

[0073] (3) Use the module of extracting observation stars to extract observation stars in the field of view, that is, extract the observations in the database where the optical axis points to the field of view according to the field angle corresponding to the image plane detector in the optical module star; and use the module of calcula...

Embodiment 3

[0081] On the basis of Examples 1 and 2, the specific settings of the digital star map are generated, and the digital star map is compared with the actual star map.

[0082] Set the ideal optical system in the ZEMAX optical design software, take the field of view as 20°×20°, the aperture as 27.3mm, and the focal length as 43.56mm. The parameters of each surface of the optical system are shown in Table 1, and the defocus of the image plane is 0.07mm , at this time the circle with a radius of 1.5 pixels contains 90% of the energy of the star image. And set the limit star magnitude as 5.2, and the detector pixel number as 1024×1024.

[0083] Table 1 Ideal optical system parameters (in mm)

[0084] Surface type Radius Thickness Semi-diameter OBJ Standard Infinity Infinity Infinity STOP Standard Infinity 43.56 13.65 3 Paraaxial Infinity 43.56 21.33 4 Standard Infinity 0.07 7.6808 IMAG Standard Inf...

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Abstract

The invention relates to an imaging system for a stellar field of computer simulated star sensors. The imaging system comprises an observation star database, a user input end and an extension module. The user input end is created in optical design software ZEMAX and is applicable to setting the direction of an optical axis of an optical module in the optical design software ZEMAX and the quantity and sizes of pixels of an image surface detector. The extension module is applicable to calling the optical design software ZEMAX and comprises an observation star extracting module, a visual field position computing module and a pixel gray scale computing module. The optical design software ZEMAX further comprises a ray tracing module, and the pixel gray scale computing module outputs a digital star chart according to the set quantity and the set sizes of the pixels of the image surface detector and a received energy value. By the imaging system, star chart data matched with the detector can be obtained, image surface data are sampled and quantified by the pixel gray scale computing module according to the sizes and the quantity of the pixels, the sizes and the quantity of the pixels are inputted by a user, the brightness of each pixel is computed, and the digital star chart matched with the detector can be outputted.

Description

technical field [0001] The invention belongs to the technical field of celestial navigation, and relates to an imaging system and an imaging method which use a computer to simulate a star sensor to obtain a digital star map. Background technique [0002] The star sensor is one of the most accurate attitude measurement instruments at present, and has become a research hotspot in the field of space navigation. In the process of star sensor research, a large number of star maps are needed to verify and evaluate the feasibility and performance of related technologies, which are used for program development, debugging, performance evaluation and prototype ground test. The invention researches the computer simulation star field imaging method, proposes a method based on the existing optical design system platform to carry out the computer simulation star sensor star field imaging, obtains the digital star map, and establishes a corresponding simulation system. [0003] Abroad beg...

Claims

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Application Information

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IPC IPC(8): G01C25/00G01C21/02
Inventor 吴峰朱锡芳沈为民
Owner CHANGZHOU INST OF TECH
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